| BAA | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BAB | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| BAC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BAD | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BAE | New York | Empire Blue-Cross Blue-Shield of New York |
| BAF | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| BAG | Alabama | Blue-Cross Blue-Shield of Alabama |
| BAH | - | Unallocated/Not Assigned |
| BAI | - | Unallocated/Not Assigned |
| BAJ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BAK | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BAL | North Dakota | Blue-Cross Blue-Shield of North Dakota |
| BAM | Illinois | Blue-Cross Blue-Shield of Illinois |
| BAN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BAO | - | Unallocated/Not Assigned |
| BAP | Illinois | Blue-Cross Blue-Shield of Illinois |
| BAQ | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BAR | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BAS | Texas | Blue-Cross Blue-Shield of Texas |
| BAT | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BAU | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BAV | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BAW | New York | Empire Blue-Cross Blue-Shield of New York |
| BAX | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BAY | California | Anthem Blue-Cross |
| BAZ | Texas | Blue-Cross Blue-Shield of Texas |
| BBA | Florida | Florida-Blue |
| BBB | - | Unallocated/Not Assigned |
| BBC | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BBD | - | Unallocated/Not Assigned |
| BBE | Illinois | Blue-Cross Blue-Shield of Illinois |
| BBF | - | Unallocated/Not Assigned |
| BBG | Texas | Blue-Cross Blue-Shield of Texas |
| BBH | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| BBI | Michigan | Blue-Cross Blue-Shield of Michigan |
| BBJ | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BBK | California | Anthem Blue-Cross |
| BBL | California | Anthem Blue-Cross |
| BBM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BBN | - | Unallocated/Not Assigned |
| BBO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BBP | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BBQ | Alabama | Blue-Cross Blue-Shield of Alabama |
| BBR | - | Unallocated/Not Assigned |
| BBS | Alabama | Blue-Cross Blue-Shield of Alabama |
| BBT | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BBU | Illinois | Blue-Cross Blue-Shield of Illinois |
| BBV | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BBW | California | Anthem Blue-Cross |
| BBX | - | Unallocated/Not Assigned |
| BBY | Michigan | Blue-Cross Blue-Shield of Michigan |
| BBZ | Illinois | Blue-Cross Blue-Shield of Illinois |
| BCA | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BCB | Illinois | Blue-Cross Blue-Shield of Illinois |
| BCC | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BCD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BCE | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BCF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BCG | Texas | Blue-Cross Blue-Shield of Texas |
| BCH | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BCI | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BCJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BCK | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BCL | California | Anthem Blue-Cross |
| BCM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BCN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BCO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BCP | California | Anthem Blue-Cross |
| BCQ | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BCR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BCS | Illinois | Blue-Cross Blue-Shield of Illinois |
| BCT | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BCU | - | Unallocated/Not Assigned |
| BCV | California | Blue-Shield of California |
| BCW | New York | Empire Blue-Cross Blue-Shield of New York |
| BCX | Illinois | Blue-Cross Blue-Shield of Illinois |
| BCY | Florida | Florida-Blue |
| BCZ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BDA | Michigan | Blue-Cross Blue-Shield of Michigan |
| BDB | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BDC | Michigan | Blue-Cross Blue-Shield of Michigan |
| BDD | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BDE | - | Unallocated/Not Assigned |
| BDF | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BDG | Illinois | Blue-Cross Blue-Shield of Illinois |
| BDH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BDI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BDJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BDK | - | Unallocated/Not Assigned |
| BDL | Illinois | Blue-Cross Blue-Shield of Illinois |
| BDM | Alabama | Blue-Cross Blue-Shield of Alabama |
| BDN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BDO | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BDP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BDQ | - | Unallocated/Not Assigned |
| BDR | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BDS | Michigan | Blue-Cross Blue-Shield of Michigan |
| BDT | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BDU | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| BDV | - | Unallocated/Not Assigned |
| BDW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BDX | - | Unallocated/Not Assigned |
| BDY | - | Unallocated/Not Assigned |
| BDZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BEA | Florida | Florida-Blue |
| BEB | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BEC | Michigan | Blue-Cross Blue-Shield of Michigan |
| BED | - | Unallocated/Not Assigned |
| BEE | Michigan | Blue-Cross Blue-Shield of Michigan |
| BEF | Michigan | Blue-Cross Blue-Shield of Michigan |
| BEG | Alabama | Blue-Cross Blue-Shield of Alabama |
