| HAA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAC | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HAE | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HAF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HAH | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HAI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HAJ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HAK | - | Unallocated/Not Assigned |
| HAL | - | Unallocated/Not Assigned |
| HAM | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAN | - | Unallocated/Not Assigned |
| HAO | Michigan | Blue-Cross Blue-Shield of Michigan |
| HAP | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| HAQ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAR | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HAS | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HAT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HAU | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| HAV | Illinois | Blue-Cross Blue-Shield of Illinois |
| HAW | Michigan | Blue-Cross Blue-Shield of Michigan |
| HAX | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAY | - | Unallocated/Not Assigned |
| HAZ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBB | Illinois | Blue-Cross Blue-Shield of Illinois |
| HBC | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HBD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBE | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HBF | - | Unallocated/Not Assigned |
| HBG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HBH | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBI | - | Unallocated/Not Assigned |
| HBJ | Arkansas | Arkansas Blue-Cross Blue-Shield |
| HBK | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBL | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HBM | - | Unallocated/Not Assigned |
| HBN | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HBO | - | Unallocated/Not Assigned |
| HBP | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HBQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HBR | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HBS | - | Unallocated/Not Assigned |
| HBT | Texas | Blue-Cross Blue-Shield of Texas |
| HBU | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HBV | - | Unallocated/Not Assigned |
| HBW | - | Unallocated/Not Assigned |
| HBX | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBY | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBZ | Arkansas | Arkansas Blue-Cross Blue-Shield |
| HCA | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HCB | Texas | Blue-Cross Blue-Shield of Texas |
| HCC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HCD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HCE | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HCF | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HCG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HCH | - | Unallocated/Not Assigned |
| HCI | - | Unallocated/Not Assigned |
| HCJ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HCK | Idaho | Blue-Cross of Idaho |
| HCL | Illinois | Blue-Cross Blue-Shield of Illinois |
| HCM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HCN | - | Unallocated/Not Assigned |
| HCO | - | Unallocated/Not Assigned |
| HCP | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HCQ | - | Unallocated/Not Assigned |
| HCR | - | Unallocated/Not Assigned |
| HCS | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HCT BCBS Prefix | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HCU | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HCV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HCW | - | Unallocated/Not Assigned |
| HCX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HCY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HCZ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDA | - | Unallocated/Not Assigned |
| HDB | California | Anthem Blue-Cross |
| HDC | - | Unallocated/Not Assigned |
| HDD | - | Unallocated/Not Assigned |
| HDE | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HDF | Illinois | Blue-Cross Blue-Shield of Illinois |
| HDG | Mississippi | Blue-Cross Blue-Shield of Mississippi |
| HDH | - | Unallocated/Not Assigned |
| HDI | - | Unallocated/Not Assigned |
| HDJ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDK | - | Unallocated/Not Assigned |
| HDL | - | Unallocated/Not Assigned |
| HDM | - | Unallocated/Not Assigned |
| HDN | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HDO | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDP | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDR | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HDS | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDU | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HDW | California | Anthem Blue-Cross |
| HDX | Alabama | Blue-Cross Blue-Shield of Alabama |
| HDY | California | Anthem Blue-Cross |
| HDZ | California | Blue-Shield of California |
| HEA | California | Anthem Blue-Cross |
| HEB | Texas | Blue-Cross Blue-Shield of Texas |
| HEC | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HED | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEE | Illinois | Blue-Cross Blue-Shield of Illinois |
| HEF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HEH | Kansas | Blue-Cross Blue-Shield of Kansas |
| HEI | Arkansas | Arkansas Blue-Cross Blue-Shield |
| HEJ | - | Unallocated/Not Assigned |
| HEK | Michigan | Blue-Cross Blue-Shield of Michigan |
| HEL | - | Unallocated/Not Assigned |
| HEM BCBS Prefix | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HEN | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEO | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HEP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HEQ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HER | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HES | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HET | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HEU | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HEV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HEW | - | Unallocated/Not Assigned |
| HEX | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HEY | Illinois | Blue-Cross Blue-Shield of Illinois |
| HEZ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HFA | Illinois | Blue-Cross Blue-Shield of Illinois |
| HFB | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HFC | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HFD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HFE | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| HFF | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HFG | - | Unallocated/Not Assigned |
