| GAA GAI GAL GAR GAV GAX GBK GBL GBO GBP GBY GCB GCH GCK GCM GCN GCO GCP GCS GCY GCZ GDJ GDO GDR GDX GEB GEF GEK GEL GEQ GER GEW GEY GFH GFK GFN GFO GFS GFW GFY GGE GGJ GGU GGY GHB GHC GHH GHL GHT GIN GIR GIV GIX GIY GIZ GJA GJE GJF GJG GJL GJR GJU GJW GKC GKE GKH GKS GLD GLM GLP GLU GMR GNB GND GNG GNH GNL GNM GNP GNZ GOC GON GOT GOV GOW GOY GOZ GPQ GPX GQG GQL GQN GQO GQQ GQR GQW GQY GRG GRL GRN GRO GRR GRS GRX GSB GSG GTG GTL GTM GTQ GTT GTX GTY GUB GUE GUN GUO GUT GVK GVO GVP GVT GVU GVV GWF GWN GWT GWV GWW GXF GXI GXO GXS GYA GYB GYD GYE GYG GYI GYJ GYN GYX GZA GZC GZH GZN GZU GZW | Alpha Prefix not assigned or unallocated |
| GDE GMW GVC | Anthem Blue Cross Blue Shield of Colorado |
| GKP GMT GTU | Anthem Blue Cross Blue Shield of Connecticut |
| GAN GAP GAQ GBB GBM GCT GDH GEH GFA GFM GFQ GGC GGF GGG GGW GHW GIT GJN GKA GKU GLE GLH GLJ GLL GLY GMG GMO GNN GNT GOH GQD GQU GQV GSP GTS GTV GTW GUK GVA GVG GVH GVR GWQ GXJ GXT GYO GYW | Anthem Blue Cross Blue Shield of Georgia |
| GJB GKV GPN GPW GSH GSJ GUU GUV GUX GVB | Anthem Blue Cross Blue Shield of Indiana |
| GEI GHI GMM | Anthem Blue Cross Blue Shield of Kentucky |
| GBQ GBR GSX GZK | Anthem Blue Cross Blue Shield of Missouri |
| GXA GYZ GZL | Anthem Blue Cross Blue Shield of Nevada |
| GJX | Anthem Blue Cross Blue Shield of New Hampshire |
| GAY GBT GCQ GCU GDQ GDV GEG GFE GFR GGL GHF GIL GJQ GKY GLX GMD GML GPM GQH GQZ GRD GRT GRU GRY GSV GTF GVD GWP GYC GYR | Anthem Blue Cross Blue Shield of Ohio |
| GAZ GDC GEV GJD GMA GQE GTJ GWE GYV | Anthem Blue Cross Blue Shield of Virginia |
| GHA GPJ GQP GUS GWI GYL GZY | Anthem Blue Cross Blue Shield of Wisconsin |
| GAE GBU GCD GCF GDB GDD GEO GES GFB GFF GGQ GGS GIC GIE GJI GJO GLB GLN GLS GOR GQC GQF GRA GRB GTB GUI GVN GYQ GZB | Anthem Bluecross of California |
| GAS GEJ GGV GJC GXH | Arkansas Blue Cross Blue Shield |
| GAT GCA GCX GEC GEN GEP GEX GID GIS GKD GKN GPT GRJ GRK GSW GVW GWM GZF | Blue Cross Blue Shield of Alabama |
| GGI GHU GLK | Blue Cross Blue Shield of Arizona |
| GAC GAF GBF GBH GBW GBX GDU GEU GFL GGZ GHN GHX GJP GKX GLW GMB GMK GMS GNR GNV GRF GRW GTH GUF GUW GUY GVX GWK GWY GXC GYH GZR | Blue Cross Blue Shield of Illinois |
| GKF GPS GXV | Blue Cross Blue Shield of Kansas City |
| GCL GIG GOO GQI | Blue Cross Blue Shield of Louisiana |
