| UAD UAI UAJ UAP UBE UBI UBJ UBK UBN UBQ UBT UBW UBY UCD UCF UCM UCT UCU UCV UCY UCZ UDF UDG UDJ UDK UDU UDZ UEP UEU UEV UEY UFE UFM UFO UGE UGI UGM UHA UHB UHG UIA UIB UIS UIZ UJE UJK UJL UJU UJV UJW UKA UKF UKG UKK UKM UKP UKR UKV UKZ ULG ULX UMP UND UNE UNH UNO UNY UOA UOD UOJ UOK UOL UOR UOS UOV UOW UPE UPK UPL UPN UPR UPU UPV UQC UQF UQG UQH UQI UQJ UQL UQN UQR UQS URB URC URD URF URG URH URM URZ USC USD USF USI USL USZ UTE UTH UTI UTJ UTP UTW UUB UUD UUJ UUM UUN UUQ UUR UUT UUU UUV UUW UUY UVH UVJ UVM UVN UVO UVQ UVR UVX UWB UWI UWJ UWK UWL UWO UWR UWV UWY UWZ UXA UXK UXP UYD UYN UYP UYR UYS UYT UYX UZA UZF UZI UZJ UZL UZU UZX | Alpha Prefix not assigned or unallocated |
| UCL UIT ULA UZT | Anthem Blue-Cross Blue-Shield of Colorado |
| UAK UJA UNX UQK UTX UWS UZQ | Anthem Blue-Cross Blue-Shield of Connecticut |
| UDR UIJ UIK UKI ULR URY UTU UUA UXT UYK UYO UZO | Anthem Blue-Cross Blue-Shield of Georgia |
| UBZ UDE UDT UDY UEI UGO UHU UHV UNJ UVB UYB UYH | Anthem Blue-Cross Blue-Shield of Indiana |
| UBR ULH UQM UYY | Anthem Blue-Cross Blue-Shield of Kentucky |
| UBB UCR UEH UEQ UJB UKS UUH UXQ UXV UXY UXZ | Anthem Blue-Cross Blue-Shield of Missouri |
| UDI UFA UMQ UPW URJ | Anthem Blue-Cross Blue-Shield of Nevada |
| UGR UGS UJN | Anthem Blue-Cross Blue-Shield of New Hampshire |
| UBC UBD UCA UCQ UCX UDO UFF UFI UHD UHI UHK UHQ UHT UJO UKY ULB ULC ULQ ULS ULU UMH UNV UOP UOX UPG UQP UQV USP USQ USV UTA UTG UTT UWE UWH | Anthem Blue-Cross Blue-Shield of Ohio |
| UBA UBM UBU UET UMM UTB UUP UVA UVD UVT UYG | Anthem Blue-Cross Blue-Shield of Virginia |
| UDN UJI UJJ UJM UJY UJZ UNA UNI UPD UQE UWC | Anthem Blue-Cross Blue-Shield of Wisconsin |
| UAS UAT UAV UGB UGJ UGK UGW UIP UKE UKT UMG UMO UNL UNR USA UTM UVY UWD UXC UXF UYF UZC UZP | Anthem Bluecross of California |
| UAH UCN UGT UHP UJF ULP UPI UPY USH UVU UXB | Blue-Cross Blue-Shield of Alabama |
| UHE UHL UNF UTK UYU | Blue-Cross Blue-Shield of Arizona |
| UAL UDH UDL UEJ UEZ UFC UFW UGN UGX UHO UHS UHW UJC UJH UJP ULE ULF ULT ULY UMF UOC UOE UPA UPH UPT URA URK URN URV UST UTD UTL UTN UTV UUF UUX UVP UVS UWN UXJ UXM UXU UYA UYL | Blue-Cross Blue-Shield of Illinois |
| UAB UCH UEA ULN UVF | Blue-Cross Blue-Shield of Kansas City |
| UYQ UZM | Blue-Cross Blue-Shield of Louisiana |
| UCG UEB UEL UEM UEN UEW UHM UKB UKW UMA UMI UYE | Blue-Cross Blue-Shield of Massachusetts |
