| BCBS Prefix List 2024 - Alpha | State Lookup | BCBS Company |
|---|---|---|
| CAA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CAB | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CAC | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CAD | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CAE | New York | Empire Blue-Cross Blue-Shield of New York |
| CAF | Mississippi | Blue-Cross Blue-Shield of Mississippi |
| CAG | California | Blue-Shield of California |
| CAH | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CAI | California | Anthem Blue-Cross |
| CAJ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CAK | California | Blue-Shield of California |
| CAL | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CAM | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| CAN | Illinois | Blue-Cross Blue-Shield of Illinois |
| CAO | - | Unallocated/Not Assigned |
| CAP | Texas | Blue-Cross Blue-Shield of Texas |
| CAQ | Alaska | Premera Blue-Cross of Alaska |
| CAR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CAS | Texas | Blue-Cross Blue-Shield of Texas |
| CAT | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CAU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CAV | Alaska | Premera Blue-Cross of Alaska |
| CAW | California | Blue-Shield of California |
| CAX | California | Anthem Blue-Cross |
| CAY | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CAZ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CBA | California | Anthem Blue-Cross |
| CBB | Texas | Blue-Cross Blue-Shield of Texas |
| CBC | - | Unallocated/Not Assigned |
| CBD | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CBE | - | Unallocated/Not Assigned |
| CBF | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CBG | Alabama | Blue-Cross Blue-Shield of Alabama |
| CBH | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CBI | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CBJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CBK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CBL | - | Unallocated/Not Assigned |
| CBM | California | Anthem Blue-Cross |
| CBN | - | Unallocated/Not Assigned |
| CBO | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| CBP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CBQ | California | Anthem Blue-Cross |
| CBR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CBS | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| CBT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CBU | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| CBV | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| CBW | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CBX | - | Unallocated/Not Assigned |
| CBY | Illinois | Blue-Cross Blue-Shield of Illinois |
| CBZ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| CCA | New York | Empire Blue-Cross Blue-Shield of New York |
| CCB | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CCC | Idaho | Blue-Cross of Idaho |
| CCD | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CCE | - | Unallocated/Not Assigned |
| CCF | Illinois | Blue-Cross Blue-Shield of Illinois |
| CCG | - | Unallocated/Not Assigned |
| CCH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CCI | Michigan | Blue-Cross Blue-Shield of Michigan |
| CCJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| CCK | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CCL | Illinois | Blue-Cross Blue-Shield of Illinois |
| CCM | Texas | Blue-Cross Blue-Shield of Texas |
| CCN | - | Unallocated/Not Assigned |
| CCO | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CCP | - | Unallocated/Not Assigned |
| CCQ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CCR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CCS | - | Unallocated/Not Assigned |
| CCT | - | Unallocated/Not Assigned |
| CCU | - | Unallocated/Not Assigned |
| CCV | California | Anthem Blue-Cross |
| CCW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CCX | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CCY | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CCZ | California | Blue-Shield of California |
| CDA | Illinois | Blue-Cross Blue-Shield of Illinois |
| CDB | - | Unallocated/Not Assigned |
| CDC | Arizona | Blue-Cross Blue-Shield of Arizona |
| CDD | - | Unallocated/Not Assigned |
| CDE | - | Unallocated/Not Assigned |
| CDF | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| CDG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CDH | - | Unallocated/Not Assigned |
| CDI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CDJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CDK | New York | Empire Blue-Cross Blue-Shield of New York |
| CDL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CDM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CDN | Arkansas | Arkansas Blue-Cross Blue-Shield |
| CDO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CDP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CDQ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CDR | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CDS | New York (Northeastern) | Blue-Shield of Northeastern New York |
| CDT | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CDU | Illinois | Blue-Cross Blue-Shield of Illinois |
| CDV | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CDW | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CDX | Illinois | Blue-Cross Blue-Shield of Illinois |
| CDY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CDZ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CEA | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CEB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CEC | Illinois | Blue-Cross Blue-Shield of Illinois |
| CED | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEE | Texas | Blue-Cross Blue-Shield of Texas |