| BEH | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BEI | Michigan | Blue-Cross Blue-Shield of Michigan |
| BEJ | Texas | Blue-Cross Blue-Shield of Texas |
| BEK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BEL | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BEM | Illinois | Blue-Cross Blue-Shield of Illinois |
| BEN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BEO | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BEP | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BEQ | - | Unallocated/Not Assigned |
| BER | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BES | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BET | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BEU | Florida | Florida-Blue |
| BEV | - | Unallocated/Not Assigned |
| BEW | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BEX | - | Unallocated/Not Assigned |
| BEY | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BEZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BFA | - | Unallocated/Not Assigned |
| BFB | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| BFC | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BFD | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| BFE | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| BFF | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| BFG | Texas | Blue-Cross Blue-Shield of Texas |
| BFH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BFI | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BFJ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BFK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BFL | Florida | Florida-Blue |
| BFM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BFN | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BFO | Michigan | Blue-Cross Blue-Shield of Michigan |
| BFP | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BFQ | Texas | Blue-Cross Blue-Shield of Texas |
| BFR | Florida | Florida-Blue |
| BFS | Texas | Blue-Cross Blue-Shield of Texas |
| BFT | - | Unallocated/Not Assigned |
| BFU | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BFV | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BFW | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BFX | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BFY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BFZ | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BGA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BGB | Michigan | Blue-Cross Blue-Shield of Michigan |
| BGC | Michigan | Blue-Cross Blue-Shield of Michigan |
| BGD | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BGE | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BGF | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BGG | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BGH | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BGI | Alabama | Blue-Cross Blue-Shield of Alabama |
| BGJ | California | Blue-Shield of California |
| BGK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BGL | Alabama | Blue-Cross Blue-Shield of Alabama |
| BGM | California | Anthem Blue-Cross |
| BGN | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BGO | Florida | Florida-Blue |
| BGP | Michigan | Blue-Cross Blue-Shield of Michigan |
| BGQ | - | Unallocated/Not Assigned |
| BGR | Illinois | Blue-Cross Blue-Shield of Illinois |
| BGS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BGT | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BGU | - | Unallocated/Not Assigned |
| BGV | - | Unallocated/Not Assigned |
| BGW | New York | Empire Blue-Cross Blue-Shield of New York |
| BGX | Texas | Blue-Cross Blue-Shield of Texas |
| BGY | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| BGZ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BHA | - | Unallocated/Not Assigned |
| BHB | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| BHC | - | Unallocated/Not Assigned |
| BHD | - | Unallocated/Not Assigned |
| BHE | Texas | Blue-Cross Blue-Shield of Texas |
| BHF | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BHG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BHH | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BHI | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BHJ | - | Unallocated/Not Assigned |
| BHK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BHL | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| BHM | Michigan | Blue-Cross Blue-Shield of Michigan |
| BHN | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| BHO | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BHP | Illinois | Blue-Cross Blue-Shield of Illinois |
| BHQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BHR | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| BHS | Idaho | Blue-Cross of Idaho |
| BHT | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BHU | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BHV | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BHW | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| BHX | Montana | Blue-Cross Blue-Shield of Montana |
| BHY | - | Unallocated/Not Assigned |
| BHZ | - | Unallocated/Not Assigned |
| BIA | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BIB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BIC | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BID | - | Unallocated/Not Assigned |
| BIE | Michigan | Blue-Cross Blue-Shield of Michigan |
| BIF | - | Unallocated/Not Assigned |
| BIG | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BIH | - | Unallocated/Not Assigned |
| BII | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BIJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BIK | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BIL | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BIM | Michigan | Blue-Cross Blue-Shield of Michigan |