| UAA UAC UAO UAU UAW UAY UBG UCC UCI UCK UDC UDD UDQ UDX UFB UFG UFH UFJ UFK UFL UFQ UFV UFX UGD UGF UGG UGH UGP UGZ UHC UHJ UIC UIE UII UIL UIN UIO UIR UIW ULJ ULO UMK UML UMN UMS UMT UMU UMV UMW UNC UNP UOF UOM UOO UOY UQQ UQU URO URP URU UUO UUZ UVI UWA UWF UWG UWW UXG UXO UXX UYI UYW UZG UZV UZW UZY | Blue-Cross Blue-Shield of Michigan |
| UBH UGV UHX UMC URX | Blue-Cross Blue-Shield of Minnesota |
| UKX UNB | Blue-Cross Blue-Shield of Nebraska |
| UNG USS UUI | Blue-Cross Blue-Shield of North Carolina |
| UJG UKC UKD UUC | Blue-Cross Blue-Shield of Oklahoma |
| UPM UQY UQZ UWP UWX | Blue-Cross Blue-Shield of Rhode Island |
| UQX URR USK USY UXD | Blue-Cross Blue-Shield of South Carolina |
| UCW UEE UGU UKU ULZ UNK USG USN UTZ UUL UWU UXE | Blue-Cross Blue-Shield of Tennessee |
| UAG UAR UCE UEX UJQ UKL UPP UPX URE USE UTS UTY UVZ UZS UZZ | Blue-Cross Blue-Shield of Texas |
| UFR ULK UPQ UQA UQT | Blue-Cross Blue-Shield of Western New York |
| UGQ UID UKN UMB UOI UTC UYZ | Bluecross of Idaho |
| UNS UNT | Bluecross of Vermont |
| UAE UAF UAQ UBO UBS UEC UEF UOT UPZ URS URT USM UTO UUE UUS UXN UZD | Blueshield of California |
| UHY UHZ UPO | Blueshield of Northeastern New York |
| UAZ UCO UDP UER UHN UIH UIQ UIU UIY ULL ULM ULV UMJ UMY UNM UNQ UPC UVK UWM UYM UZR | Carefirst Blue-Cross Blue-Shield(Maryland/District of Columbia/Northern Virginia) |
| UAX UEG UES UKH UKJ UNU UNZ USJ USU USX UVW UWQ UYC | Empire Blue-Cross Blue-Shield of New York |
| UFU UIG URL USR | Excellus Blue-Cross Blue-Shield of New York |
| UFS UGA UIF UME UNW USO UZN | Florida Blue |
| UAM UDM UFZ UGL UHR UJS UMD UOZ URQ USW UXL UZE | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| UAN UCJ UFD UGC UGY UIX UOG UOQ UQW UWT UXI UXW | Horizon Blue-Cross Blue-Shield of New Jersey |
| UBF UBL UDS UFN UFP UFT UHF UJX ULI UPB URI UTF UTQ UTR UVC UVE UVL | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| UCB UDA UDV UIM UIV UJD ULD UMR UMX UMZ UNN UOH UPJ UXS | Premera Blue-Cross Blue-Shield of Alaska |
| UKQ | Premera Bluecross of Alaska |
| UCS UDW UEO UJR UJT UOU UQO USB UUG UUK UYJ | Regence Blue-Cross Blue-Shield(Oregon/Idaho/Utah/Washington) |
| UBP UBV UBX UCP UDB UED UEK UFY UHH UKO ULW UOB UON UPF UPS UQB UQD URW UVG UVV UXH UXR UYV UZB UZH UZK | Wellmark Blue-Cross Blue-Shield of South Dakota/Iowa |