| GAB GAK GAO GAW GHR GIA GLZ GME GNK GOB GPL GQK GRH GTC GTE GTI GVS GVZ GXB GXR GYS GZJ GZP | Blue Cross Blue Shield of Massachusetts |
| GBE GBG GDL GDN GFP GGO GHP GIH GIJ GIM GIQ GKI GKO GLC GLG GLT GMC GMH GMJ GMQ GMU GMV GNC GNO GNY GOA GPB GRV GTP GUA GUC GUR GUZ GVJ GVL GXN GXU GXX GYT GYY GZD GZO | Blue Cross Blue Shield of Michigan |
| GBS GEZ GGP GHJ GKG GKQ GKR GLR GMI GNX GRC GRP GWX GXZ GYF GYP GZT GZX | Blue Cross Blue Shield of Minnesota |
| GBA | Blue Cross Blue Shield of Montana |
| GJH GPF GUP GXP | Blue Cross Blue Shield of Nebraska |
| GDK GFJ GIU GNE GOD GPA GSK GUM | Blue Cross Blue Shield of North Carolina |
| GNF GYK | Blue Cross Blue Shield of Oklahoma |
| GBD | Blue Cross Blue Shield of Rhode Island |
| GBZ GFC GIP GNS GQB GQT GSD GSM GSS GTK GUQ | Blue Cross Blue Shield of South Carolina |
| GIB GIO GRQ GWD | Blue Cross Blue Shield of Tennessee |
| GAG GAM GFX GHG GHM GHV GMZ GSA GSR GST GSY | Blue Cross Blue Shield of Texas |
| GCV GDA GDI GDY GHQ GIF GIK GIW GSE GXW GZG GZQ | Blue Cross Blue Shield of Western New York |
| GLI GMF GMX GMY GSL GTD GWO GWU | Bluecross of Idaho |
| GAD GBI GCG GCI GEE GGB GGD GLQ GLV GPE GPG GRI GSF GSU GWA GWH GWS GXY GYM | Blueshield of California |
| GQX | Blueshield of Northeastern New York |
| GAU GCC GCE GDG GDP GDZ GEM GFI GFV GHZ GJK GJT GJY GJZ GKB GKT GLF GNJ GOG GOK GOM GOQ GPO GPV GPY GQM GSI GSO GTA GTZ GUH GXK GZE | Carefirst Blue Cross Blue Shield(Maryland/District of Columbia/Northern Virginia) |
| GCJ GDS GFZ GGN GJM GJS GNQ GPR | Empire Blue Cross Blue Shield of New York |
| GAH GHS | Excellus Blue Cross Blue Shield of New York |
| GHK GJV GLA GMN GMP GNW GOP GPC GPZ GUG GWC GWR GZI | Florida Blue |
| GBJ GBN GDM GGA GGM GGT GKM GSC GSQ GVE GWG GXG GXM GYU | Highmark Blue Cross Blue Shield of Pennsylvania |
| GUL GWB | Horizon Blue Cross Blue Shield of New Jersey |
| GEA GED GHO GII GJJ GKJ GKK GLO GOF GOL GPI GPU GSN GTO GVF GVI GZM | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| GDF GFU GHD GOU GQJ GTN GUJ GVQ GVY GWJ | Premera Blue Cross Blue Shield of Alaska |
| GHE GKZ GNI GOE GQA GQS GXQ GZS GZZ | Regence Blue Cross Blue Shield(Oregon/Idaho/Utah/Washington) |
| GAJ GBC GBV GCR GCW GDT GDW GET GFG GFT GGH GGK GGX GHY GKL GKW GNA GNU GOI GOS GOX GPD GPH GPK GPP GRE GRM GRZ GTR GUD GVM GWL GWZ GXD GXE GXL GZV | Wellmark Blue Cross Blue Shield of South Dakota/Iowa |