| HFH | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HFI | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HFJ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HFK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HFL | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HFM | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFN | - | Unallocated/Not Assigned |
| HFO | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HFP | Hawaii | Blue-Cross Blue-Shield of Hawaii |
| HFQ | - | Unallocated/Not Assigned |
| HFR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFS | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HFT | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HFU | - | Unallocated/Not Assigned |
| HFV | - | Unallocated/Not Assigned |
| HFW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFX | - | Unallocated/Not Assigned |
| HFY | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HFZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HGA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HGB | - | Unallocated/Not Assigned |
| HGC | - | Unallocated/Not Assigned |
| HGD | Texas | Blue-Cross Blue-Shield of Texas |
| HGE | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HGF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HGG | - | Unallocated/Not Assigned |
| HGH | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| HGI | - | Unallocated/Not Assigned |
| HGJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HGK | - | Unallocated/Not Assigned |
| HGL | - | Unallocated/Not Assigned |
| HGM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HGN | - | Unallocated/Not Assigned |
| HGO | - | Unallocated/Not Assigned |
| HGP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HGQ | Michigan | Blue-Cross Blue-Shield of Michigan |
| HGR | Alabama | Blue-Cross Blue-Shield of Alabama |
| HGS | - | Unallocated/Not Assigned |
| HGT | - | Unallocated/Not Assigned |
| HGU | - | Unallocated/Not Assigned |
| HGV | - | Unallocated/Not Assigned |
| HGW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HGX | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HGY | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HGZ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HHA | - | Unallocated/Not Assigned |
| HHB | New York | Empire Blue-Cross Blue-Shield of New York |
| HHC | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| HHD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HHE | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| HHF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HHG | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HHH | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HHI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HHJ | - | Unallocated/Not Assigned |
| HHK | Texas | Blue-Cross Blue-Shield of Texas |
| HHL | Michigan | Blue-Cross Blue-Shield of Michigan |
| HHM | Florida | Florida-Blue |
| HHN | Alabama | Blue-Cross Blue-Shield of Alabama |
| HHO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HHP | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HHQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HHR | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HHS | - | Unallocated/Not Assigned |
| HHT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HHU | Illinois | Blue-Cross Blue-Shield of Illinois |
| HHV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HHW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HHX | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| HHY | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HHZ | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HIA | - | Unallocated/Not Assigned |
| HIB | Alabama | Blue-Cross Blue-Shield of Alabama |
| HIC | - | Unallocated/Not Assigned |
| HID | California | Anthem Blue-Cross |
| HIE | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HIF | Idaho | Blue-Cross of Idaho |
| HIG | California | Blue-Shield of California |
| HIH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HII | California | Blue-Shield of California |
| HIJ | - | Unallocated/Not Assigned |
| HIK | Florida | Florida-Blue |
| HIL | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HIM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HIN | Vermont | Blue-Cross Blue-Shield of Vermont |
| HIO | Michigan | Blue-Cross Blue-Shield of Michigan |
| HIP | - | Unallocated/Not Assigned |
| HIQ | California | Blue-Shield of California |
| HIR | - | Unallocated/Not Assigned |
| HIS | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HIT | - | Unallocated/Not Assigned |
| HIU | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HIV | - | Unallocated/Not Assigned |
| HIW | - | Unallocated/Not Assigned |
| HIX | - | Unallocated/Not Assigned |
| HIY | - | Unallocated/Not Assigned |
| HIZ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HJA | - | Unallocated/Not Assigned |
| HJB | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HJC | Michigan | Blue-Cross Blue-Shield of Michigan |
| HJD | Illinois | Blue-Cross Blue-Shield of Illinois |
| HJE | - | Unallocated/Not Assigned |
| HJF | California | Anthem Blue-Cross |
| HJG | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HJH | Illinois | Blue-Cross Blue-Shield of Illinois |
| HJI | Michigan | Blue-Cross Blue-Shield of Michigan |
| HJJ | - | Unallocated/Not Assigned |
| HJK | - | Unallocated/Not Assigned |
| HJL | Illinois | Blue-Cross Blue-Shield of Illinois |
| HJM | California | Blue-Shield of California |
| HJN | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HJO | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HJP | California | Blue-Shield of California |
| HJQ | California | Blue-Shield of California |
| HJR | - | Unallocated/Not Assigned |
| HJS | - | Unallocated/Not Assigned |
| HJT | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HJU | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HJV | - | Unallocated/Not Assigned |
| HJW | New York | Empire Blue-Cross Blue-Shield of New York |
| HJX | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HJY | Michigan | Blue-Cross Blue-Shield of Michigan |
| HJZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HKA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HKB | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HKC | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HKD | Michigan | Blue-Cross Blue-Shield of Michigan |
| HKE | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HKF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HKG | - | Unallocated/Not Assigned |
| HKH | New York | Empire Blue-Cross Blue-Shield of New York |
| HKI | - | Unallocated/Not Assigned |
| HKJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HKK | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HKL | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HKM | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HKN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HKO | California | Blue-Shield of California |
| HKP | Michigan | Blue-Cross Blue-Shield of Michigan |