| CEF | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CEG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CEH | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CEI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CEJ | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEK | - | Unallocated/Not Assigned |
| CEL | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CEM | California | Anthem Blue-Cross |
| CEN | - | Unallocated/Not Assigned |
| CEO | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CEP | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CER | - | Unallocated/Not Assigned |
| CES | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| CET | California | Blue-Shield of California |
| CEU | - | Unallocated/Not Assigned |
| CEV | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CEX | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEY | Illinois | Blue-Cross Blue-Shield of Illinois |
| CEZ | Illinois | Blue-Cross Blue-Shield of Illinois |
| CFA | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CFB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CFC | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CFD | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CFE | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CFF | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CFG | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CFH | California | Anthem Blue-Cross |
| CFI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CFJ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CFK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CFL | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CFM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CFN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CFO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CFP | - | Unallocated/Not Assigned |
| CFQ | - | Unallocated/Not Assigned |
| CFR | Illinois | Blue-Cross Blue-Shield of Illinois |
| CFS | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| CFT | New York | Empire Blue-Cross Blue-Shield of New York |
| CFU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CFV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CFW | - | Unallocated/Not Assigned |
| CFX | Alaska | Premera Blue-Cross of Alaska |
| CFY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CFZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CGA | California | Anthem Blue-Cross |
| CGB | California | Blue-Shield of California |
| CGC | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CGD | California | Blue-Shield of California |
| CGE | Texas | Blue-Cross Blue-Shield of Texas |
| CGF | Arizona | Blue-Cross Blue-Shield of Arizona |
| CGG | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| CGH | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CGI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CGJ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CGK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CGL | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CGM | - | Unallocated/Not Assigned |
| CGN | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CGO | Illinois | Blue-Cross Blue-Shield of Illinois |
| CGP | New York | Excellus Blue-Cross Blue-Shield of New York |
| CGQ | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CGR | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CGS | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CGT | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CGU | - | Unallocated/Not Assigned |
| CGV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CGW | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CGX | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CGY | Florida | Florida-Blue |
| CGZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CHA | Alabama | Blue-Cross Blue-Shield of Alabama |
| CHB | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CHC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CHD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CHE | - | Unallocated/Not Assigned |
| CHF | Texas | Blue-Cross Blue-Shield of Texas |
| CHG | Illinois | Blue-Cross Blue-Shield of Illinois |
| CHH | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CHI | - | Unallocated/Not Assigned |
| CHJ | - | Unallocated/Not Assigned |
| CHK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CHL | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CHM | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CHN | - | Unallocated/Not Assigned |
| CHO | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| CHP | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CHQ | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| CHR | Illinois | Blue-Cross Blue-Shield of Illinois |
| CHS | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CHT | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CHU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CHV | Illinois | Blue-Cross Blue-Shield of Illinois |
| CHW | - | Unallocated/Not Assigned |
| CHX | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CHY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CHZ | - | Unallocated/Not Assigned |
| CIA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CIB | Illinois | Blue-Cross Blue-Shield of Illinois |
| CIC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CID | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CIE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CIF | Illinois | Blue-Cross Blue-Shield of Illinois |
| CIG | - | Unallocated/Not Assigned |
| CIH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CII | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CIJ | Idaho | Blue-Cross of Idaho |
| CIK | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CIL | - | Unallocated/Not Assigned |
| CIM | - | Unallocated/Not Assigned |
| CIN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CIO | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CIP | Alabama | Blue-Cross Blue-Shield of Alabama |
