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