| ZAA | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAB | Highmark BCBS of Pennsylvania |
| ZAC | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAD | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAE | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAF | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAG | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAH | Highmark BCBS of Pennsylvania |
| ZAI | Highmark BCBS of Pennsylvania |
| ZAJ | Highmark BCBS of Pennsylvania |
| ZAK | Highmark BCBS of Pennsylvania |
| ZAL | Highmark BCBS of Pennsylvania |
| ZAM | Highmark BCBS of Pennsylvania |
| ZAN | Highmark BCBS of Pennsylvania |
| ZAO | Highmark BCBS of Pennsylvania |
| ZAP | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAQ | Highmark BCBS of Pennsylvania |
| ZAR | Highmark BCBS of Pennsylvania |
| ZAS | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAT | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAU | Highmark BCBS of Pennsylvania |
| ZAV | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAW | Alpha Prefix not assigned or unallocated |
| ZAX | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZAY | Highmark BCBS of Pennsylvania |
| ZAZ | Highmark BCBS of Pennsylvania |
| ZBA | BCBS of Rhode Island |
| ZBB | BCBS of Massachusetts |
| ZBC | Anthem BCBS of Virginia |
| ZBD | BCBS of Rhode Island |
| ZBE | BCBS of Rhode Island |
| ZBF | BCBS of Rhode Island |
| ZBG | BCBS of Rhode Island |
| ZBH | BCBS of Rhode Island |
| ZBI | BCBS of Rhode Island |
| ZBJ | Alpha Prefix not assigned or unallocated |
| ZBK | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZBL | Blueshield of California |
| ZBM | BCBS of Rhode Island |
| ZBN | BCBS of Rhode Island |
| ZBO | BCBS of Rhode Island |
| ZBP | BCBS of Rhode Island |
| ZBQ | Anthem BCBS of Ohio |
| ZBR | BCBS of Rhode Island |
| ZBS | BCBS of Rhode Island |
| ZBT | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZBU | BCBS of Illinois |
| ZBV | Anthem BCBS of Wisconsin |
| ZBW | Wellmark BCBS of South Dakota/Iowa |
| ZBX | Anthem Bluecross of California |
| ZBY | BCBS of Minnesota |
| ZBZ | Anthem BCBS of Wisconsin |
| ZCA | BCBS of South Carolina |
| ZCB | BCBS of Costa Rica |
| ZCC | BCBS of South Carolina |
| ZCD | Alpha Prefix not assigned or unallocated |
| ZCE | BCBS of South Carolina |
| ZCF | BCBS of South Carolina |
| ZCG | Alpha Prefix not assigned or unallocated |
| ZCH | BCBS of South Carolina |
| ZCI | Anthem BCBS of Kentucky |
| ZCJ | BCBS of South Carolina |
| ZCK | BCBS of South Carolina |
| ZCL | BCBS of South Carolina |
| ZCM | Alpha Prefix not assigned or unallocated |
| ZCN | BCBS of South Carolina |
| ZCO | BCBS of South Carolina |
| ZCP | BCBS of South Carolina |
| ZCQ | Alpha Prefix not assigned or unallocated |
| ZCR | Alpha Prefix not assigned or unallocated |
| ZCS | BCBS of South Carolina |
| ZCT | Alpha Prefix not assigned or unallocated |
| ZCU | BCBS of South Carolina |
| ZCV | BCBS of South Carolina |
| ZCW | BCBS of South Carolina |
| ZCX | BCBS of South Carolina |
| ZCY | BCBS of South Carolina |
| ZCZ | BCBS of South Carolina |
| ZDA | Blueshield of California |
| ZDB | Blueshield of California |
| ZDC | Alpha Prefix not assigned or unallocated |
