| FAA | Anthem Blue Cross Blue Shield of Ohio |
| FAB | Blue Cross Blue Shield of Alabama |
| FAC | Blue Cross Blue Shield of Vermont |
| FAD | Blue Cross Blue Shield of Illinois |
| FAE | Blue Cross Blue Shield of Rhose Island |
| FAF | Carefirst Blue Cross Blue Shield of Maryland |
| FAG | No Prefix Assigned |
| FAH | Blue Cross Blue Shield of Vermont |
| FAI | Anthem Blue Cross of California |
| FAJ | Anthem Blue Cross Blue Shield of Georgia |
| FAK | Anthem Blue Cross Blue Shield of Georgia |
| FAL | Anthem Blue Cross of California |
| FAM | Wellmark BCBS |
| FAN | Blue Shield of California |
| FAO | Blue Cross Blue Shield of Vermont |
| FAP | Anthem Blue Cross Blue Shield of Virginia |
| FAQ | Blue Cross Blue Shield of North Carolina |
| FAR | Anthem Blue Cross of California |
| FAS | Anthem Blue Cross of California |
| FAT | No Prefix Assigned |
| FAU | Anthem Blue Cross Blue Shield of Virginia |
| FAV | Anthem Blue Cross Blue Shield of Ohio |
| FAW | Blue Cross Blue Shield of Georgia |
| FAX | Blue Cross Blue Shield of Illinois |
| FAY | Blue Cross Blue Shield of Georgia |
| FAZ | Blue Cross Blue Shield of South Carolina |
| FBA | Blue Cross Blue Shield of Western New York |
| FBB | Anthem Blue Cross of California |
| FBC | Wellmark BCBS |
| FBD | Anthem Blue Cross Blue Shield of Ohio |
| FBE | No Prefix Assigned |
| FBF | Anthem Blue Cross Blue Shield of Georgia |
| FBG | Blue Cross Blue Shield of Minnesota |
| FBH | Blue Cross Blue Shield of Florida |
| FBI | Blue Cross Blue Shield of Alabama |
| FBJ | Anthem Blue Cross Blue Shield of Ohio |
| FBK | Capital Blue Cross |
| FBL | Blue Cross Blue Shield of Georgia |
| FBM | Blue Cross Blue Shield of Kansas City |
| FBN | Blue Cross Blue Shield of South Carolina |
| FBO | Blue Cross Blue Shield of Minnesota |
| FBP | Blue Cross Blue Shield of Michigan |
| FBQ | Blue Cross Blue Shield of Nebraska |
| FBR | Blue Cross Blue Shield of Illinois |
| FBS | Blue Cross Blue Shield of Florida |
| FBT | Regence BCBS |
| FBU | No Prefix Assigned |
| FBV | No Prefix Assigned |
| FBW | Blue Cross Blue Shield of Illinois |
| FBX | Anthem Blue Cross Blue Shield of Missouri |
| FBY | Blue Cross Blue Shield of Arkansas |
| FBZ | Blue Cross Blue Shield of Michigan |
| FCA | Anthem Blue Cross Blue Shield of Ohio |
| FCB | No Prefix Assigned |
| FCC | Blue Cross Blue Shield of Illinois |
| FCD | Blue Cross Blue Shield of Illinois |
| FCE | Blue Cross Blue Shield of Kansas City |
| FCF | Carefirst Blue Cross Blue Shield of Maryland |
| FCG | Blue Cross Blue Shield of Arkansas Blue Advantage |
| FCH | Blue Cross Blue Shield of South Carolina |
| FCI | Blue Cross Blue Shield of Minnesota |
| FCJ | Blue Cross of Idaho |
| FCK | No Prefix Assigned |
| FCL | Blue Cross Blue Shield of Nebraska |
| FCM | Wellmark BCBS |
| FCN | Carefirst Blue Cross Blue Shield of Maryland |
| FCO | Blue Cross Blue Shield of South Carolina |
| FCP | Capital Blue Cross |
| FCQ | Blue Cross Blue Shield of Minnesota |
| FCR | Empire Blue Cross Blue Shield of New York |
| FCS | Blue Cross Blue Shield of Illinois |
| FCT | Anthem Blue Cross Blue Shield of Nevada |
| FCU | Blue Cross Blue Shield of Illinois |
| FCV | No Prefix Assigned |
| FCW | Blue Cross Blue Shield of Michigan |
| FCX | Blue Cross Blue Shield of Alabama |
| FCY | Anthem Blue Cross Blue Shield of Michigan |
| FCZ | Blue Cross Blue Shield of South Carolina |
| FDA | Blue Cross Blue Shield of Michigan |
| FDB | Blue Cross Blue Shield of Michigan |
| FDC | Blue Cross Blue Shield of Illinois |
| FDD | Empire Blue Cross Blue Shield of New York |
| FDE | Blue Cross Blue Shield of Illinois |
| FDF | Highmark BCBS |
| FDG | Blue Cross Blue Shield of Illinois |
| FDH | Highmark BCBS |