| HKQ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HKR | Illinois | Blue-Cross Blue-Shield of Illinois |
| HKS | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HKT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HKU | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HKV | Illinois | Blue-Cross Blue-Shield of Illinois |
| HKW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HKX | - | Unallocated/Not Assigned |
| HKY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HKZ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HLA | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HLB | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HLC | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HLD | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HLE | - | Unallocated/Not Assigned |
| HLF | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HLG | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HLH | - | Unallocated/Not Assigned |
| HLI | Idaho | Blue-Cross of Idaho |
| HLJ | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HLK | - | Unallocated/Not Assigned |
| HLL | - | Unallocated/Not Assigned |
| HLM | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HLN | Illinois | Blue-Cross Blue-Shield of Illinois |
| HLO | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HLP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HLQ | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HLR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HLS | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HLT | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HLU | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HLV | Texas | Blue-Cross Blue-Shield of Texas |
| HLW | New York | Empire Blue-Cross Blue-Shield of New York |
| HLX | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HLY | Texas | Blue-Cross Blue-Shield of Texas |
| HLZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HMA | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HMB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HMC | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HMD | Alabama | Blue-Cross Blue-Shield of Alabama |
| HME | - | Unallocated/Not Assigned |
| HMF | - | Unallocated/Not Assigned |
| HMG | - | Unallocated/Not Assigned |
| HMH | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HMI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HMJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HMK | - | Unallocated/Not Assigned |
| HML | Alabama | Blue-Cross Blue-Shield of Alabama |
| HMM | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HMN | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HMO | Arkansas | Arkansas Blue-Cross Blue-Shield |
| HMP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HMQ | - | Unallocated/Not Assigned |
| HMR | New York | Excellus Blue-Cross Blue-Shield of New York |
| HMS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HMT | New York | Empire Blue-Cross Blue-Shield of New York |
| HMU | Idaho | Blue-Cross of Idaho |
| HMV | New York | Empire Blue-Cross Blue-Shield of New York |
| HMW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HMX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HMY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HMZ | New York | Empire Blue-Cross Blue-Shield of New York |
| HNA | Alabama | Blue-Cross Blue-Shield of Alabama |
| HNB | - | Unallocated/Not Assigned |
| HNC | - | Unallocated/Not Assigned |
| HND | - | Unallocated/Not Assigned |
| HNE | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HNF | Texas | Blue-Cross Blue-Shield of Texas |
| HNG | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HNH | California | Anthem Blue-Cross |
| HNI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HNJ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HNK | - | Unallocated/Not Assigned |
| HNL | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HNM | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HNN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HNO | - | Unallocated/Not Assigned |
| HNP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HNQ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HNR | - | Unallocated/Not Assigned |
| HNS | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HNT | Texas | Blue-Cross Blue-Shield of Texas |
| HNU | - | Unallocated/Not Assigned |
| HNV | - | Unallocated/Not Assigned |
| HNW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HNX | Michigan | Blue-Cross Blue-Shield of Michigan |
| HNY | Michigan | Blue-Cross Blue-Shield of Michigan |
| HNZ | Michigan | Blue-Cross Blue-Shield of Michigan |
| HOA | Michigan | Blue-Cross Blue-Shield of Michigan |
| HOB | Mississippi | Blue-Cross Blue-Shield of Mississippi |
| HOC | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HOD | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HOE | Florida | Florida-Blue |
| HOF | - | Unallocated/Not Assigned |
| HOG | Arkansas | Arkansas Blue-Cross Blue-Shield |
| HOH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HOI | Idaho | Blue-Cross of Idaho |
| HOJ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HOK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HOL | - | Unallocated/Not Assigned |
| HOM | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HON | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HOO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HOP | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HOQ | - | Unallocated/Not Assigned |
| HOR | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HOS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HOT | - | Unallocated/Not Assigned |
| HOU | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HOV | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| HOW | Alabama | Blue-Cross Blue-Shield of Alabama |
| HOX | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HOY | - | Unallocated/Not Assigned |
| HOZ | - | Unallocated/Not Assigned |
| HPA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPB | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HPC | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HPD | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HPE | California | Anthem Blue-Cross |
| HPF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPG | Florida | Florida-Blue |
| HPH | - | Unallocated/Not Assigned |
| HPI | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| HPJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| HPK | California | Anthem Blue-Cross |
| HPL | - | Unallocated/Not Assigned |
| HPM | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HPN | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HPO | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| HPP | Illinois | Blue-Cross Blue-Shield of Illinois |
| HPQ | California | Anthem Blue-Cross |