| ZDD | Anthem BCBS of Kentucky |
| ZDE | Anthem BCBS of Nevada |
| ZDF | Alpha Prefix not assigned or unallocated |
| ZDG | Anthem BCBS of Nevada |
| ZDH | Anthem BCBS of Ohio |
| ZDI | Anthem Bluecross of California |
| ZDJ | Anthem BCBS of Ohio |
| ZDK | Blueshield of California |
| ZDL | BCBS of Illinois |
| ZDM | BCBS of Western New York |
| ZDN | Alpha Prefix not assigned or unallocated |
| ZDO | Anthem Bluecross of California |
| ZDP | Empire BCBS of New York |
| ZDQ | BCBS of Western New York |
| ZDR | Alpha Prefix not assigned or unallocated |
| ZDS | Anthem BCBS of Virginia |
| ZDT | Wellmark BCBS of South Dakota/Iowa |
| ZDU | Wellmark BCBS of South Dakota/Iowa |
| ZDV | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZDW | Empire BCBS of New York |
| ZDX | Anthem BCBS of Connecticut |
| ZDY | Blueshield of California |
| ZDZ | Alpha Prefix not assigned or unallocated |
| ZEA | BCBS of Tennessee |
| ZEB | BCBS of Tennessee |
| ZEC | BCBS of Tennessee |
| ZED | BCBS of Tennessee |
| ZEE | BCBS of Tennessee |
| ZEF | Wellmark BCBS of South Dakota/Iowa |
| ZEG | BCBS of Illinois |
| ZEH | BCBS of Tennessee |
| ZEI | Anthem Bluecross of California |
| ZEJ | BCBS of Tennessee |
| ZEK | BCBS of Tennessee |
| ZEL | Alpha Prefix not assigned or unallocated |
| ZEM | BCBS of Tennessee |
| ZEN | BCBS of Tennessee |
| ZEO | Anthem Bluecross of California |
| ZEP | Alpha Prefix not assigned or unallocated |
| ZEQ | Anthem Bluecross of California |
| ZER | BCBS of Tennessee |
| ZES | BCBS of Tennessee |
| ZET | BCBS of Tennessee |
| ZEU | BCBS of Tennessee |
| ZEV | BCBS of Tennessee |
| ZEW | BCBS of Tennessee |
| ZEX | BCBS of Tennessee |
| ZEY | Alpha Prefix not assigned or unallocated |
| ZEZ | Anthem BCBS of Wisconsin |
| ZFA | Anthem BCBS of Missouri |
| ZFB | Anthem BCBS of Missouri |
| ZFC | BCBS of Illinois |
| ZFD | BCBS of Alabama |
| ZFE | Anthem BCBS of Georgia |
| ZFF | Premera Bluecross of Alaska |
| ZFG | BCBS of Minnesota |
| ZFH | Anthem BCBS of Wisconsin |
| ZFI | BCBS of Michigan |
| ZFJ | Alpha Prefix not assigned or unallocated |
| ZFK | Alpha Prefix not assigned or unallocated |
| ZFL | Blueshield of California |
| ZFM | BCBS of Western New York |
| ZFN | BCBS of Illinois |
| ZFO | Anthem Bluecross of California |
| ZFP | Anthem BCBS of Missouri |
| ZFQ | Anthem Bluecross of California |
| ZFR | BCBS of Illinois |
| ZFS | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZFT | Anthem BCBS of Virginia |
| ZFU | BCBS of Illinois |
| ZFV | BCBS of Illinois |
| ZFW | BCBS of Illinois |
| ZFX | Anthem BCBS of Missouri |
| ZFY | Anthem BCBS of Connecticut |
| ZFZ | Anthem BCBS of Ohio |
| ZGA | BCBS of Texas |
| ZGB | BCBS of Texas |
| ZGC | BCBS of Texas |
| ZGD | BCBS of Texas |
| ZGE | BCBS of Texas |
| ZGF | Alpha Prefix not assigned or unallocated |
| ZGG | Alpha Prefix not assigned or unallocated |
| ZGH | BCBS of Texas |
| ZGI | BCBS of Texas |
| ZGJ | BCBS of Texas |
| ZGK | Alpha Prefix not assigned or unallocated |
| ZGL | BCBS of Texas |
| ZGM | BCBS of Texas |
| ZGN | BCBS of Texas |
| ZGO | BCBS of Texas |
| ZGP | BCBS of Texas |
| ZGQ | BCBS of Texas |
| ZGR | BCBS of Texas |
| ZGS | BCBS of Texas |
| ZGT | BCBS of Texas |