| FDI | Blue Shield of California |
| FDJ | Blue Cross Blue Shield of Florida |
| FDK | Anthem Blue Cross Blue Shield of Georgia |
| FDL | Blue Cross Blue Shield of South Carolina |
| FDM | Empire Blue Cross Blue Shield of New York |
| FDN | Wellmark BCBS |
| FDO | Blue Cross Blue Shield of North Carolina |
| FDP | Regence Blue Cross Blue Shield of Oregon |
| FDQ | Wellmark BCBS |
| FDR | Blue Cross Blue Shield of Georgia |
| FDS | Anthem Blue Cross of California |
| FDT | Empire Blue Cross Blue Shield of New York |
| FDU | Anthem Blue Cross Blue Shield of Ohio |
| FDV | Highmark BCBS |
| FDW | Anthem Blue Cross Blue Shield of Colorado |
| FDX | Blue Cross Blue Shield of Tennessee |
| FDY | No Prefix Assigned |
| FDZ | Blue Shield of California |
| FEA | Blue Cross Blue Shield of South Carolina |
| FEB | Blue Cross Blue Shield of Kansas City |
| FEC | Anthem Blue Cross Blue Shield of Virginia |
| FED | Carefirst Blue Cross Blue Shield of Maryland |
| FEE | Blue Cross Blue Shield of Florida |
| FEF | Anthem Blue Cross Blue Shield of Indiana |
| FEG | Carefirst Blue Cross Blue Shield of Maryland |
| FEH | Highmark BCBS |
| FEI | Regence Blue Cross Blue Shield of Oregon |
| FEJ | Anthem Blue Cross Blue Shield of Missouri |
| FEK | Blue Cross Blue Shield of Alabama |
| FEL | Anthem Blue Cross of California |
| FEM | Highmark BCBS |
| FEN | No Prefix Assigned |
| FEO | Horizon Blue Cross Blue Shield of New Jersey |
| FEP | No Prefix Assigned |
| FEQ | Carefirst Blue Cross Blue Shield of Maryland |
| FER | Highmark BCBS |
| FES | Highmark BCBS |
| FET | Blue Cross Blue Shield of Michigan |
| FEU | Carefirst Blue Cross Blue Shield of Maryland |
| FEV | No Prefix Assigned |
| FEW | Anthem Blue Cross of California |
| FEX | Anthem Blue Cross of California |
| FEY | Blue Cross Blue Shield of Georgia |
| FEZ | Anthem Blue Cross Blue Shield of Ohio |
| FFA | Blue Cross Blue Shield of Michigan |
| FFB | Blue Cross Blue Shield of Nebraska |
| FFC | Highmark BCBS |
| FFD | Blue Cross Blue Shield of South Carolina |
| FFE | Anthem Blue Cross Blue Shield of Georgia |
| FFF | Blue Cross Blue Shield of Minnesota |
| FFG | Wellmark BCBS |
| FFH | Blue Cross Blue Shield of Massachusetts |
| FFI | Independence Blue Cross |
| FFJ | Blue Cross Blue Shield of Georgia |
| FFK | Blue Cross Blue Shield of South Carolina |
| FFL | Wellmark BCBS |
| FFM | Blue Cross Blue Shield of Texas |
| FFN | Blue Cross Blue Shield of Oklahoma |
| FFO | Anthem Blue Cross Blue Shield of Georgia |
| FFP | Blue Cross Blue Shield of Tennessee |
| FFQ | Blue Cross Blue Shield of Illinois |
| FFR | Highmark BCBS |
| FFS | Anthem Blue Cross of California |
| FFT | Blue Cross Blue Shield of Tennessee |
| FFU | Blue Cross Blue Shield of Florida |
| FFV | Anthem Blue Cross Blue Shield of Missouri |
| FFW | Anthem Blue Cross Blue Shield of Colorado |
| FFX | Anthem Blue Cross of California |
| FFY | Regence Blue Cross Blue Shield of Oregon |
| FFZ | Blue Cross Blue Shield of Texas |
| FGA | No Prefix Assigned |
| FGB | Anthem Blue Cross Blue Shield of Wisconsin |
| FGC | Blue Cross Blue Shield of Massachusetts |
| FGD | Anthem Blue Cross Blue Shield of Ohio |
| FGE | Blue Cross Blue Shield of South Carolina |
| FGF | Blue Cross Blue Shield of Minnesota |
| FGG | Blue Cross Blue Shield of Florida |
| FGH | Blue Cross Blue Shield of Minnesota |
| FGI | Anthem Blue Cross Blue Shield of Ohio |
| FGJ | Anthem Blue Cross Blue Shield of Indiana |
| FGK | Carefirst Blue Cross Blue Shield of Maryland |
| FGL | Blue Cross Blue Shield of Texas |
| FGM | Anthem Blue Cross of California |
| FGN | Anthem Blue Cross Blue Shield of Georgia |
| FGO | Anthem Blue Cross of California |
