| EAA EAJ EAR EAW EAX EBB EBE EBF EBM EBP EBS ECF ECI ECQ ECW EDE EDK EDQ EDR EEA EEI EEK EEM EET EEV EFB EFE EFF EFH EFO EFT EFV EFY EGC EGE EGH EGQ EGS EGT EGV EGX EHB EHC EHE EHL EHR EHV EHW EHX EHZ EIC EIE EIG EIJ EIK EIO EIP EJD EJF EJG EJH EJO EJR EJS EKA EKD EKI EKQ EKR EKW ELJ ELL ELR ELS ELU EMC EMX ENH ENI ENJ ENK ENP ENR ENW EOL EON EOO EOQ EOR EOS EOW EOZ EPB EPI EPJ EPP EPR EPS EPU EPW EPX EPZ EQD EQH EQI EQJ EQS ERB ERF ERI ERM ERQ ERZ ESA ESC ESJ ESP ESY ETD ETH ETN ETO ETW ETY EUB EUG EUI EUL EUP EUQ EUT EUX EUZ EVA EVB EVD EVG EVJ EVU EVV EVW EVY EVZ EWD EWE EWI EWK EWL EWN EWV EXB EXG EXO EXR EXV EXW EYC EYG EYM EYS EYT EYW EYX EZH EZI EZL EZP EZX | Alpha Prefix not assigned or unallocated |
| EAI EAU EFM EJB EVQ | Anthem Blue Cross Blue Shield of Colorado |
| EAL EHF ELH EWQ EWU EYD | Anthem Blue Cross Blue Shield of Connecticut |
| EDA EDD EFP EMS EOH EOP ETF ETJ ETP ETZ EUY EVL EWT EXE EYI EYO EZJ EZK | Anthem Blue Cross Blue Shield of Georgia |
| EMI EMZ EQK EZM | Anthem Blue Cross Blue Shield of Indiana |
| ELZ ENO | Anthem Blue Cross Blue Shield of Kentucky |
| EHG | Anthem Blue Cross Blue Shield of Maine |
| ECN EGL EJM ELQ ELW EOG EPC EPL ESM ETI ETV EVM EWP EXF EXM EZE EZR | Anthem Blue Cross Blue Shield of Missouri |
| EHH EHK | Anthem Blue Cross Blue Shield of New Hampshire |
| EAK ECH ECJ ECL ECR ECS ECV EDB EDW EEH EEU EGF EKC EKM EKU EKY ELD ELY EMB EMJ EMU EOA EPA EQT ERN ERY ESE EUC EWA EWB EWG EWM EWW EXC EXH EXI EXK EYH EYU EZV | Anthem Blue Cross Blue Shield of Ohio |
| EAC EFU ENC ETC EXT | Anthem Blue Cross Blue Shield of Virginia |
| EBJ ECG EDF EEW EJA ELF ENY ESN ETK EZC | Anthem Blue Cross Blue Shield of Wisconsin |
| EBA EBV ECD EFA EFW EJJ EJK EJN EJQ EJU EJV EMT ENA EPM EQY ETL EUA EVR EWJ EWZ EXQ EZT | Anthem Bluecross of California |
| EDO ERR EVI EXA EXX | Arkansas Blue Cross Blue Shield |
| EAH EAM EBI ECB EDU EEG EIB EIX EMQ EMR EMV ENU EPT EQB ERG EVF EZY | Blue Cross Blue Shield of Alabama |
| EAZ EJX EJY EWX | Blue Cross Blue Shield of Arizona |
| EAD EBQ EBY ECO EDJ EEC EED EEJ EEZ EFZ EGA EHI EHP EHY EIU ELM ELT EMP ENZ ETA ETG EUH EUK EXS EYR | Blue Cross Blue Shield of Illinois |
| EAB EBG EKL ETQ | Blue Cross Blue Shield of Kansas City |
| EBT EMO EQX EUD EZN EZW | Blue Cross Blue Shield of Louisiana |
| EAF EDZ EFJ EFQ EHJ ELI ENL EPV EQM ERH ERK ESD ESS ETS ETU EVC EVX EXU EXY EYA | Blue Cross Blue Shield of Massachusetts |