| CIQ | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CIR | Alaska | Premera Blue-Cross of Alaska |
| CIS | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CIT | Florida | Florida-Blue |
| CIU | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CIV | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CIW | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CIX | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CIY | Florida | Florida-Blue |
| CIZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CJA | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CJB | Illinois | Blue-Cross Blue-Shield of Illinois |
| CJC | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CJD | - | Unallocated/Not Assigned |
| CJE | New York | Empire Blue-Cross Blue-Shield of New York |
| CJF | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CJG | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| CJH | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CJI | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| CJJ | Alaska | Premera Blue-Cross of Alaska |
| CJK | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CJL | New York | Empire Blue-Cross Blue-Shield of New York |
| CJM | Florida | Florida-Blue |
| CJN | Florida | Florida-Blue |
| CJO | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CJP | - | Unallocated/Not Assigned |
| CJQ | Idaho | Blue-Cross of Idaho |
| CJR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CJS | Illinois | Blue-Cross Blue-Shield of Illinois |
| CJT | Texas | Blue-Cross Blue-Shield of Texas |
| CJU | Illinois | Blue-Cross Blue-Shield of Illinois |
| CJV | New York | Empire Blue-Cross Blue-Shield of New York |
| CJW | - | Unallocated/Not Assigned |
| CJX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CJY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CJZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CKA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CKB | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CKC | - | Unallocated/Not Assigned |
| CKD | - | Unallocated/Not Assigned |
| CKE | California | Blue-Shield of California |
| CKF | - | Unallocated/Not Assigned |
| CKG | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CKH | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CKI | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CKJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CKK | - | Unallocated/Not Assigned |
| CKL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CKM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CKN | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CKO | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CKP | Texas | Blue-Cross Blue-Shield of Texas |
| CKQ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CKR | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CKS | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CKT | - | Unallocated/Not Assigned |
| CKU | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CKV | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CKW | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CKX | California | Blue-Shield of California |
| CKY | California | Blue-Shield of California |
| CKZ | - | Unallocated/Not Assigned |
| CLA | - | Unallocated/Not Assigned |
| CLB | Illinois | Blue-Cross Blue-Shield of Illinois |
| CLC | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CLD | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CLE | Texas | Blue-Cross Blue-Shield of Texas |
| CLF | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CLG | - | Unallocated/Not Assigned |
| CLH | New York | Excellus Blue-Cross Blue-Shield of New York |
| CLI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CLJ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CLK | - | Unallocated/Not Assigned |
| CLL | California | Anthem Blue-Cross |
| CLM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CLN | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CLO | Mississippi | Blue-Cross Blue-Shield of Mississippi |
| CLP | - | Unallocated/Not Assigned |
| CLQ | - | Unallocated/Not Assigned |
| CLR | Alaska | Premera Blue-Cross of Alaska |
| CLS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CLT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CLU | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CLV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CLW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CLX | - | Unallocated/Not Assigned |
| CLY | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CLZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CMA | Michigan | Blue-Cross Blue-Shield of Michigan |
| CMB | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CMC | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CMD | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CME | Illinois | Blue-Cross Blue-Shield of Illinois |
| CMF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CMG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CMH | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CMI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CMJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CMK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CML | - | Unallocated/Not Assigned |
| CMM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CMN | New York (Northeastern) | Blue-Shield of Northeastern New York |
| CMO | - | Unallocated/Not Assigned |
| CMP | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CMQ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CMR | Illinois | Blue-Cross Blue-Shield of Illinois |
| CMS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CMT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CMU | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CMV | California | Blue-Shield of California |