| FGP | Blue Cross Blue Shield of Michigan |
| FGQ | Blue Cross Blue Shield of South Carolina |
| FGR | Blue Cross Blue Shield of Alabama |
| FGS | Blue Cross Blue Shield of Michigan |
| FGT | Highmark BCBS |
| FGU | Blue Cross Blue Shield of Michigan |
| FGV | Anthem Blue Cross Blue Shield of Ohio |
| FGW | Blue Cross Blue Shield of Alabama |
| FGX | Blue Shield of Northeastern New York |
| FGY | Wellmark BCBS |
| FGZ | Anthem Blue Cross Blue Shield of Missouri |
| FHA | Blue Cross Blue Shield of Illinois |
| FHB | Blue Cross Blue Shield of Massachusetts |
| FHC | Blue Cross Blue Shield of Michigan |
| FHD | Blue Cross Blue Shield of Nebraska |
| FHE | Blue Cross Blue Shield of Nebraska |
| FHF | Carefirst Blue Cross Blue Shield of Maryland |
| FHG | Wellmark BCBS |
| FHH | Blue Cross Blue Shield of Massachusetts |
| FHI | Blue Cross Blue Shield of Michigan |
| FHJ | Blue Cross Blue Shield of Florida |
| FHK | Blue Shield of California |
| FHL | Blue Cross Blue Shield of Illinois |
| FHM | Anthem Blue Cross Blue Shield of Ohio |
| FHN | Blue Cross Blue Shield of Michigan |
| FHO | Anthem Blue Cross Blue Shield of Ohio |
| FHP | Anthem Blue Cross Blue Shield of Georgia |
| FHQ | Anthem Blue Cross Blue Shield of Missouri |
| FHR | Highmark BCBS |
| FHS | Blue Cross of Idaho |
| FHT | Regence BCBS |
| FHU | Premera Blue Cross |
| FHV | Wellmark BCBS |
| FHW | Blue Cross Blue Shield of Florida |
| FHX | Blue Cross Blue Shield of Minnesota |
| FHY | Blue Cross Blue Shield of Massachusetts |
| FHZ | Blue Shield of California |
| FIA | Anthem Blue Cross Blue Shield of Wisconsin |
| FIB | Blue Cross Blue Shield of Massachusetts |
| FIC | Anthem Blue Cross Blue Shield of Georgia |
| FID | Blue Cross Blue Shield of Nebraska |
| FIE | Blue Cross Blue Shield of Michigan |
| FIF | Highmark BCBS |
| FIG | Blue Cross Blue Shield of Tennessee |
| FIH | Blue Cross Blue Shield of Tennessee |
| FII | Blue Cross Blue Shield of Alabama |
| FIJ | Blue Cross Blue Shield of Michigan |
| FIK | Wellmark BCBS |
| FIL | Blue Cross Blue Shield of Michigan |
| FIM | Wellmark BCBS |
| FIN | Anthem Blue Cross Blue Shield of Ohio |
| FIO | Blue Cross Blue Shield of Michigan |
| FIP | Blue Cross of Idaho |
| FIQ | Blue Cross Blue Shield of Michigan |
| FIR | Premera Blue Cross |
| FIS | Blue Cross Blue Shield of North Carolina |
| FIT | Premera Blue Cross |
| FIU | Blue Cross Blue Shield of Michigan |
| FIV | Anthem Blue Cross Blue Shield of Colorado |
| FIW | No Prefix Assigned |
| FIX | Anthem Blue Cross Blue Shield of Ohio |
| FIY | Anthem Blue Cross Blue Shield of Wisconsin |
| FIZ | Blue Cross Blue Shield of Florida |
| FJA | Anthem Blue Cross Blue Shield of Georgia |
| FJB | Anthem Blue Cross Blue Shield of Georgia |
| FJC | Blue Cross Blue Shield of Illinois |
| FJD | Anthem Blue Cross Blue Shield of Georgia |
| FJE | Anthem Blue Cross Blue Shield of Georgia |
| FJF | Anthem Blue Cross Blue Shield of Georgia |
| FJG | No Prefix Assigned |
| FJH | Regence Blue Cross Blue Shield of Utah |
| FJI | Wellmark BCBS |
| FJJ | Anthem Blue Cross of California |
| FJK | No Prefix Assigned |
| FJL | Blue Cross Blue Shield of Nebraska |
| FJM | Independence Blue Cross |
| FJN | Blue Cross Blue Shield of Illinois |
| FJO | Independence Blue Cross |
| FJP | Blue Cross Blue Shield of Minnesota |
| FJQ | Anthem Blue Cross Blue Shield of Georgia |
| FJR | Highmark BCBS |
| FJS | Blue Cross Blue Shield of Massachusetts |
| FJT | Blue Cross Blue Shield of Tennessee |
| FJU | Anthem Blue Cross Blue Shield of Georgia |
| FJV | Anthem Blue Cross Blue Shield of Georgia |
| FJW | Blue Cross Blue Shield of Rhose Island |
| FJX | Anthem Blue Cross Blue Shield of Georgia |
| FJY | Wellmark BCBS |