| BIN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BIO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BIP | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BIQ | - | Unallocated/Not Assigned |
| BIR | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BIS | Michigan | Blue-Cross Blue-Shield of Michigan |
| BIT | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BIU | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BIV | - | Unallocated/Not Assigned |
| BIW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BIX | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BIY | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BIZ | - | Unallocated/Not Assigned |
| BJA | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BJB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BJC | - | Unallocated/Not Assigned |
| BJD | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BJE | - | Unallocated/Not Assigned |
| BJF | - | Unallocated/Not Assigned |
| BJG | Illinois | Blue-Cross Blue-Shield of Illinois |
| BJH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BJI | Florida | Florida-Blue |
| BJJ | - | Unallocated/Not Assigned |
| BJK | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BJL | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BJM | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BJN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BJO | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| BJP | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BJQ | Illinois | Blue-Cross Blue-Shield of Illinois |
| BJR | - | Unallocated/Not Assigned |
| BJS | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BJT | - | Unallocated/Not Assigned |
| BJU | - | Unallocated/Not Assigned |
| BJV | Florida | Florida-Blue |
| BJW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BJX | - | Unallocated/Not Assigned |
| BJY | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BJZ | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BKA | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BKB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BKC | Illinois | Blue-Cross Blue-Shield of Illinois |
| BKD | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BKE | - | Unallocated/Not Assigned |
| BKF | - | Unallocated/Not Assigned |
| BKG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BKH | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BKI | California | Anthem Blue-Cross |
| BKJ | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| BKK | Texas | Blue-Cross Blue-Shield of Texas |
| BKL | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BKM | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BKN | California | Blue-Shield of California |
| BKO | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BKP | California | Blue-Shield of California |
| BKQ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BKR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BKS | Alabama | Blue-Cross Blue-Shield of Alabama |
| BKT | New York | Empire Blue-Cross Blue-Shield of New York |
| BKU | - | Unallocated/Not Assigned |
| BKV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BKW | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BKX | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BKY | Idaho | Blue-Cross of Idaho |
| BKZ | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BLA | Florida | Florida-Blue |
| BLB | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BLC | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BLD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| BLE | Florida | Florida-Blue |
| BLF | - | Unallocated/Not Assigned |
| BLG | - | Unallocated/Not Assigned |
| BLH | Idaho | Blue-Cross of Idaho |
| BLI | - | Unallocated/Not Assigned |
| BLJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BLK | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BLL | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BLM | Florida | Florida-Blue |
| BLN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BLO | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BLP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BLQ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BLR | Illinois | Blue-Cross Blue-Shield of Illinois |
| BLS | New York | Empire Blue-Cross Blue-Shield of New York |
| BLT | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BLU | Alabama | Blue-Cross Blue-Shield of Alabama |
| BLV | - | Unallocated/Not Assigned |
| BLW | Illinois | Blue-Cross Blue-Shield of Illinois |
| BLX | Illinois | Blue-Cross Blue-Shield of Illinois |
| BLY | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BLZ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BMA | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BMB | Illinois | Blue-Cross Blue-Shield of Illinois |
| BMC | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BMD | - | Unallocated/Not Assigned |
| BME | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BMF | New York | Empire Blue-Cross Blue-Shield of New York |
| BMG | Texas | Blue-Cross Blue-Shield of Texas |
| BMH | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BMI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BMJ | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BMK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BML | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BMM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BMN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BMO | Illinois | Blue-Cross Blue-Shield of Illinois |
| BMP | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BMQ | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BMR | - | Unallocated/Not Assigned |
| BMS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BMT | Illinois | Blue-Cross Blue-Shield of Illinois |
| BMU | - | Unallocated/Not Assigned |
| BMV | Florida | Florida-Blue |
| BMW | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| BMX | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| BMY | Texas | Blue-Cross Blue-Shield of Texas |