| HPR | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPS | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HPT | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| HPU | Illinois | Blue-Cross Blue-Shield of Illinois |
| HPV | California | Anthem Blue-Cross |
| HPW | - | Unallocated/Not Assigned |
| HPX | - | Unallocated/Not Assigned |
| HPY | New York | Empire Blue-Cross Blue-Shield of New York |
| HPZ | Florida | Florida-Blue |
| HQA | - | Unallocated/Not Assigned |
| HQB | - | Unallocated/Not Assigned |
| HQC | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HQD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HQE | - | Unallocated/Not Assigned |
| HQF | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HQG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HQH | - | Unallocated/Not Assigned |
| HQI | - | Unallocated/Not Assigned |
| HQJ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HQK | - | Unallocated/Not Assigned |
| HQL | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HQM | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HQN | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HQO | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| HQP | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| HQQ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HQR | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| HQS | New York (Northeastern) | Blue-Shield of Northeastern New York |
| HQT | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| HQU | - | Unallocated/Not Assigned |
| HQV | - | Unallocated/Not Assigned |
| HQW | - | Unallocated/Not Assigned |
| HQX | New York (Northeastern) | Blue-Shield of Northeastern New York |
| HQY | Illinois | Blue-Cross Blue-Shield of Illinois |
| HQZ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HRA | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HRB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HRC | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| HRD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HRE | Illinois | Blue-Cross Blue-Shield of Illinois |
| HRF | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HRG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HRH | California | Anthem Blue-Cross |
| HRI | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HRJ | California | Anthem Blue-Cross |
| HRK | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HRL | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HRM | - | Unallocated/Not Assigned |
| HRN | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HRO | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| HRP | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HRQ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HRR | Illinois | Blue-Cross Blue-Shield of Illinois |
| HRS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HRT BCBS Prefix | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HRU | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| HRV | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HRW | Illinois | Blue-Cross Blue-Shield of Illinois |
| HRX | - | Unallocated/Not Assigned |
| HRY | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HRZ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HSA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSB | Texas | Blue-Cross Blue-Shield of Texas |
| HSC | - | Unallocated/Not Assigned |
| HSD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSE | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSG | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSH | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HSJ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSK | Illinois | Blue-Cross Blue-Shield of Illinois |
| HSL | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSM | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| HSN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HSO | Michigan | Blue-Cross Blue-Shield of Michigan |
| HSP | - | Unallocated/Not Assigned |
| HSQ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSR | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| HSS | - | Unallocated/Not Assigned |
| HST | Texas | Blue-Cross Blue-Shield of Texas |
| HSU | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSV | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HSW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HSX | Michigan | Blue-Cross Blue-Shield of Michigan |
| HSY | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HSZ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HTA | New York | Empire Blue-Cross Blue-Shield of New York |
| HTB | - | Unallocated/Not Assigned |
| HTC | Texas | Blue-Cross Blue-Shield of Texas |
| HTD | Illinois | Blue-Cross Blue-Shield of Illinois |
| HTE | Illinois | Blue-Cross Blue-Shield of Illinois |
| HTF | - | Unallocated/Not Assigned |
| HTG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HTH | - | Unallocated/Not Assigned |
| HTI | Idaho | Blue-Cross of Idaho |
| HTJ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HTK | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HTL | - | Unallocated/Not Assigned |
| HTM | - | Unallocated/Not Assigned |
| HTN | - | Unallocated/Not Assigned |
| HTO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HTP | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HTQ | - | Unallocated/Not Assigned |
| HTR | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HTS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HTT | - | Unallocated/Not Assigned |
| HTU | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HTV | Texas | Blue-Cross Blue-Shield of Texas |
| HTW | California | Anthem Blue-Cross |
| HTX | - | Unallocated/Not Assigned |
| HTY | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HTZ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HUA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HUB | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HUC | Michigan | Blue-Cross Blue-Shield of Michigan |
| HUD | New York | Empire Blue-Cross Blue-Shield of New York |
| HUE | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| HUF | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HUG | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| HUH | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HUI | - | Unallocated/Not Assigned |
| HUJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| HUK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HUL | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HUM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HUN | - | Unallocated/Not Assigned |
| HUO | - | Unallocated/Not Assigned |
| HUP | - | Unallocated/Not Assigned |
| HUQ | - | Unallocated/Not Assigned |
| HUR | Illinois | Blue-Cross Blue-Shield of Illinois |
| HUS | Michigan | Blue-Cross Blue-Shield of Michigan |
| HUT | Michigan | Blue-Cross Blue-Shield of Michigan |
| HUU | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| HUV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HUW | New York | Empire Blue-Cross Blue-Shield of New York |