| FJZ | Anthem Blue Cross of California |
| FKA | Blue Cross Blue Shield of Illinois |
| FKB | Carefirst Blue Cross Blue Shield of Maryland |
| FKC | No Prefix Assigned |
| FKD | Wellmark BCBS |
| FKE | Blue Cross Blue Shield of Michigan |
| FKF | Blue Cross Blue Shield of Louisiana |
| FKG | No Prefix Assigned |
| FKH | No Prefix Assigned |
| FKI | Carefirst Blue Cross Blue Shield of Maryland |
| FKJ | No Prefix Assigned |
| FKK | Premera Blue Cross |
| FKL | Carefirst Blue Cross Blue Shield of Maryland |
| FKM | Highmark BCBS |
| FKN | Highmark BCBS |
| FKO | Blue Cross Blue Shield of South Carolina |
| FKP | Anthem Blue Cross of California |
| FKQ | Capital Blue Cross |
| FKR | Anthem Blue Cross of California |
| FKS | Anthem Blue Cross Blue Shield of Georgia |
| FKT | Blue Cross Blue Shield of Minnesota |
| FKU | Blue Cross Blue Shield of Louisiana |
| FKV | Wellmark BCBS |
| FKW | Blue Cross Blue Shield of North Carolina |
| FKX | Carefirst Blue Cross Blue Shield of Maryland |
| FKY | Blue Cross Blue Shield of Louisiana |
| FKZ | Carefirst Blue Cross Blue Shield of Maryland |
| FLA | Anthem Blue Cross Blue Shield of Georgia |
| FLB | Blue Cross Blue Shield of Minnesota |
| FLC | No Prefix Assigned |
| FLD | Wellmark BCBS |
| FLE | Blue Cross Blue Shield of Minnesota |
| FLF | Blue Cross Blue Shield of North Carolina |
| FLG | Blue Cross Blue Shield of South Carolina |
| FLH | Blue Cross Blue Shield of Arizona |
| FLI | Blue Cross Blue Shield of Georgia |
| FLJ | Blue Cross Blue Shield of Nebraska |
| FLK | Blue Cross Blue Shield of Illinois |
| FLL | Blue Cross of California |
| FLM | Wellmark BCBS |
| FLN | Blue Shield of Northeastern New York |
| FLO | Anthem Blue Cross Blue Shield of Georgia |
| FLP | Horizon Blue Cross Blue Shield of New Jersey |
| FLQ | Blue Cross Blue Shield of South Carolina |
| FLR | Blue Cross Blue Shield of Minnesota |
| FLS | Anthem Blue Cross Blue Shield of Georgia |
| FLT | Blue Cross Blue Shield of South Carolina |
| FLU | No Prefix Assigned |
| FLV | Blue Cross Blue Shield of Texas |
| FLW | Anthem Blue Cross Blue Shield of Colorado |
| FLX | Wellmark BCBS |
| FLY | Antehm Blue Cross Blue Shield of Georgia |
| FLZ | Anthem Blue Cross of California |
| FMA | Blue Cross Blue Shield of Michigan |
| FMB | Blue Cross Blue Shield of Illinois |
| FMC | Blue Cross Blue Shield of Massachusetts |
| FMD | Blue Cross Blue Shield of Massachusetts |
| FME | Blue Cross of Idaho |
| FMF | Blue Cross Blue Shield of Illinois |
| FMG | Blue Cross Blue Shield of Minnesota |
| FMH | Carefirst Blue Cross Blue Shield of Maryland |
| FMI | Blue Shield of California |
| FMJ | Empire Blue Cross Blue Shield of New York |
| FMK | Carefirst Administrators |
| FML | Blue Cross Blue Shield of Michigan |
| FMM | Blue Cross Blue Shield of Michigan |
| FMN | Anthem Blue Cross Blue Shield of Virginia |
| FMO | Blue Cross Blue Shield of Alabama |
| FMP | No Prefix Assigned |
| FMQ | No Prefix Assigned |
| FMR | Premera Blue Cross |
| FMS | Blue Cross Blue Shield of Texas |
| FMT | Blue Cross Blue Shield of Illinois |
| FMU | Blue Cross Blue Shield of Massachusetts |
| FMV | Blue Cross Blue Shield of Michigan |
| FMW | Regence Blue Shield of Idaho |
| FMX | Blue Cross Blue Shield of Minnesota |
| FMY | Blue Cross Blue Shield of Georgia |
| FMZ | No Prefix Assigned |
| FNA | Blue Cross Blue Shield of Texas |
| FNB | Anthem Blue Cross Blue Shield of Georgia |
| FNC | Blue Cross Blue Shield of Texas |
| FND | Blue Cross Blue Shield of Michigan |
| FNE | Anthem Blue Cross Blue Shield of Ohio |
| FNF | Carefirst Blue Cross Blue Shield of Maryland |
| FNG | Blue Cross Blue Shield of Illinois |
| FNH | No Prefix Assigned |
| FNI | Carefirst Blue Cross Blue Shield of Maryland |