| BMZ | - | Unallocated/Not Assigned |
| BNA | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BNB | - | Unallocated/Not Assigned |
| BNC | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BND | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BNE | - | Unallocated/Not Assigned |
| BNF | Illinois | Blue-Cross Blue-Shield of Illinois |
| BNG | California | Anthem Blue-Cross |
| BNH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BNI | - | Unallocated/Not Assigned |
| BNJ | - | Unallocated/Not Assigned |
| BNK | Illinois | Blue-Cross Blue-Shield of Illinois |
| BNL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BNM | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| BNN | Texas | Blue-Cross Blue-Shield of Texas |
| BNO | - | Unallocated/Not Assigned |
| BNP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BNQ | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| BNR | - | Unallocated/Not Assigned |
| BNS | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BNT | Illinois | Blue-Cross Blue-Shield of Illinois |
| BNU | Illinois | Blue-Cross Blue-Shield of Illinois |
| BNV | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BNW | California | Blue-Shield of California |
| BNX | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BNY | California | Anthem Blue-Cross |
| BNZ | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BOA | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BOB | Florida | Florida-Blue |
| BOC | Michigan | Blue-Cross Blue-Shield of Michigan |
| BOD | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BOE | California | Blue-Shield of California |
| BOF | Michigan | Blue-Cross Blue-Shield of Michigan |
| BOG | Michigan | Blue-Cross Blue-Shield of Michigan |
| BOH | California | Blue-Shield of California |
| BOI | - | Unallocated/Not Assigned |
| BOJ | California | Blue-Shield of California |
| BOK | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| BOL | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BOM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BON | - | Unallocated/Not Assigned |
| BOO | - | Unallocated/Not Assigned |
| BOP | Michigan | Blue-Cross Blue-Shield of Michigan |
| BOQ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BOR | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BOS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BOT | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BOU | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| BOV | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BOW | Texas | Blue-Cross Blue-Shield of Texas |
| BOX | California | Blue-Shield of California |
| BOY | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BOZ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BPA | Illinois | Blue-Cross Blue-Shield of Illinois |
| BPB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BPC | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BPD | Illinois | Blue-Cross Blue-Shield of Illinois |
| BPE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BPF | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BPG | Illinois | Blue-Cross Blue-Shield of Illinois |
| BPH | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BPI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BPJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| BPK | Michigan | Blue-Cross Blue-Shield of Michigan |
| BPL | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BPM | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| BPN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BPO | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BPP | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BPQ | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| BPR | New York | Empire Blue-Cross Blue-Shield of New York |
| BPS | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| BPT | - | Unallocated/Not Assigned |
| BPU | - | Unallocated/Not Assigned |
| BPV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BPW | Michigan | Blue-Cross Blue-Shield of Michigan |
| BPX | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BPY | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BPZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BQA | - | Unallocated/Not Assigned |
| BQB | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BQC | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BQD | - | Unallocated/Not Assigned |
| BQE | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BQF | - | Unallocated/Not Assigned |
| BQG | - | Unallocated/Not Assigned |
| BQH | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BQI | California | Blue-Shield of California |
| BQJ | - | Unallocated/Not Assigned |
| BQK | - | Unallocated/Not Assigned |
| BQL | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BQM | - | Unallocated/Not Assigned |
| BQN | - | Unallocated/Not Assigned |
| BQO | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BQP | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BQQ | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BQR | - | Unallocated/Not Assigned |
| BQS | - | Unallocated/Not Assigned |
| BQT | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BQU | - | Unallocated/Not Assigned |
| BQV | - | Unallocated/Not Assigned |
| BQW | Michigan | Blue-Cross Blue-Shield of Michigan |
| BQX | California | Blue-Shield of California |
| BQY | - | Unallocated/Not Assigned |
| BQZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BRA | California | Blue-Shield of California |
| BRB | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BRC | California | Blue-Shield of California |
| BRD | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| BRE | Michigan | Blue-Cross Blue-Shield of Michigan |
| BRF | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BRG | Illinois | Blue-Cross Blue-Shield of Illinois |