| ZGU | BCBS of Texas |
| ZGV | BCBS of Texas |
| ZGW | BCBS of Texas |
| ZGX | BCBS of Texas |
| ZGY | BCBS of Texas |
| ZGZ | BCBS of Texas |
| ZHA | Blueshield of California |
| ZHB | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHC | Blueshield of California |
| ZHD | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHE | Empire BCBS of New York |
| ZHF | Wellmark BCBS of South Dakota/Iowa |
| ZHG | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHH | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHI | Alpha Prefix not assigned or unallocated |
| ZHJ | Anthem BCBS of Georgia |
| ZHK | BCBS of Alabama |
| ZHL | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHM | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHN | Wellmark BCBS of South Dakota/Iowa |
| ZHO | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHP | BCBS of South Carolina |
| ZHQ | BCBS of Minnesota |
| ZHR | Alpha Prefix not assigned or unallocated |
| ZHS | Empire BCBS of New York |
| ZHT | Blueshield of California |
| ZHU | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHV | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHW | Anthem BCBS of Georgia |
| ZHX | Anthem BCBS of Ohio |
| ZHY | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZHZ | Anthem BCBS of Georgia |
| ZIA | BCBS of Vermont |
| ZIB | BCBS of Vermont |
| ZIC | Anthem BCBS of Indiana |
| ZID | BCBS of Vermont |
| ZIE | BCBS of Vermont |
| ZIF | Alpha Prefix not assigned or unallocated |
| ZIG | BCBS of Vermont |
| ZIH | BCBS of Vermont |
| ZII | BCBS of Vermont |
| ZIJ | BCBS of Vermont |
| ZIK | BCBS of Vermont |
| ZIL | BCBS of Vermont |
| ZIM | Anthem BCBS of Virginia |
| ZIN | Wellmark BCBS of South Dakota/Iowa |
| ZIO | BCBS of Michigan |
| ZIP | Anthem Bluecross of California |
| ZIQ | Horizon BCBS of New Jersey |
| ZIR | Anthem Bluecross of California |
| ZIS | Wellmark BCBS of South Dakota/Iowa |
| ZIT | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZIU | BCBS of Vermont |
| ZIV | Anthem BCBS of Ohio |
| ZIW | Highmark BCBS of Pennsylvania |
| ZIX | Anthem Bluecross of California |
| ZIY | Horizon BCBS of New Jersey |
| ZIZ | BCBS of Michigan |
| ZJA | Anthem BCBS of Ohio |
| ZJB | BCBS of Minnesota |
| ZJC | Alpha Prefix not assigned or unallocated |
| ZJD | Anthem Bluecross of California |
| ZJE | Alpha Prefix not assigned or unallocated |
| ZJF | Anthem BCBS of Indiana |
| ZJG | BCBS of Alabama |
| ZJH | Anthem BCBS of Connecticut |
| ZJI | Anthem BCBS of Wisconsin |
| ZJJ | Alpha Prefix not assigned or unallocated |
| ZJK | Anthem BCBS of Georgia |
| ZJL | Horizon BCBS of New Jersey |
| ZJM | Anthem Bluecross of California |
| ZJN | Anthem BCBS of Ohio |
| ZJO | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZJP | Anthem Bluecross of California |
| ZJQ | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZJR | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZJS | Anthem BCBS of Missouri |
| ZJT | Anthem BCBS of Connecticut |
| ZJU | Anthem Bluecross of California |
| ZJV | Anthem BCBS of Missouri |
| ZJW | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZJX | BCBS of Western New York |
| ZJY | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZJZ | Alpha Prefix not assigned or unallocated |