| FNJ | Anthem Blue Cross Blue Shield of Ohio |
| FNK | No Prefix Assigned |
| FNL | Blue Cross Blue Shield of Minnesota |
| FNM | Blue Cross Blue Shield of Massachusetts |
| FNN | Regence BCBS |
| FNO | Blue Cross Blue Shield of North Carolina |
| FNP | No Prefix Assigned |
| FNQ | Anthem Blue Cross of California |
| FNR | Anthem Blue Cross Blue Shield of Kentucky |
| FNS | Anthem Blue Cross of California |
| FNT | Blue Cross Blue Shield of Nebraska |
| FNU | Blue Cross Blue Shield of Michigan |
| FNV | Anthem Blue Cross Blue Shield of Georgia |
| FNW | Blue Cross Blue Shield of Georgia |
| FNX | Anthem Blue Cross of California |
| FNY | Blue Cross Blue Shield of Nebraska |
| FNZ | Blue Cross Blue Shield of Illinois |
| FOA | Premera Blue Cross |
| FOB | Blue Cross Blue Shield of Florida |
| FOC | Blue Shield of California |
| FOD | Blue Cross Blue Shield of South Carolina |
| FOE | Blue Cross Blue Shield of Massachusetts |
| FOF | Wellmark BCBS |
| FOG | Blue Cross Blue Shield of Minnesota |
| FOH | Blue Cross Blue Shield of South Carolina |
| FOI | Blue Cross Blue Shield of Western New York |
| FOJ | Independence Blue Cross |
| FOK | Blue Cross Blue Shield of South Carolina |
| FOL | Anthem Blue Cross of California |
| FOM | Carefirst Blue Cross Blue Shield of Maryland |
| FON | Blue Cross Blue Shield of South Carolina |
| FOO | Blue Shield of California |
| FOP | Blue Cross Blue Shield of Minnesota |
| FOQ | No Prefix Assigned |
| FOR | Anthem Blue Cross Blue Shield of Ohio |
| FOS | Anthem Blue Cross Blue Shield of Virginia |
| FOT | Carefirst Blue Cross Blue Shield of Maryland |
| FOU | Blue Cross Blue Shield of Alabama |
| FOV | Horizon Blue Cross Blue Shield of New Jersey |
| FOW | Anthem Blue Cross Blue Shield of Colorado |
| FOX | Blue Cross Blue Shield of Illinois |
| FOY | Blue Cross Blue Shield of Oklahoma |
| FOZ | No Prefix Assigned |
| FPA | Blue Cross Blue Shield of South Carolina |
| FPB | Blue Cross Blue Shield of Alabama |
| FPC | Blue Cross Blue Shield of Illinois |
| FPD | Anthem Blue Cross of California |
| FPE | Wellmark BCBS |
| FPF | Anthem Blue Cross of California |
| FPG | Carefirst Administrators |
| FPH | Carefirst Blue Cross Blue Shield of Maryland |
| FPI | Anthem Blue Cross of California |
| FPJ | Highmark BCBS |
| FPK | Blue Shield of California |
| FPL | Wellmark BCBS |
| FPM | Blue Cross Blue Shield of Michigan |
| FPN | Blue Cross Blue Shield of Texas |
| FPO | Wellmark BCBS |
| FPP | Blue Cross Blue Shield of Western New York |
| FPQ | Highmark BCBS |
| FPR | Highmark BCBS |
| FPS | Blue Cross Blue Shield of Alabama |
| FPT | Blue Cross Blue Shield of North Carolina |
| FPU | Carefirst Blue Cross Blue Shield of Maryland |
| FPV | Blue Shield of California |
| FPW | Carefirst Blue Cross Blue Shield of Maryland |
| FPX | Carefirst Administrators |
| FPY | Blue Cross Blue Shield of Illinois |
| FPZ | Anthem Blue Cross of California |
| FQA | Blue Cross Blue Shield of Louisiana |
| FQB | No Prefix Assigned |
| FQC | Blue Cross Blue Shield of South Carolina |
| FQD | No Prefix Assigned |
| FQE | Blue Cross Blue Shield of Nebraska |
| FQF | Blue Cross Blue Shield of Minnesota |
| FQG | No Prefix Assigned |
| FQH | Anthem Blue Cross Blue Shield of Georgia |
| FQI | Anthem Blue Cross Blue Shield of Georgia |
| FQJ | Anthem Blue Cross Blue Shield of Colorado |
| FQK | Blue Cross Blue Shield of South Carolina |
| FQL | Blue Cross Blue Shield of Arizona |
| FQM | Independence Blue Cross |
| FQN | Blue Cross Blue Shield of Illinois |
| FQO | Carefirst Blue Cross Blue Shield of Maryland |
| FQP | Blue Cross Blue Shield of Minnesota |
| FQQ | Carefirst Blue Cross Blue Shield of Maryland |