| CMW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CMX | New York | Excellus Blue-Cross Blue-Shield of New York |
| CMY | Idaho | Blue-Cross of Idaho |
| CMZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CNA | - | Unallocated/Not Assigned |
| CNB | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CNC | Texas | Blue-Cross Blue-Shield of Texas |
| CND | - | Unallocated/Not Assigned |
| CNE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CNF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CNG | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CNH | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CNI | Texas | Blue-Cross Blue-Shield of Texas |
| CNJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CNK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CNL | Illinois | Blue-Cross Blue-Shield of Illinois |
| CNM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CNN | - | Unallocated/Not Assigned |
| CNO | - | Unallocated/Not Assigned |
| CNP | - | Unallocated/Not Assigned |
| CNQ | - | Unallocated/Not Assigned |
| CNR | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CNS | - | Unallocated/Not Assigned |
| CNT | Illinois | Blue-Cross Blue-Shield of Illinois |
| CNU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CNV | Illinois | Blue-Cross Blue-Shield of Illinois |
| CNW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CNX | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CNY | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CNZ | Illinois | Blue-Cross Blue-Shield of Illinois |
| COA | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| COB | Texas | Blue-Cross Blue-Shield of Texas |
| COC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| COD | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| COE | - | Unallocated/Not Assigned |
| COF | - | Unallocated/Not Assigned |
| COG | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| COH | - | Unallocated/Not Assigned |
| COI | - | Unallocated/Not Assigned |
| COJ | Alabama | Blue-Cross Blue-Shield of Alabama |
| COK | - | Unallocated/Not Assigned |
| COL | - | Unallocated/Not Assigned |
| COM | Alabama | Blue-Cross Blue-Shield of Alabama |
| CON | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| COO | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| COP | Alabama | Blue-Cross Blue-Shield of Alabama |
| COQ | - | Unallocated/Not Assigned |
| COR | - | Unallocated/Not Assigned |
| COS | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| COT | Idaho | Blue-Cross of Idaho |
| COU | - | Unallocated/Not Assigned |
| COV | Arizona | Blue-Cross Blue-Shield of Arizona |
| COW | - | Unallocated/Not Assigned |
| COX | California | Blue-Shield of California |
| COY | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| COZ | - | Unallocated/Not Assigned |
| CPA | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CPB | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CPC | Alabama | Blue-Cross Blue-Shield of Alabama |
| CPD | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CPE | Illinois | Blue-Cross Blue-Shield of Illinois |
| CPF | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CPG | New York (Northeastern) | Blue-Shield of Northeastern New York |
| CPH | Illinois | Blue-Cross Blue-Shield of Illinois |
| CPI | - | Unallocated/Not Assigned |
| CPJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CPK | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CPL | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| CPM | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CPN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CPO | - | Unallocated/Not Assigned |
| CPP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CPQ | California | Anthem Blue-Cross |
| CPR | California | Anthem Blue-Cross |
| CPS | Alabama | Blue-Cross Blue-Shield of Alabama |
| CPT | California | Anthem Blue-Cross |
| CPU | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CPV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CPW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CPX | - | Unallocated/Not Assigned |
| CPY | Illinois | Blue-Cross Blue-Shield of Illinois |
| CPZ | New York (Northeastern) | Blue-Shield of Northeastern New York |
| CQA | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CQB | California | Anthem Blue-Cross |
| CQC | - | Unallocated/Not Assigned |
| CQD | - | Unallocated/Not Assigned |
| CQE | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CQF | - | Unallocated/Not Assigned |
| CQG | - | Unallocated/Not Assigned |
| CQH | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CQI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CQJ | Texas | Blue-Cross Blue-Shield of Texas |
| CQK | California | Blue-Shield of California |
| CQL | - | Unallocated/Not Assigned |
| CQM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CQN | California | Blue-Shield of California |
| CQO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CQP | - | Unallocated/Not Assigned |
| CQQ | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CQR | - | Unallocated/Not Assigned |
| CQS | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| CQT | - | Unallocated/Not Assigned |
| CQU | - | Unallocated/Not Assigned |
| CQV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CQW | - | Unallocated/Not Assigned |
| CQX | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CQY | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CQZ | - | Unallocated/Not Assigned |
| CRA | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CRB | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CRC | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CRD | - | Unallocated/Not Assigned |
| CRE | California | Blue-Shield of California |
| CRF | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CRG | Texas | Blue-Cross Blue-Shield of Texas |
| CRH | Michigan | Blue-Cross Blue-Shield of Michigan |