| BRH | Texas | Blue-Cross Blue-Shield of Texas |
| BRI | - | Unallocated/Not Assigned |
| BRJ | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| BRK | Texas | Blue-Cross Blue-Shield of Texas |
| BRL | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BRM | Michigan | Blue-Cross Blue-Shield of Michigan |
| BRN | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BRO | Alabama | Blue-Cross Blue-Shield of Alabama |
| BRP | Michigan | Blue-Cross Blue-Shield of Michigan |
| BRQ | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| BRR | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BRS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BRT | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BRU | Illinois | Blue-Cross Blue-Shield of Illinois |
| BRV | Michigan | Blue-Cross Blue-Shield of Michigan |
| BRW | Illinois | Blue-Cross Blue-Shield of Illinois |
| BRX | California | Anthem Blue-Cross |
| BRY | California | Blue-Shield of California |
| BRZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BSA | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BSB | - | Unallocated/Not Assigned |
| BSC | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BSD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BSE | Texas | Blue-Cross Blue-Shield of Texas |
| BSF | - | Unallocated/Not Assigned |
| BSG | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BSH | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BSI | Michigan | Blue-Cross Blue-Shield of Michigan |
| BSJ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| BSK | - | Unallocated/Not Assigned |
| BSL | Texas | Blue-Cross Blue-Shield of Texas |
| BSM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BSN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BSO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BSP | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BSQ | - | Unallocated/Not Assigned |
| BSR | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BSS | - | Unallocated/Not Assigned |
| BST | - | Unallocated/Not Assigned |
| BSU | Florida | Florida-Blue |
| BSV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BSW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BSX | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BSY | California | Blue-Shield of California |
| BSZ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BTA | Illinois | Blue-Cross Blue-Shield of Illinois |
| BTB | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BTC | - | Unallocated/Not Assigned |
| BTD | New York | Empire Blue-Cross Blue-Shield of New York |
| BTE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BTF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BTG | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BTH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BTI | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BTJ | - | Unallocated/Not Assigned |
| BTK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BTL | - | Unallocated/Not Assigned |
| BTM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BTN | Idaho | Blue-Cross of Idaho |
| BTO | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BTP | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| BTQ | - | Unallocated/Not Assigned |
| BTR | - | Unallocated/Not Assigned |
| BTS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BTT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BTU | Arkansas | Arkansas Blue-Cross Blue-Shield |
| BTV | - | Unallocated/Not Assigned |
| BTW | California | Anthem Blue-Cross |
| BTX | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BTY | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| BTZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BUA | - | Unallocated/Not Assigned |
| BUB | Michigan | Blue-Cross Blue-Shield of Michigan |
| BUC | - | Unallocated/Not Assigned |
| BUD | Michigan | Blue-Cross Blue-Shield of Michigan |
| BUE | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BUF | Michigan | Blue-Cross Blue-Shield of Michigan |
| BUG | - | Unallocated/Not Assigned |
| BUH | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| BUI | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BUJ | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BUK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BUL | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BUM | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BUN | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BUO | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BUP | - | Unallocated/Not Assigned |
| BUQ | - | Unallocated/Not Assigned |
| BUR | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BUS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BUT | - | Unallocated/Not Assigned |
| BUU | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BUV | - | Unallocated/Not Assigned |
| BUW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BUX | Michigan | Blue-Cross Blue-Shield of Michigan |
| BUY | - | Unallocated/Not Assigned |
| BUZ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BVA | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BVB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BVC | - | Unallocated/Not Assigned |
| BVD | California | Blue-Shield of California |
| BVE | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BVF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BVG | Illinois | Blue-Cross Blue-Shield of Illinois |
| BVH | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BVI | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| BVJ | - | Unallocated/Not Assigned |
| BVK | - | Unallocated/Not Assigned |
| BVL | - | Unallocated/Not Assigned |
| BVM | Kansas | Blue-Cross Blue-Shield of Kansas City |
| BVN | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BVO | Idaho | Blue-Cross of Idaho |