| FQR | Blue Cross Blue Shield of Massachusetts |
| FQS | No Prefix Assigned |
| FQT | Wellmark BCBS |
| FQU | Independence Blue Cross |
| FQV | Blue Shield of California |
| FQW | Blue Cross Blue Shield of Louisiana |
| FQX | Wellmark BCBS |
| FQY | Wellmark BCBS |
| FQZ | Blue Cross Blue Shield of Minnesota |
| FRA | Blue Cross Blue Shield of South Carolina |
| FRB | Blue Cross Blue Shield of Illinois |
| FRC | Wellmark BCBS |
| FRD | Anthem Blue Cross Blue Shield of Virginia |
| FRE | Premera Blue Cross |
| FRF | Carefirst Blue Cross Blue Shield of Maryland |
| FRG | Blue Cross Blue Shield of Texas |
| FRH | Anthem Blue Cross Blue Shield of Wisconsin |
| FRI | Blue Shield of California |
| FRJ | Premera Blue Cross Blue Shield of Alaska |
| FRK | Anthem Blue Cross of California |
| FRL | Blue Shield of California |
| FRM | Anthem Blue Cross Blue Shield of Ohio |
| FRN | Blue Cross Blue Shield of Texas |
| FRO | Blue Cross Blue Shield of Michigan |
| FRP | Carefirst Blue Cross Blue Shield of Maryland |
| FRQ | Blue Cross Blue Shield of Michigan |
| FRR | Blue Cross Blue Shield of South Carolina |
| FRS | Blue Cross Blue Shield of Massachusetts |
| FRT | Anthem Blue Cross of California |
| FRU | No Prefix Assigned |
| FRV | Blue Cross Blue Shield of Alabama |
| FRW | Anthem Blue Cross Blue Shield of Missouri |
| FRX | Anthem Blue Cross of California |
| FRY | Blue Shield of California |
| FRZ | Blue Cross Blue Shield of Tennessee |
| FSA | Blue Cross Blue Shield of Massachusetts |
| FSB | Anthem Blue Cross Blue Shield of Wisconsin |
| FSC | Independence Blue Cross |
| FSD | Blue Cross Blue Shield of South Carolina |
| FSE | Anthem Blue Cross Blue Shield of Ohio |
| FSF | Empire Blue Cross Blue Shield of New York |
| FSG | Blue Cross Blue Shield of Illinois |
| FSH | Premera Blue Cross |
| FSI | Regence BCBS |
| FSJ | Blue Cross Blue Shield of Arizona |
| FSK | Anthem Blue Cross Blue Shield of Ohio |
| FSL | Blue Cross Blue Shield of Illinois |
| FSM | Blue Cross Blue Shield of Georgia |
| FSN | Blue Cross Blue Shield of South Carolina |
| FSO | Blue Cross Blue Shield of Florida |
| FSP | Blue Cross Blue Shield of Michigan |
| FSQ | No Prefix Assigned |
| FSR | Premera Blue Cross |
| FSS | Blue Cross Blue Shield of Alabama |
| FST | Blue Cross Blue Shield of Massachusetts |
| FSU | Blue Cross Blue Shield of Georgia |
| FSV | Wellmark BCBS |
| FSW | Blue Cross Blue Shield of Illinois |
| FSX | Blue Cross Blue Shield of South Carolina |
| FSY | No Prefix Assigned |
| FSZ | No Prefix Assigned |
| FTA | Anthem Blue Cross of California |
| FTB | Anthem Blue Cross Blue Shield of Ohio |
| FTC | Blue Cross Blue Shield of Oklahoma |
| FTD | Blue Cross Blue Shield of Illinois |
| FTE | Carefirst Blue Cross Blue Shield of Maryland |
| FTF | Blue Cross Blue Shield of Georgia |
| FTG | No Prefix Assigned |
| FTH | Wellmark BCBS |
| FTI | No Prefix Assigned |
| FTJ | Anthem Blue Cross Blue Shield of Virginia |
| FTK | Anthem Blue Cross Blue Shield of Georgia |
| FTL | Anthem Blue Cross Blue Shield of Georgia |
| FTM | Blue Cross Blue Shield of Georgia |
| FTN | Anthem Blue Cross Blue Shield of Ohio |
| FTO | Capital Blue Cross |
| FTP | Empire Blue Cross Blue Shield of New York |
| FTQ | Anthem Blue Cross Blue Shield of Ohio |
| FTR | Blue Cross Blue Shield of South Carolina |
| FTS | Anthem Blue Cross Blue Shield of Ohio |
| FTT | Blue Shield of California |
| FTU | Anthem Blue Cross of California |
| FTV | Blue Cross of Idaho |
| FTW | Blue Shield of California |
| FTX | Blue Cross Blue Shield of Massachusetts |
| FTY | Blue Cross Blue Shield of Illinois |
| FTZ | Anthem Blue Cross Blue Shield of Virginia |
| FUA | Carefirst Blue Cross Blue Shield of Maryland |