| CRI | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CRJ | - | Unallocated/Not Assigned |
| CRK | Texas | Blue-Cross Blue-Shield of Texas |
| CRL | New York | Excellus Blue-Cross Blue-Shield of New York |
| CRM | Illinois | Blue-Cross Blue-Shield of Illinois |
| CRN | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CRO | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CRP | Illinois | Blue-Cross Blue-Shield of Illinois |
| CRQ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CRR | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CRS | Alaska | Premera Blue-Cross of Alaska |
| CRT | - | Unallocated/Not Assigned |
| CRU | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| CRV | - | Unallocated/Not Assigned |
| CRW | California | Anthem Blue-Cross |
| CRX | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CRY | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| CRZ | Texas | Blue-Cross Blue-Shield of Texas |
| CSA | Alabama | Blue-Cross Blue-Shield of Alabama |
| CSB | Illinois | Blue-Cross Blue-Shield of Illinois |
| CSC | Florida | Florida-Blue |
| CSD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CSE | - | Unallocated/Not Assigned |
| CSF | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CSG | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CSH | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CSI | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| CSJ | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CSK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CSL | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| CSM | Arkansas | Arkansas Blue-Cross Blue-Shield |
| CSN | - | Unallocated/Not Assigned |
| CSO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CSP | New York | Excellus Blue-Cross Blue-Shield of New York |
| CSQ | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CSR | California | Blue-Shield of California |
| CSS | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CST | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CSU | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CSV | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CSW | - | Unallocated/Not Assigned |
| CSX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CSY | - | Unallocated/Not Assigned |
| CSZ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CTA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CTB | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CTC | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| CTD | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CTE | - | Unallocated/Not Assigned |
| CTF | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CTG | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CTH | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| CTI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CTJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CTK | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| CTL | Illinois | Blue-Cross Blue-Shield of Illinois |
| CTM | Idaho | Blue-Cross of Idaho |
| CTN | - | Unallocated/Not Assigned |
| CTO | California | Blue-Shield of California |
| CTP | - | Unallocated/Not Assigned |
| CTQ | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| CTR | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CTS | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CTT | Alaska | Premera Blue-Cross of Alaska |
| CTU | California | Blue-Shield of California |
| CTV | - | Unallocated/Not Assigned |
| CTW | Alaska | Premera Blue-Cross of Alaska |
| CTX | California | Blue-Shield of California |
| CTY | Illinois | Blue-Cross Blue-Shield of Illinois |
| CTZ | Arizona | Blue-Cross Blue-Shield of Arizona |
| CUA | - | Unallocated/Not Assigned |
| CUB | New York | Excellus Blue-Cross Blue-Shield of New York |
| CUC | - | Unallocated/Not Assigned |
| CUD | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CUE | - | Unallocated/Not Assigned |
| CUF | California | Blue-Shield of California |
| CUG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CUH | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| CUI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CUJ | - | Unallocated/Not Assigned |
| CUK | Alabama | Blue-Cross Blue-Shield of Alabama |
| CUL | - | Unallocated/Not Assigned |
| CUM | - | Unallocated/Not Assigned |
| CUN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CUO | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CUP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CUQ | California | Blue-Shield of California |
| CUR | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| CUS | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CUT | Illinois | Blue-Cross Blue-Shield of Illinois |
| CUU | Texas | Blue-Cross Blue-Shield of Texas |
| CUV | Illinois | Blue-Cross Blue-Shield of Illinois |
| CUW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CUX | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CUY | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CUZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CVA | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CVB | Florida | Florida-Blue |
| CVC | Illinois | Blue-Cross Blue-Shield of Illinois |
| CVD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CVE | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CVF | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CVG | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CVH | - | Unallocated/Not Assigned |
| CVI | Alabama | Blue-Cross Blue-Shield of Alabama |
| CVJ | Florida | Florida-Blue |
| CVK | Florida | Florida-Blue |
| CVL | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CVM | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CVN | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CVO | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CVP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CVQ | - | Unallocated/Not Assigned |