| ZKA | Premera BCBS of Alaska |
| ZKB | Premera BCBS of Alaska |
| ZKC | Premera BCBS of Alaska |
| ZKD | Premera BCBS of Alaska |
| ZKE | Premera BCBS of Alaska |
| ZKF | Premera BCBS of Alaska |
| ZKG | Premera BCBS of Alaska |
| ZKH | Premera BCBS of Alaska |
| ZKI | Premera Bluecross of Alaska |
| ZKJ | Premera BCBS of Alaska |
| ZKK | Premera BCBS of Alaska |
| ZKL | Premera BCBS of Alaska |
| ZKM | Premera BCBS of Alaska |
| ZKN | Premera BCBS of Alaska |
| ZKO | Horizon BCBS of New Jersey |
| ZKP | Premera BCBS of Alaska |
| ZKQ | Premera BCBS of Alaska |
| ZKR | Premera BCBS of Alaska |
| ZKS | Premera BCBS of Alaska |
| ZKT | Premera BCBS of Alaska |
| ZKU | Premera BCBS of Alaska |
| ZKV | Premera BCBS of Alaska |
| ZKW | Anthem BCBS of Missouri |
| ZKX | Premera BCBS of Alaska |
| ZKY | Premera BCBS of Alaska |
| ZKZ | Premera BCBS of Alaska |
| ZLA | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLB | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLC | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLD | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLE | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLF | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLG | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLH | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLI | Anthem BCBS of Ohio |
| ZLJ | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLK | Alpha Prefix not assigned or unallocated |
| ZLL | Alpha Prefix not assigned or unallocated |
| ZLM | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLN | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLO | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLP | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLQ | Alpha Prefix not assigned or unallocated |
| ZLR | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLS | Alpha Prefix not assigned or unallocated |
| ZLT | Bluecross of Idaho |
| ZLU | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLV | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLW | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLX | Anthem BCBS of Nevada |
| ZLY | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZLZ | Blueshield of California |
| ZMA | Anthem BCBS of Virginia |
| ZMB | BCBS of Minnesota |
| ZMC | Highmark BCBS of Pennsylvania |
| ZMD | Anthem Bluecross of California |
| ZME | Alpha Prefix not assigned or unallocated |
| ZMF | Anthem Bluecross of California |
| ZMG | Empire BCBS of New York |
| ZMH | Highmark BCBS of Pennsylvania |
| ZMI | BCBS of Massachusetts |
| ZMJ | Anthem BCBS of Wisconsin |
| ZMK | Wellmark BCBS of South Dakota/Iowa |
| ZML | BCBS of Kansas |
| ZMM | Anthem BCBS of Nevada |
| ZMN | Alpha Prefix not assigned or unallocated |
| ZMO | Bluecross of Idaho |
| ZMP | Anthem BCBS of Wisconsin |
| ZMQ | Alpha Prefix not assigned or unallocated |
| ZMR | Empire BCBS of New York |
| ZMS | Alpha Prefix not assigned or unallocated |
| ZMT | Bluecross of Idaho |
| ZMU | Wellmark BCBS of South Dakota/Iowa |
| ZMV | BCBS of Minnesota |
| ZMW | Anthem BCBS of Ohio |
| ZMX | Anthem BCBS of Missouri |
| ZMY | Wellmark BCBS of South Dakota/Iowa |
| ZMZ | Anthem Bluecross of California |
