| KAA KAC KAN KAS KBK KBN KBQ KCR KDD KDE KDS KDY KDZ KEG KEJ KEL KEN KEY KFE KFF KFG KFI KFN KFS KFT KFW KFX KFZ KGH KHK KHQ KHR KHU KHW KIC KIE KII KIJ KIL KIP KIQ KIV KIW KJA KJE KJK KJL KJM KJR KJT KJY KJZ KKG KKK KKQ KKY KKZ KLA KLC KLJ KLU KMC KMI KML KNF KNH KNM KOD KOE KOG KOH KOK KOS KPB KPL KPN KPQ KPR KPV KQE KQV KQX KQY KQZ KRF KRG KRK KRL KRM KRQ KRS KRT KRV KRY KSF KSH KSI KSU KSV KSY KTM KUA KUD KUH KUN KUQ KUX KUY KUZ KVE KVH KVJ KVM KVN KVP KVR KVU KVV KWC KWJ KWL KWS KXB KXH KXN KXZ KYB KYM KYN KYP KYQ KYV KZA KZJ KZM KZT KZW | Alpha Prefix not assigned or unallocated |
| KBB | Anthem Blue Cross Blue Shield of Colorado |
| KEZ | Anthem Blue Cross Blue Shield of Connecticut |
| KAG KAV KAW KBV KCC KDV KFM KFR KHI KHV KIA KKB KKD KKF KKM KLI KNK KNL KOV KOW KPE KSX KTT KTW KTX KZZ | Anthem Blue Cross Blue Shield of Georgia |
| KAH KEF KFV KIB KWM | Anthem Blue Cross Blue Shield of Indiana |
| KBX KKT KKV KPS KTD KYL KYT | Anthem Blue Cross Blue Shield of Kentucky |
| KMV KMX | Anthem Blue Cross Blue Shield of Maine |
| KBA KJI KJN KJQ KJU KNI KRN KXQ | Anthem Blue Cross Blue Shield of Missouri |
| KGL KUV | Anthem Blue Cross Blue Shield of Nevada |
| KFJ KFU | Anthem Blue Cross Blue Shield of New Hampshire |
| KCE KCK KCY KDH KFQ KGG KGK KGR KGT KGV KGZ KHP KJO KLB KLE KMZ KNA KNC KND KNU KOL KOQ KPA KPG KQB KRE KRO KRU KRW KSG KTS KUJ KUU KVZ KXT KYC KYG KYH KYJ KYU KYW KZB KZI | Anthem Blue Cross Blue Shield of Ohio |
| KBC KGX KLK KLR KPD KPP KTR KXU KZP | Anthem Blue Cross Blue Shield of Virginia |
| KBE KBL KBS KBW KDN KES KHE KHJ KHL KHN KHX KHY KMB KNO KOP KPW KPX KPZ KQP KQR KRX KTG KVW KXL KZL | Anthem Blue Cross Blue Shield of Wisconsin |
| KAX KBZ KCF KEB KEK KFO KGD KGF KGW KIZ KKI KKW KLQ KLW KLY KNQ KNR KPC KRA KRZ KTA KVK KVY KWD KWI KWN KWT KWU KXI KXJ KYR KZD KZU | Anthem Bluecross of California |
| KUM | Arkansas Blue Cross Blue Shield |
| KAL KFK KHB KHH KID KIF KIU KJD KKA KQG KVB KVD KYI KYX KZC | Blue Cross Blue Shield of Alabama |
| KAI KGM KST KTO | Blue Cross Blue Shield of Arizona |
| KAE KAT KAU KAZ KCG KED KEP KEX KFC KGU KHA KIK KIT KJF KJG KJH KJW KKH KKP KLT KMK KNE KNS KOM KON KPJ KRP KRR KTH KTJ KTU KTV KUC KUL KUR KUW KVA KWE KWR KXC KXE KXW KYF KZH KZX | Blue Cross Blue Shield of Illinois |
| KGS KSA KSE | Blue Cross Blue Shield of Kansas |
| KAR KDC KDL KDW KMS KPM KSJ KVL KWF | Blue Cross Blue Shield of Kansas City |