| CVR | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CVS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CVT | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CVU | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CVV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CVW | - | Unallocated/Not Assigned |
| CVX | Illinois | Blue-Cross Blue-Shield of Illinois |
| CVY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CVZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CWA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CWB | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CWC | - | Unallocated/Not Assigned |
| CWD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CWE | Michigan | Blue-Cross Blue-Shield of Michigan |
| CWF | Idaho | Blue-Cross of Idaho |
| CWG | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CWH | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CWI | California | Blue-Shield of California |
| CWJ | - | Unallocated/Not Assigned |
| CWK | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CWL | - | Unallocated/Not Assigned |
| CWM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| CWN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CWO | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CWP | Texas | Blue-Cross Blue-Shield of Texas |
| CWQ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CWR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| CWS | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CWT | Texas | Blue-Cross Blue-Shield of Texas |
| CWU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CWV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CWW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CWX | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| CWY | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CWZ | New York | Empire Blue-Cross Blue-Shield of New York |
| CXA | - | Unallocated/Not Assigned |
| CXB | Idaho | Blue-Cross of Idaho |
| CXC | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| CXD | Illinois | Blue-Cross Blue-Shield of Illinois |
| CXE | - | Unallocated/Not Assigned |
| CXF | Alaska | Premera Blue-Cross of Alaska |
| CXG | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CXH | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CXI | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| CXJ | New York | Excellus Blue-Cross Blue-Shield of New York |
| CXK | Texas | Blue-Cross Blue-Shield of Texas |
| CXL | - | Unallocated/Not Assigned |
| CXM | - | Unallocated/Not Assigned |
| CXN | - | Unallocated/Not Assigned |
| CXO | Arkansas | Arkansas Blue-Cross Blue-Shield |
| CXP | Texas | Blue-Cross Blue-Shield of Texas |
| CXQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CXR | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| CXS | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CXT | Illinois | Blue-Cross Blue-Shield of Illinois |
| CXU | - | Unallocated/Not Assigned |
| CXV | - | Unallocated/Not Assigned |
| CXW | - | Unallocated/Not Assigned |
| CXX | California | Blue-Shield of California |
| CXY | - | Unallocated/Not Assigned |
| CXZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CYA | Illinois | Blue-Cross Blue-Shield of Illinois |
| CYB | California | Blue-Shield of California |
| CYC | Illinois | Blue-Cross Blue-Shield of Illinois |
| CYD | - | Unallocated/Not Assigned |
| CYE | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CYF | - | Unallocated/Not Assigned |
| CYG | Florida | Florida-Blue |
| CYH | - | Unallocated/Not Assigned |
| CYI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CYJ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CYK | Florida | Florida-Blue |
| CYL | Illinois | Blue-Cross Blue-Shield of Illinois |
| CYM | - | Unallocated/Not Assigned |
| CYN | - | Unallocated/Not Assigned |
| CYO | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| CYP | Illinois | Blue-Cross Blue-Shield of Illinois |
| CYQ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CYR | Texas | Blue-Cross Blue-Shield of Texas |
| CYS | Illinois | Blue-Cross Blue-Shield of Illinois |
| CYT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| CYU | New York | Empire Blue-Cross Blue-Shield of New York |
| CYV | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CYW | - | Unallocated/Not Assigned |
| CYX | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CYY | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CYZ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| CZA | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| CZB | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| CZC | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CZD | - | Unallocated/Not Assigned |
| CZE | Texas | Blue-Cross Blue-Shield of Texas |
| CZF | - | Unallocated/Not Assigned |
| CZG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| CZH | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CZI | California | Blue-Shield of California |
| CZJ | - | Unallocated/Not Assigned |
| CZK | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| CZL | - | Unallocated/Not Assigned |
| CZM | - | Unallocated/Not Assigned |
| CZN | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CZO | - | Unallocated/Not Assigned |
| CZP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CZQ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| CZR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| CZS | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CZT | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| CZU | California | Anthem Blue-Cross |
| CZV | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| CZW | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| CZX | - | Unallocated/Not Assigned |
| CZY | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| CZZ | - | Unallocated/Not Assigned |
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