| BVP | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| BVQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BVR | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BVS | - | Unallocated/Not Assigned |
| BVT | Vermont | Blue-Cross Blue-Shield of Vermont |
| BVU | - | Unallocated/Not Assigned |
| BVV | - | Unallocated/Not Assigned |
| BVW | - | Unallocated/Not Assigned |
| BVX | - | Unallocated/Not Assigned |
| BVY | - | Unallocated/Not Assigned |
| BVZ | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BWA | Vermont | Blue-Cross Blue-Shield of Vermont |
| BWB | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BWC | Texas | Blue-Cross Blue-Shield of Texas |
| BWD | Michigan | Blue-Cross Blue-Shield of Michigan |
| BWE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BWF | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BWG | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BWH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BWI | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BWJ | - | Unallocated/Not Assigned |
| BWK | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BWL | Illinois | Blue-Cross Blue-Shield of Illinois |
| BWM | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BWN | Michigan | Blue-Cross Blue-Shield of Michigan |
| BWO | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BWP | - | Unallocated/Not Assigned |
| BWQ | - | Unallocated/Not Assigned |
| BWR | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BWS | - | Unallocated/Not Assigned |
| BWT | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| BWU | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BWV | - | Unallocated/Not Assigned |
| BWW | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| BWX | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BWY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BWZ | California | Anthem Blue-Cross |
| BXA | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| BXB | Montana | Blue-Cross Blue-Shield of Montana |
| BXC | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| BXD | - | Unallocated/Not Assigned |
| BXE | Illinois | Blue-Cross Blue-Shield of Illinois |
| BXF | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BXG | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BXH | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BXI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BXJ | - | Unallocated/Not Assigned |
| BXK | - | Unallocated/Not Assigned |
| BXL | Idaho | Blue-Cross of Idaho |
| BXM | - | Unallocated/Not Assigned |
| BXN | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BXO | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BXP | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| BXQ | Illinois | Blue-Cross Blue-Shield of Illinois |
| BXR | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BXS | - | Unallocated/Not Assigned |
| BXT | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| BXU | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| BXV | Michigan | Blue-Cross Blue-Shield of Michigan |
| BXW | - | Unallocated/Not Assigned |
| BXX | - | Unallocated/Not Assigned |
| BXY | - | Unallocated/Not Assigned |
| BXZ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BYA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| BYB | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BYC | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BYD | - | Unallocated/Not Assigned |
| BYE | - | Unallocated/Not Assigned |
| BYF | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BYG | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BYH | - | Unallocated/Not Assigned |
| BYI | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BYJ | California | Anthem Blue-Cross |
| BYK | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BYL | - | Unallocated/Not Assigned |
| BYM | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| BYN | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| BYO | Idaho | Blue-Cross of Idaho |
| BYP | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BYQ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BYR | Illinois | Blue-Cross Blue-Shield of Illinois |
| BYS | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| BYT | - | Unallocated/Not Assigned |
| BYU | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| BYV | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| BYW | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| BYX | - | Unallocated/Not Assigned |
| BYY | - | Unallocated/Not Assigned |
| BYZ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| BZA | - | Unallocated/Not Assigned |
| BZB | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BZC | - | Unallocated/Not Assigned |
| BZD | - | Unallocated/Not Assigned |
| BZE | - | Unallocated/Not Assigned |
| BZF | - | Unallocated/Not Assigned |
| BZG | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BZH | Michigan | Blue-Cross Blue-Shield of Michigan |
| BZI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BZJ | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BZK | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| BZL | - | Unallocated/Not Assigned |
| BZM | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| BZN | - | Unallocated/Not Assigned |
| BZO | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BZP | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| BZQ | - | Unallocated/Not Assigned |
| BZR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| BZS | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| BZT | California | Blue-Shield of California |
| BZU | Michigan | Blue-Cross Blue-Shield of Michigan |
| BZV | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| BZW | - | Unallocated/Not Assigned |
| BZX | Michigan | Blue-Cross Blue-Shield of Michigan |
| BZY | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| BZZ | North Carolina | Blue-Cross Blue-Shield of North Carolina |