| KAJ | Blue Cross Blue Shield of Louisiana |
| KDG KDM KDT KOC KQF KSL KSM KSO KVX KWP KXG | Blue Cross Blue Shield of Massachusetts |
| KAD KAQ KCO KCU KCW KDA KDB KDO KEI KEW KKC KKO KKR KLG KLM KLN KLP KMT KMU KOJ KOR KOU KOZ KQO KQW KRI KSC KSP KUI KUO KWA KWO KXO KYA KYD KYK KYO KZO KZY | Blue Cross Blue Shield of Michigan |
| KAO KCL KHT KKU KLS KPT KVG KVO KXP KXV | Blue Cross Blue Shield of Minnesota |
| KFH KKX KLH KMP KTK KWZ | Blue Cross Blue Shield of Nebraska |
| KBO KNZ KQJ KUT KZG | Blue Cross Blue Shield of North Carolina |
| KKE | Blue Cross Blue Shield of Oklahoma |
| KQI KUP | Blue Cross Blue Shield of Rhode Island |
| KAF KBD KBM KBU KCP KDF KEM KFL KGB KGJ KHF KHM KJC KJS KMW KUS KWB | Blue Cross Blue Shield of South Carolina |
| KCI KDK KNX KSW KSZ KUB KVI | Blue Cross Blue Shield of Tennessee |
| KCJ KGN KKJ KNP KPK KQN KSK KSQ KSS KTZ KZN | Blue Cross Blue Shield of Texas |
| KDU KTY | Blue Cross Blue Shield of Vermont |
| KAK KFA KIM KIY KJX KLV KNY KOA KOT KQQ KTE KXA KXD KZF KZQ | Blue Cross Blue Shield of Western New York |
| KEE KHO KMQ KOO KOX | Bluecross of Idaho |
| KCX KDI KFD KFP KGO KHG KIX KMA KMO KNJ KOB KPI KPO KQC KTF KTI KTP KUE | Blueshield of California |
| KBY KMG KWY KXF | Blueshield of Northeastern New York |
| KBI KIS KWQ | Capital Bluecross of Pennsylvania |
| KBP KEH KET KEU KGI KGP KGQ KJB KJJ KLD KLF KNV KSR KWW KXY KYZ KZK KZV | Carefirst Blue Cross Blue Shield(Maryland/District of Columbia/Northern Virginia) |
| KBJ KCH KDX KIG KIH KIO KJV KLL KLO KMJ KMY KNN KRB KSN KYS | Empire Blue Cross Blue Shield of New York |
| KAY | Excellus Blue Cross Blue Shield of New York |
| KGA KGC KMF KMH KXK KYY KZS | Florida Blue |
| KCM KCN KDR KEQ KHC KMD KMM KMN KNB KTC KVT | Highmark Blue Cross Blue Shield of Pennsylvania |
| KBH KDJ KDP KDQ KEC KJP KKN KLX KPH KPU KQD KQL KQM KQS KUG KUK KWH KZR | Horizon Blue Cross Blue Shield of New Jersey |
| KAP KBF KEV KGE KNT KOI KOY KPY KSD | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| KBR KCQ KFY KHS KLZ KQK KQU KTN KTQ KVS KXM KXR | Premera Blue Cross Blue Shield of Alaska |
| KBG KCD KCT KER KFB KIN KIR KPF KQT KSB KWV KWX | Regence Blue Cross Blue Shield(Oregon/Idaho/Utah/Washington) |
| KAB KAM KBT KCA KCB KCS KCV KCZ KEA KEO KGY KHD KHZ KKL KKS KME KMR KNG KNW KOF KQA KQH KRC KRD KRH KRJ KTB KTL KUF KVC KVF KVQ KWG KWK KXS KXX KYE KZE | Wellmark Blue Cross Blue Shield of South Dakota/Iowa |