| EDP EIW EJE EJI EJW EMW EOJ EOV EPD ESB EUV | Blue Cross Blue Shield of Michigan |
| ECX EEF EFG EJP EKK ELA ELG ELP EQZ ETB EYN | Blue Cross Blue Shield of Minnesota |
| ECE EJL | Blue Cross Blue Shield of Mississippi |
| EHN EQE EUR | Blue Cross Blue Shield of Nebraska |
| EKH | Blue Cross Blue Shield of New Mexico |
| ECK EEL EIL EVE | Blue Cross Blue Shield of North Carolina |
| END EZA | Blue Cross Blue Shield of Oklahoma |
| ERV | Blue Cross Blue Shield of Rhode Island |
| EFS EII EIV EKJ EKP ELO ELV EMK ENN EOT EPH ERJ ERO EUO EVP EVS EWO EYQ EZQ EZU | Blue Cross Blue Shield of South Carolina |
| EBW ECC EJZ EPK EQG ESZ EYZ | Blue Cross Blue Shield of Tennessee |
| EAT EAV EAY EBC ECP ECY ECZ EDX EFL EGM EGR EJC EJT EKE ELB ELE ENF ENT EPN EQU ESG EXN EZG | Blue Cross Blue Shield of Texas |
| EUM EVT | Blue Cross Blue Shield of Vermont |
| EQF EQL EQR ERA EST | Blue Cross Blue Shield of Western New York |
| ECU EDH ENX EOE EPE EYV | Bluecross of Idaho |
| EAS EBZ EDI EEO EER EFD EGP EHM EHS EIS EIY EKT EMF EOC EPF EPG EPO EQC ERX ESF ESU ESV ESW EUN EVO | Blueshield of California |
| EAG EBH EDG EEX ENS EOF EPQ ERP ESI EYY EZF EZO | Capital Bluecross of Pennsylvania |
| EAN EAO EAP EBO ECA ECM ECT EDL EDN EDT EDY EEE EEP EFN EFR EGG EGJ EGK EGW EGY EHA EHD EHQ EHT EHU EIA EID EIF EIH EIN EIT EKO EKV EKZ ELC ELN EMG EML EMM ENM EOB EOI EPY EQA EQQ EQW ERL ERU ESH ESR EUE EUW EWC EWY EYB EZS | Carefirst Blue Cross Blue Shield(Maryland/District of Columbia/Northern Virginia) |
| EBN EEY EQP EQV ETR EWF EXJ EXL | Empire Blue Cross Blue Shield of New York |
| EAQ EDC EDS EDV EEB EES EKF EMA ENB EOY EQN EQO ERD ESL ETX EUS EUU EYJ | Florida Blue |
| EBU EFI EGB EIR EKS EMN EOD EOM ETM ETT | Highmark Blue Cross Blue Shield of Pennsylvania |
| EHO EWS EYL | Horizon Blue Cross Blue Shield of New Jersey |
| EEN EGD EGO EIM EIZ EMH ENE ENV ERS EWR | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| EDM EGN EGZ EIQ EKN EMY EOX ERE ETE EXD EXZ EZD | Premera Blue Cross Blue Shield of Alaska |
| EAE EGU ERC ESO EUF EVN EZB | Regence Blue Cross Blue Shield(Oregon/Idaho/Utah/Washington) |
| EBD EBK EBL EBR EBX EEQ EFC EFK EFX EGI EKB EKG EKX ELK ELX EMD EME ENG ENQ EOK EOU ERT ERW ESK ESQ ESX EUJ EVH EVK EWH EXP EYE EYF EYK EYP EZZ | Wellmark Blue Cross Blue Shield of South Dakota/Iowa |