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