| FUB | Anthem Blue Cross Blue Shield of Ohio |
| FUC | No Prefix Assigned |
| FUD | Blue Cross Blue Shield of South Carolina |
| FUE | Anthem Blue Cross Blue Shield of Wisconsin |
| FUF | Blue Cross Blue Shield of South Carolina |
| FUG | Blue Cross Blue Shield of Texas |
| FUH | Highmark BCBS |
| FUI | Anthem Blue Cross Blue Shield of Ohio |
| FUJ | Empire Blue Cross Blue Shield of New York |
| FUK | Carefirst Blue Cross Blue Shield of Maryland |
| FUL | Anthem Blue Cross Blue Shield of Missouri |
| FUM | Wellmark BCBS |
| FUN | Blue Cross Blue Shield of Illinois |
| FUO | Blue Cross Blue Shield of Florida |
| FUP | No Prefix Assigned |
| FUQ | Blue Cross Blue Shield of South Carolina |
| FUR | Anthem Blue Cross of California |
| FUS | Carefirst Administrators |
| FUT | Carefirst Blue Cross Blue Shield of Maryland |
| FUU | No Prefix Assigned |
| FUV | Blue Cross Blue Shield of South Carolina |
| FUW | Anthem Blue Cross of California |
| FUX | No Prefix Assigned |
| FUY | Anthem Blue Cross Blue Shield of Missouri |
| FUZ | No Prefix Assigned |
| FVA | Regence BCBS |
| FVB | Blue Cross Blue Shield of Tennessee |
| FVC | Independence Blue Cross |
| FVD | No Prefix Assigned |
| FVE | Carefirst Blue Cross Blue Shield of Maryland |
| FVF | Wellmark BCBS |
| FVG | Anthem Blue Cross of California |
| FVH | Blue Cross Blue Shield of Illinois |
| FVI | Anthem Blue Cross Blue Shield of Virginia |
| FVJ | No Prefix Assigned |
| FVK | No Prefix Assigned |
| FVL | Blue Cross Blue Shield of Illinois |
| FVM | Anthem Blue Cross of California |
| FVN | Blue Cross Blue Shield of Michigan |
| FVO | No Prefix Assigned |
| FVP | Anthem Blue Cross Blue Shield of Virginia |
| FVQ | No Prefix Assigned |
| FVR | No Prefix Assigned |
| FVS | Blue Shield of California |
| FVT | Blue Cross Blue Shield of Vermont |
| FVU | Blue Cross Blue Shield of Texas |
| FVV | Blue Cross Blue Shield of Michigan |
| FVW | Wellmark BCBS |
| FVX | Blue Cross Blue Shield of Illinois |
| FVY | No Prefix Assigned |
| FVZ | No Prefix Assigned |
| FWA | Blue Cross Blue Shield of Illinois |
| FWB | Blue Cross Blue Shield of Illinois |
| FWC | Blue Cross Blue Shield of Texas |
| FWD | Blue Cross Blue Shield of Illinois |
| FWE | Carefirst Blue Cross Blue Shield of Maryland |
| FWF | Blue Cross Blue Shield of Illinois |
| FWG | Blue Cross Blue Shield of Illinois |
| FWH | Blue Cross Blue Shield of Minnesota |
| FWI | Carefirst Blue Cross Blue Shield of Maryland |
| FWJ | Anthem Blue Cross Blue Shield of Virginia |
| FWK | No Prefix Assigned |
| FWL | Carefirst Blue Cross Blue Shield of Maryland |
| FWM | Blue Cross Blue Shield of Illinois |
| FWN | Blue Cross Blue Shield of Florida |
| FWO | Carefirst Blue Cross Blue Shield of Maryland |
| FWP | No Prefix Assigned |
| FWQ | Horizon Blue Cross Blue Shield of New Jersey |
| FWR | Anthem Blue Cross Blue Shield of Ohio |
| FWS | Wellmark BCBS |
| FWT | Blue Cross Blue Shield of Alabama |
| FWU | No Prefix Assigned |
| FWV | Blue Cross Blue Shield of Minnesota |
| FWW | Blue Cross Blue Shield of Massachusetts |
| FWX | Wellmark BCBS |
| FWY | Blue Cross Blue Shield of Illinois |
| FWZ | Anthem Blue Cross Blue Shield of Virginia |
| FXA | No Prefix Assigned |
| FXB | Anthem Blue Cross of California |
| FXC | Blue Cross Blue Shield of Massachusetts |
| FXD | Anthem Blue Cross of California |
| FXE | Anthem Blue Cross Blue Shield of Ohio |
| FXF | Anthem Blue Cross of California |
| FXG | Anthem Blue Cross of California |
| FXH | Blue Cross Blue Shield of Tennessee |
| FXI | Anthem Blue Cross of California |
| FXJ | Wellmark BCBS |
| FXK | Anthem Blue Cross of California |
| FXL | Anthem Blue Cross of California |
| FXM | Anthem Blue Cross of California |
| FXN | Carefirst Blue Cross Blue Shield of Maryland |
| FXO | Carefirst Administrators |
| FXP | Highmark BCBS |
| FXQ | Wellmark BCBS |
| FXR | Blue Cross Blue Shield of Illinois |
| FXS | Blue Cross Blue Shield of Texas |
| FXT | No Prefix Assigned |
| FXU | Blue Cross Blue Shield of Minnesota |
| FXV | Carefirst Blue Cross Blue Shield of Maryland |
| FXW | Anthem Blue Cross Blue Shield of Virginia |
| FXX | Carefirst Blue Cross Blue Shield of Maryland |
| FXY | Blue Cross Blue Shield of Tennessee |
| FXZ | Anthem Blue Cross of California |
| FYA | Blue Cross Blue Shield of Massachusetts |
| FYB | Highmark BCBS |
| FYC | Blue Shield of Northeastern New York |
| FYD | Anthem Blue Cross Blue Shield of Ohio |
| FYE | Highmark BCBS |
| FYF | Blue Cross Blue Shield of Minnesota |
| FYG | Anthem Blue Cross Blue Shield of Virginia |
| FYH | Blue Cross Blue Shield of Western New York |
| FYI | No Prefix Assigned |
| FYJ | Anthem Blue Cross Blue Shield of Virginia |
| FYK | Anthem Blue Cross Blue Shield of Ohio |
| FYL | Carefirst Administrators |
| FYM | Highmark BCBS |
| FYN | Blue Cross Blue Shield of Florida |
| FYO | Highmark BCBS |
| FYP | Independence Blue Cross |
| FYQ | Blue Cross Blue Shield of Michigan |
| FYR | Blue Cross Blue Shield of Massachusetts |
| FYS | Wellmark BCBS |
| FYT | Blue Cross Blue Shield of Illinois |
| FYU | Blue Cross Blue Shield of Massachusetts |
| FYV | Blue Shield of California |
| FYW | Blue Cross Blue Shield of Minnesota |
| FYX | No Prefix Assigned |
| FYY | Blue Cross of Idaho |
| FYZ | Blue Cross Blue Shield of Florida |
| FZA | Blue Cross Blue Shield of South Carolina |
| FZB | Blue Cross of Idaho |
| FZC | Empire Blue Cross Blue Shield of New York |
| FZD | Blue Cross Blue Shield of Michigan |
| FZE | Anthem Blue Cross of California |
| FZF | Blue Cross of Idaho |
| FZG | Blue Cross Blue Shield of Nebraska |
| FZH | Carefirst Blue Cross Blue Shield of Maryland |
| FZI | No Prefix Assigned |
| FZJ | Empire Blue Cross Blue Shield of New York |
| FZK | Carefirst Administrators |
| FZL | No Prefix Assigned |
| FZM | Blue Cross Blue Shield of Tennessee |
| FZN | Carefirst Blue Cross Blue Shield of Maryland |
| FZO | Highmark BCBS |
| FZP | Blue Cross Blue Shield of Michigan |
| FZQ | Capital Blue Cross |
| FZR | Anthem Blue Cross Blue Shield of Nevada |
| FZS | No Prefix Assigned |
| FZT | Blue Cross Blue Shield of Illinois |
| FZU | Blue Cross Blue Shield of Florida |
| FZV | Wellmark BCBS |
| FZW | Premera Blue Cross |
| FZX | Anthem Blue Cross Blue Shield of Virginia |
| FZY | Blue Cross Blue Shield of North Carolina |
| FZZ | Wellmark BCBS |
| F2B | Blue Cross Blue Shield of Texas |
| F2F | Horizon Blue Cross Blue Shield of New Jersey |
| F2G | Regence Blue Cross Blue Shield of Oregon |
| F2K | Premera Blue Cross |
| F2L | Blue Cross Blue Shield of Illinois |
| F2M | Blue Cross of Idaho |
| F2N | Blue Cross Blue Shield of Illinois |
| F2P | Anthem Blue Cross of California |
| F2S | Blue Cross Blue Shield of Rhode Island |
| F2T | Anthem BCBS of Ohio |
| F2W | Blue Cross Blue Shield of Illinois |
| F3B | Premera Blue Cross |
| F3C | Highmark BCBS of Pennsylvania |
| F3E | BCBS of Texas |
| F3F | BCBS of Illinois |
| F3M | BCBS of Illinois |
| F3P | Highmark BCBS of Pennsylvania |
| F4A | Anthem BCBS of Virginia |
| F4C | BCBS of Texas |
| F4F | BCBS of Texas |
| F4G | BCBS of Minnesota |
| F4S | Horizon BCBS of New Jersey |
| F4W | Florida Blue |
| F5A | BCBS of Minnesota |
| F5Z | Horizon BCBS of New Jersey |
| F6A | Anthem BCBS of Indiana |
| F6G | BCBS of Illinois |
| F7F | BCBS of Texas |
| F7G | BCBS of Illinois |
| F9S | Anthem BCBS of Ohio |
| F9T | Horizon BCBS of New Jersey |