| ZNA | Premera BCBS of Alaska |
| ZNB | Premera BCBS of Alaska |
| ZNC | Premera BCBS of Alaska |
| ZND | Wellmark BCBS of South Dakota/Iowa |
| ZNE | BCBS of Alabama |
| ZNF | Anthem Bluecross of California |
| ZNG | Wellmark BCBS of South Dakota/Iowa |
| ZNH | Bluecross of Idaho |
| ZNI | Anthem BCBS of Georgia |
| ZNJ | Premera BCBS of Alaska |
| ZNK | Premera BCBS of Alaska |
| ZNL | Anthem BCBS of Missouri |
| ZNM | Anthem BCBS of Ohio |
| ZNN | Premera BCBS of Alaska |
| ZNO | BCBS of South Carolina |
| ZNP | Premera BCBS of Alaska |
| ZNQ | Premera BCBS of Alaska |
| ZNR | BCBS of Tennessee |
| ZNS | Alpha Prefix not assigned or unallocated |
| ZNT | BCBS of Minnesota |
| ZNU | Alpha Prefix not assigned or unallocated |
| ZNV | Anthem BCBS of Missouri |
| ZNW | Premera BCBS of Alaska |
| ZNX | Alpha Prefix not assigned or unallocated |
| ZNY | Premera BCBS of Alaska |
| ZNZ | Premera BCBS of Alaska |
| ZOA | BCBS of Western New York |
| ZOB | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZOC | Blueshield of California |
| ZOD | Highmark Blueshield of Pennsylvania |
| ZOE | Anthem BCBS of Wisconsin |
| ZOF | BCBS of Michigan |
| ZOG | Highmark Blueshield of Pennsylvania |
| ZOH | BCBS of South Carolina |
| ZOI | Highmark Blueshield of Pennsylvania |
| ZOJ | Highmark Blueshield of Pennsylvania |
| ZOK | Highmark Blueshield of Pennsylvania |
| ZOL | Highmark Blueshield of Pennsylvania |
| ZOM | BCBS of South Carolina |
| ZON | Highmark BCBS of Pennsylvania |
| ZOO | BCBS of Michigan |
| ZOP | Blueshield of California |
| ZOQ | Highmark BCBS of Pennsylvania |
| ZOR | Highmark BCBS of Pennsylvania |
| ZOS | Blueshield of California |
| ZOT | Anthem Bluecross of California |
| ZOU | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZOV | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZOW | Anthem BCBS of Virginia |
| ZOX | Anthem BCBS of Virginia |
| ZOY | Anthem BCBS of Virginia |
| ZOZ | Anthem BCBS of Virginia |
| ZPA | Highmark BCBS of West Virginia |
| ZPB | Highmark BCBS of Pennsylvania |
| ZPC | Alpha Prefix not assigned or unallocated |
| ZPD | Highmark BCBS of West Virginia |
| ZPE | Highmark BCBS of West Virginia |
| ZPF | Alpha Prefix not assigned or unallocated |
| ZPG | Highmark BCBS of West Virginia |
| ZPH | Alpha Prefix not assigned or unallocated |
| ZPI | Blueshield of California |
| ZPJ | Anthem BCBS of Ohio |
| ZPK | BCBS of Illinois |
| ZPL | Wellmark BCBS of South Dakota/Iowa |
| ZPM | Highmark BCBS of Pennsylvania |
| ZPN | Highmark BCBS of West Virginia |
| ZPO | Highmark BCBS of West Virginia |
| ZPP | Highmark BCBS of West Virginia |
| ZPQ | Anthem BCBS of Ohio |
| ZPR | Wellmark BCBS of South Dakota/Iowa |
| ZPS | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| ZPT | Highmark BCBS of West Virginia |
| ZPU | Anthem Bluecross of California |
| ZPV | Anthem BCBS of Ohio |
| ZPW | Highmark BCBS of West Virginia |
| ZPX | Alpha Prefix not assigned or unallocated |
| ZPY | Anthem BCBS of Virginia |
| ZPZ | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZQA | Anthem BCBS of Ohio |
| ZQB | Wellmark BCBS of South Dakota/Iowa |
| ZQC | Alpha Prefix not assigned or unallocated |
| ZQD | BCBS of Western New York |
| ZQE | Anthem BCBS of Ohio |
| ZQF | Anthem BCBS of Ohio |
| ZQG | Blueshield of Northeastern New York |
| ZQH | Anthem BCBS of Colorado |
| ZQI | BCBS of Michigan |
| ZQJ | BCBS of Tennessee |
| ZQK | BCBS of Western New York |
| ZQL | BCBS of Tennessee |
| ZQM | Highmark BCBS of Pennsylvania |
| ZQN | Highmark BCBS of Pennsylvania |
| ZQO | Anthem BCBS of Ohio |
| ZQP | Anthem BCBS of Ohio |
| ZQQ | Anthem BCBS of Colorado |
| ZQR | Anthem BCBS of Ohio |
| ZQS | BCBS of Minnesota |
| ZQT | Alpha Prefix not assigned or unallocated |
| ZQU | Anthem Bluecross of California |
| ZQV | Anthem BCBS of Georgia |
| ZQW | BCBS of Western New York |
| ZQX | BCBS of Western New York |
| ZQY | Blueshield of Northeastern New York |
| ZQZ | Anthem BCBS of Colorado |
| ZRA | Anthem BCBS of Wisconsin |
| ZRB | Anthem BCBS of Wisconsin |
| ZRC | Anthem BCBS of Wisconsin |
| ZRD | Anthem BCBS of Nevada |
| ZRE | BCBS of Minnesota |
| ZRF | Anthem BCBS of Wisconsin |
| ZRG | Anthem BCBS of Wisconsin |
| ZRH | Anthem BCBS of Georgia |
| ZRI | Anthem BCBS of Nevada |
| ZRJ | Anthem BCBS of Georgia |
| ZRK | Premera BCBS of Alaska |
| ZRL | Premera BCBS of Alaska |
| ZRM | Wellmark BCBS of South Dakota/Iowa |
| ZRN | Anthem BCBS of Georgia |
| ZRO | Anthem BCBS of Ohio |
| ZRP | BCBS of Massachusetts |
| ZRQ | Carefirst BCBS(Maryland/District of Columbia/Northern Virginia) |
| ZRR | BCBS of Michigan |
| ZRS | BCBS of Minnesota |
| ZRT | Blueshield of California |
| ZRU | Anthem BCBS of Wisconsin |
| ZRV | Anthem BCBS of Georgia |
| ZRW | BCBS of Wyoming |
| ZRX | Anthem BCBS of Georgia |
| ZRY | Anthem BCBS of Georgia |
| ZRZ | Anthem BCBS of Georgia |
| ZSA | BCBS of Wyoming |
| ZSB | Alpha Prefix not assigned or unallocated |
| ZSC | BCBS of Wyoming |
| ZSD | BCBS of Wyoming |
| ZSE | Alpha Prefix not assigned or unallocated |
| ZSF | BCBS of Wyoming |
| ZSG | BCBS of Minnesota |
| ZSH | Alpha Prefix not assigned or unallocated |
| ZSI | Anthem Bluecross of California |
| ZSJ | Alpha Prefix not assigned or unallocated |
| ZSK | BCBS of Wyoming |
| ZSL | BCBS of Minnesota |
| ZSM | BCBS of Wyoming |
| ZSN | Highmark BCBS of Pennsylvania |
| ZSO | Highmark BCBS of Pennsylvania |
| ZSP | BCBS of Wyoming |
| ZSQ | Alpha Prefix not assigned or unallocated |
| ZSR | Highmark BCBS of Pennsylvania |
| ZSS | Wellmark BCBS of South Dakota/Iowa |
| ZST | Anthem Bluecross of California |
| ZSU | Anthem BCBS of Georgia |
| ZSV | Wellmark BCBS of South Dakota/Iowa |
| ZSW | BCBS of Minnesota |
| ZSX | Wellmark BCBS of South Dakota/Iowa |
| ZSY | BCBS of Illinois |
| ZSZ | Highmark BCBS of Pennsylvania |
| ZTA | Anthem BCBS of Kentucky |
| ZTB | Anthem BCBS of Virginia |
| ZTC | Alpha Prefix not assigned or unallocated |
| ZTD | BCBS of Alabama |
| ZTE | Alpha Prefix not assigned or unallocated |
| ZTF | Anthem Bluecross of California |
| ZTG | Anthem BCBS of New Hampshire |
| ZTH | Anthem BCBS of Virginia |
| ZTI | Blueshield of California |
| ZTJ | Anthem Bluecross of California |
| ZTK | Anthem BCBS of Missouri |
| ZTL | Anthem BCBS of Connecticut |
| ZTM | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZTN | BCBS of Texas |
| ZTO | Empire BCBS of New York |
| ZTP | Blueshield of California |
| ZTQ | Anthem Bluecross of California |
| ZTR | Alpha Prefix not assigned or unallocated |
| ZTS | Highmark BCBS of Pennsylvania |
| ZTT | Anthem BCBS of Colorado |
| ZTU | Anthem BCBS of Connecticut |
| ZTV | Anthem BCBS of Georgia |
| ZTW | Alpha Prefix not assigned or unallocated |
| ZTX | Alpha Prefix not assigned or unallocated |
| ZTY | Anthem BCBS of Georgia |
| ZTZ | BCBS of Minnesota |
| ZUA | Triple-S SALUD BCBS of Puerto Rico |
| ZUB | Wellmark BCBS of South Dakota/Iowa |
| ZUC | Anthem Bluecross of California |
| ZUD | Anthem BCBS of Nevada |
| ZUE | Alpha Prefix not assigned or unallocated |
| ZUF | Anthem BCBS of Georgia |
| ZUG | Anthem Bluecross of California |
| ZUH | Triple-S SALUD BCBS of Puerto Rico |
| ZUI | Anthem BCBS of Ohio |
| ZUJ | Anthem Bluecross of California |
| ZUK | Triple-S SALUD BCBS of Puerto Rico |
| ZUL | Anthem BCBS of Missouri |
| ZUM | Triple-S SALUD BCBS of Puerto Rico |
| ZUN | Alpha Prefix not assigned or unallocated |
| ZUO | Anthem BCBS of Missouri |
| ZUP | Blueshield of California |
| ZUQ | Anthem Bluecross of California |
| ZUR | Triple-S SALUD BCBS of Puerto Rico |
| ZUS | Triple-S SALUD BCBS of Puerto Rico |
| ZUT | Alpha Prefix not assigned or unallocated |
| ZUU | BCBS of Illinois |
| ZUV | Triple-S SALUD BCBS of Puerto Rico |
| ZUW | BCBS of Illinois |
| ZUX | Triple-S SALUD BCBS of Puerto Rico |
| ZUY | Alpha Prefix not assigned or unallocated |
| ZUZ | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVA | Alpha Prefix not assigned or unallocated |
| ZVB | BCBS of Louisiana |
| ZVC | Anthem BCBS of Indiana |
| ZVD | Anthem BCBS of Nevada |
| ZVE | BCBS of Texas |
| ZVF | Empire BCBS of New York |
| ZVG | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVH | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVI | Anthem BCBS of Ohio |
| ZVJ | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVK | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVL | Anthem BCBS of Georgia |
| ZVM | Wellmark BCBS of South Dakota/Iowa |
| ZVN | BCBS of Minnesota |
| ZVO | Anthem BCBS of Ohio |
| ZVP | Anthem BCBS of Maine |
| ZVQ | Anthem Bluecross of California |
| ZVR | Anthem BCBS of Ohio |
| ZVS | Highmark BCBS of Pennsylvania |
| ZVT | BCBS of Illinois |
| ZVU | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVV | Anthem Bluecross of California |
| ZVW | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVX | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVY | Regence BCBS(Oregon/Idaho/Utah/Washington) |
| ZVZ | Anthem BCBS of Kentucky |
| ZWA | Blueshield of Northeastern New York |
| ZWB | Blueshield of Northeastern New York |
| ZWC | Blueshield of Northeastern New York |
| ZWD | Blueshield of Northeastern New York |
| ZWE | Blueshield of Northeastern New York |
| ZWF | Blueshield of Northeastern New York |
| ZWG | Blueshield of Northeastern New York |
| ZWH | Blueshield of Northeastern New York |
| ZWI | Blueshield of Northeastern New York |
| ZWJ | BCBS of Massachusetts |
| ZWK | Blueshield of Northeastern New York |
| ZWL | Blueshield of Northeastern New York |
| ZWM | Blueshield of Northeastern New York |
| ZWN | Blueshield of Northeastern New York |
| ZWO | Alpha Prefix not assigned or unallocated |
| ZWP | Blueshield of Northeastern New York |
| ZWQ | Blueshield of Northeastern New York |
| ZWR | Blueshield of Northeastern New York |
| ZWS | Blueshield of Northeastern New York |
| ZWT | Blueshield of Northeastern New York |
| ZWU | Blueshield of Northeastern New York |
| ZWV | Blueshield of Northeastern New York |
| ZWW | Blueshield of Northeastern New York |
| ZWX | Blueshield of Northeastern New York |
| ZWY | Blueshield of Northeastern New York |
| ZWZ | Blueshield of Northeastern New York |
| ZXA | BCBS of Tennessee |
| ZXB | BCBS of Tennessee |
| ZXC | Anthem BCBS of Ohio |
| ZXD | BCBS of Tennessee |
| ZXE | BCBS of Tennessee |
| ZXF | Alpha Prefix not assigned or unallocated |
| ZXG | BCBS of Tennessee |
| ZXH | BCBS of Tennessee |
| ZXI | Anthem BCBS of Ohio |
| ZXJ | Premera BCBS of Alaska |
| ZXK | BCBS of Tennessee |
| ZXL | Premera BCBS of Alaska |
| ZXM | Alpha Prefix not assigned or unallocated |
| ZXN | Premera BCBS of Alaska |
| ZXO | Anthem BCBS of Ohio |
| ZXP | BCBS of Tennessee |
| ZXQ | BCBS of Western New York |
| ZXR | BCBS of Tennessee |
| ZXS | BCBS of Tennessee |
| ZXT | BCBS of Western New York |
| ZXU | Premera BCBS of Alaska |
| ZXV | BCBS of Tennessee |
| ZXW | Anthem BCBS of New Hampshire |
| ZXX | BCBS of Tennessee |
| ZXY | BCBS of Tennessee |
| ZXZ | Premera BCBS of Alaska |
| ZYA | Wellmark BCBS of South Dakota/Iowa |
| ZYB | Empire BCBS of New York |
| ZYC | Alpha Prefix not assigned or unallocated |
| ZYD | Empire BCBS of New York |
| ZYE | Empire BCBS of New York |
| ZYF | Anthem Bluecross of California |
| ZYG | Wellmark BCBS of South Dakota/Iowa |
| ZYH | Wellmark BCBS of South Dakota/Iowa |
| ZYI | Anthem Bluecross of California |
| ZYJ | Empire BCBS of New York |
| ZYK | Empire BCBS of New York |
| ZYL | Empire BCBS of New York |
| ZYM | Wellmark BCBS of South Dakota/Iowa |
| ZYN | Wellmark BCBS of South Dakota/Iowa |
| ZYO | Anthem Bluecross of California |
| ZYP | Anthem BCBS of Missouri |
| ZYQ | Anthem BCBS of Ohio |
| ZYR | Wellmark BCBS of South Dakota/Iowa |
| ZYS | Wellmark BCBS of South Dakota/Iowa |
| ZYT | BCBS of Minnesota |
| ZYU | BCBS of Illinois |
| ZYV | Wellmark BCBS of South Dakota/Iowa |
| ZYW | BCBS of Wyoming |
| ZYX | Wellmark BCBS of South Dakota/Iowa |
| ZYY | Anthem BCBS of Missouri |
| ZYZ | Wellmark BCBS of South Dakota/Iowa |
| ZZA | BCBS of Minnesota |
| ZZB | Wellmark BCBS of South Dakota/Iowa |
| ZZC | Anthem BCBS of Indiana |
| ZZD | Anthem Bluecross of California |
| ZZE | Anthem Bluecross of California |
| ZZF | Anthem Bluecross of California |
| ZZG | Anthem BCBS of New Hampshire |
| ZZH | Anthem BCBS of Indiana |
| ZZI | Blueshield of California |
| ZZJ | BCBS of Tennessee |
| ZZK | Anthem BCBS of Ohio |
| ZZL | BCBS of Minnesota |
| ZZM | Premera BCBS of Alaska |
| ZZN | Premera BCBS of Alaska |
| ZZO | Anthem Bluecross of California |
| ZZP | Premera BCBS of Alaska |
| ZZQ | Premera BCBS of Alaska |
| ZZR | Premera BCBS of Alaska |
| ZZS | Highmark BCBS of Pennsylvania |
| ZZT | BCBS of Texas |
| ZZU | BCBS of Minnesota |
| ZZV | Premera BCBS of Alaska |
| ZZW | Premera BCBS of Alaska |
| ZZX | Alpha Prefix not assigned or unallocated |
| ZZY | Premera BCBS of Alaska |
| ZZZ | Anthem Bluecross of California |