| HUX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HUY | Alabama | Blue-Cross Blue-Shield of Alabama |
| HUZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HVA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HVB | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| HVC | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HVD | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HVE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HVF | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HVG | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HVH | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HVI | California | Blue-Shield of California |
| HVJ | - | Unallocated/Not Assigned |
| HVK | California | Anthem Blue-Cross |
| HVL | New York | Excellus Blue-Cross Blue-Shield of New York |
| HVM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HVN | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HVO | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HVP | Michigan | Blue-Cross Blue-Shield of Michigan |
| HVQ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HVR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HVS | - | Unallocated/Not Assigned |
| HVT | - | Unallocated/Not Assigned |
| HVU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HVV | - | Unallocated/Not Assigned |
| HVW | - | Unallocated/Not Assigned |
| HVX | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HVY | - | Unallocated/Not Assigned |
| HVZ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HWA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWB | - | Unallocated/Not Assigned |
| HWC | - | Unallocated/Not Assigned |
| HWD | California | Anthem Blue-Cross |
| HWE | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWF | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HWG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HWH | - | Unallocated/Not Assigned |
| HWI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HWJ | - | Unallocated/Not Assigned |
| HWK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HWL | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HWM | Idaho | Blue-Cross of Idaho |
| HWN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HWO | - | Unallocated/Not Assigned |
| HWP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HWQ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWR | - | Unallocated/Not Assigned |
| HWS | - | Unallocated/Not Assigned |
| HWT | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| HWU | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HWV | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HWW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HWY | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HWZ | Montana | Blue-Cross Blue-Shield of Montana |
| HXA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| HXB | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| HXC | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| HXD | - | Unallocated/Not Assigned |
| HXE | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| HXF | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| HXG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| HXH | - | Unallocated/Not Assigned |
| HXI | California | Blue-Shield of California |
| HXJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HXK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HXL | - | Unallocated/Not Assigned |
| HXM | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HXN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| HXO | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| HXP | - | Unallocated/Not Assigned |
| HXQ | Alabama | Blue-Cross Blue-Shield of Alabama |
| HXR | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HXS | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| HXT | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| HXU | - | Unallocated/Not Assigned |
| HXV | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HXW | - | Unallocated/Not Assigned |
| HXX | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| HXY | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| HXZ | - | Unallocated/Not Assigned |
| HYA | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HYB | - | Unallocated/Not Assigned |
| HYC | California | Blue-Shield of California |
| HYD | - | Unallocated/Not Assigned |
| HYE | - | Unallocated/Not Assigned |
| HYF | - | Unallocated/Not Assigned |
| HYG | Michigan | Blue-Cross Blue-Shield of Michigan |
| HYH | California | Blue-Shield of California |
| HYI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HYJ | Illinois | Blue-Cross Blue-Shield of Illinois |
| HYK | Illinois | Blue-Cross Blue-Shield of Illinois |
| HYL | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| HYM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HYN | Alabama | Blue-Cross Blue-Shield of Alabama |
| HYO | - | Unallocated/Not Assigned |
| HYP | - | Unallocated/Not Assigned |
| HYQ | Michigan | Blue-Cross Blue-Shield of Michigan |
| HYR | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HYS | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HYT | Illinois | Blue-Cross Blue-Shield of Illinois |
| HYU | - | Unallocated/Not Assigned |
| HYV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HYW | Illinois | Blue-Cross Blue-Shield of Illinois |
| HYX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HYY | - | Unallocated/Not Assigned |
| HYZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HZA | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HZB | Florida | Florida-Blue |
| HZC | Illinois | Blue-Cross Blue-Shield of Illinois |
| HZD | - | Unallocated/Not Assigned |
| HZE | - | Unallocated/Not Assigned |
| HZF | Illinois | Blue-Cross Blue-Shield of Illinois |
| HZG | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HZH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| HZI | - | Unallocated/Not Assigned |
| HZJ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HZK | Illinois | Blue-Cross Blue-Shield of Illinois |
| HZL | Texas | Blue-Cross Blue-Shield of Texas |
| HZM | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| HZN | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| HZO | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| HZP | - | Unallocated/Not Assigned |
| HZQ | California | Blue-Shield of California |
| HZR | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HZS | California | Blue-Shield of California |
| HZT | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| HZU | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| HZV | California | Anthem Blue-Cross |
| HZW | Michigan | Blue-Cross Blue-Shield of Michigan |
| HZX | Michigan | Blue-Cross Blue-Shield of Michigan |
| HZY | Texas | Blue-Cross Blue-Shield of Texas |
| HZZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |