| XAA | BCBS of Alabama |
| XAB | BCBS of Alabama |
| XAC | BCBS of Alabama |
| XAD | BCBS of Alabama |
| XAE | BCBS of Alabama |
| XAF | BCBS of Alabama |
| XAG | BCBS of Alabama |
| XAH | BCBS of Arizona |
| XAI | BCBS of Alabama |
| XAJ | BCBS of Alabama |
| XAK | BCBS of Alabama |
| XAL | BCBS of Alabama |
| XAM | BCBS of Alabama |
| XAN | Anthem BCBS of Missouri |
| XAO | Blue-Shield of California |
| XAP | BCBS of Alabama |
| XAQ | BCBS of Alabama |
| XAR | BCBS of Alabama |
| XAS | BCBS of Alabama |
| XAT | BCBS of Alabama |
| XAU | Anthem BCBS of Colorado |
| XAV | BCBS of Alabama |
| XAW | Anthem Blue-Cross |
| XAX | BCBS of Alabama |
| XAY | BCBS of Alabama |
| XAZ | BCBS of Alabama |
| XBA | No Prefix Assigned |
| XBB | BCBS of Arizona |
| XBC | BCBS of Arizona |
| XBD | BCBS of Arizona |
| XBE | No Prefix Assigned |
| XBF | BCBS of Arizona |
| XBG | No Prefix Assigned |
| XBH | BCBS of Arizona |
| XBI | No Prefix Assigned |
| XBJ | Empire BCBS of New York |
| XBK | BCBS of Arizona |
| XBL | No Prefix Assigned |
| XBM | BCBS of Arizona |
| XBN | BCBS of Arizona |
| XBO | BCBS of Arizona |
| XBP | BCBS of Arizona |
| XBQ | No Prefix Assigned |
| XBR | BCBS of Arizona |
| XBS | BCBS of Arizona |
| XBT | No Prefix Assigned |
| XBU | BCBS of Arizona |
| XBV | No Prefix Assigned |
| XBW | Anthem BCBS of Wisconsin |
| XBX | BCBS of Arizona |
| XBY | BCBS of Arizona |
| XBZ | No Prefix Assigned |
| XCA | Arkansas BCBS |
| XCB | Arkansas BCBS |
| XCC | Arkansas BCBS |
| XCD | Anthem BCBS of Connecticut |
| XCE | No Prefix Assigned |
| XCF | Arkansas BCBS |
| XCG | Arkansas BCBS |
| XCH | Arkansas BCBS |
| XCI | BCBS of Massachusetts |
| XCJ | Arkansas BCBS |
| XCK | Arkansas BCBS |
| XCL | Arkansas BCBS |
| XCM | Arkansas BCBS |
| XCN | No Prefix Assigned |
| XCO | BCBS of Minnesota |
| XCP | Arkansas BCBS |
| XCQ | Arkansas BCBS |
| XCR | Arkansas BCBS |
| XCS | Arkansas BCBS |
| XCT | Anthem BCBS of Connecticut |
| XCU | Arkansas BCBS |
| XCV | No Prefix Assigned |
| XCW | Arkansas BCBS |
| XCX | Arkansas BCBS |
| XCY | No Prefix Assigned |
| XCZ | No Prefix Assigned |
| XDA | Anthem Blue-Cross |
| XDB | Anthem Blue-Cross |
| XDC | Anthem Blue-Cross |
| XDD | Anthem Blue-Cross |
| XDE | Anthem Blue-Cross |
| XDF | Anthem Blue-Cross |
| XDG | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| XDH | Anthem Blue-Cross |
| XDI | Anthem Blue-Cross |
| XDJ | Anthem Blue-Cross |
| XDK | Anthem Blue-Cross |
| XDL | Anthem Blue-Cross |
| XDM | Anthem Blue-Cross |
| XDN | Anthem Blue-Cross |
| XDO | Anthem Blue-Cross |
| XDP | Anthem Blue-Cross |
| XDQ | Anthem Blue-Cross |
| XDR | Anthem Blue-Cross |
| XDS | Anthem Blue-Cross |
| XDT | Anthem Blue-Cross |
| XDU | Anthem Blue-Cross |
| XDV | Anthem BCBS of Ohio |
| XDW | Anthem Blue-Cross |
| XDX | Anthem Blue-Cross |
| XDY | Anthem BCBS of Kentucky |
| XDZ | Anthem Blue-Cross |
| XEA | Blue-Shield of California |
| XEB | Blue-Shield of California |
| XEC | Blue-Shield of California |
| XED | Blue-Shield of California |
| XEE | Blue-Shield of California |
| XEF | Blue-Shield of California |
| XEG | Blue-Shield of California |
| XEH | Blue-Shield of California |
| XEI | Blue-Shield of California |
| XEJ | Blue-Shield of California |
| XEK | Blue-Shield of California |
| XEL | Blue-Shield of California |
| XEM | Blue-Shield of California |
| XEN | Blue-Shield of California |
| XEO | Blue-Shield of California |
| XEP | Blue-Shield of California |
| XEQ | Blue-Shield of California |
| XER | Blue-Shield of California |
| XES | Blue-Shield of California |
| XET | Blue-Shield of California |
| XEU | Blue-Shield of California |
| XEV | Blue-Shield of California |
| XEW | Blue-Shield of California |
| XEX | Blue-Shield of California |
| XEY | Blue-Shield of California |
| XEZ | Blue-Shield of California |
| XFA | Anthem BCBS of Colorado |
| XFB | Anthem BCBS of Colorado |
| XFC | Anthem BCBS of Colorado |
| XFD | Anthem BCBS of Colorado |
| XFE | Anthem BCBS of Colorado |
| XFF | Anthem BCBS of Colorado |
| XFG | Anthem BCBS of Colorado |
| XFH | Anthem BCBS of Colorado |
| XFI | Anthem BCBS of Colorado |
| XFJ | Anthem BCBS of Colorado |
| XFK | Anthem BCBS of Colorado |
| XFL | Anthem BCBS of Colorado |
| XFM | Anthem BCBS of Colorado |
| XFN | Anthem BCBS of Colorado |
| XFO | Anthem BCBS of Colorado |
| XFP | Anthem BCBS of Colorado |
| XFQ | Anthem BCBS of New Hampshire |
| XFR | Anthem BCBS of Nevada |
| XFS | Anthem BCBS of Colorado |
| XFT | Anthem BCBS of Colorado |
| XFU | Blue-Shield of California |
| XFV | No Prefix Assigned |
| XFW | Anthem BCBS of Colorado |
| XFX | Anthem BCBS of Colorado |
| XFY | Anthem BCBS of Colorado |
| XFZ | Anthem BCBS of Colorado |
| XGA | Anthem BCBS of Georgia |
| XGB | Anthem BCBS of Connecticut |
| XGC | Anthem BCBS of Connecticut |
| XGD | Anthem BCBS of Connecticut |
| XGE | Anthem BCBS of Connecticut |
| XGF | Anthem BCBS of Connecticut |
| XGG | Anthem BCBS of Connecticut |
| XGH | Anthem BCBS of Connecticut |
| XGI | Anthem BCBS of Connecticut |
| XGJ | Anthem BCBS of Connecticut |
| XGK | Anthem BCBS of Connecticut |
| XGL | Anthem BCBS of Connecticut |
| XGM | Anthem BCBS of Connecticut |
| XGN | Anthem BCBS of Connecticut |
| XGO | Anthem BCBS of Connecticut |
| XGP | Anthem BCBS of Connecticut |
| XGQ | Empire BCBS of New York |
| XGR | Anthem BCBS of Connecticut |
| XGS | Anthem BCBS of Connecticut |
| XGT | Anthem BCBS of Connecticut |
| XGU | Anthem BCBS of New Hampshire |
| XGV | Anthem BCBS of Connecticut |
| XGW | Empire BCBS of New York |
| XGX | Empire BCBS of New York |
| XGY | Anthem BCBS of Connecticut |
| XGZ | Anthem BCBS of Connecticut |
| XHA | Highmark BCBS of Delaware |
| XHB | Anthem BCBS of Kentucky |
| XHC | Highmark BCBS of Delaware |
| XHD | Highmark BCBS of Delaware |
| XHE | No Prefix Assigned |
| XHF | Anthem BCBS of Virginia |
| XHG | Highmark BCBS of Delaware |
| XHH | Highmark BCBS of Delaware |
| XHI | BCBS of Rhode Island |
| XHJ | Anthem BCBS of Indiana |
| XHK | BCBS of Arizona |
| XHL | Anthem Blue-Cross |
| XHM | No Prefix Assigned |
| XHN | BCBS of Massachusetts |
| XHO | Blue-Cross of Idaho |
| XHP | Highmark BCBS of Delaware |
| XHQ | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| XHR | Anthem BCBS of Connecticut |
| XHS | BCBS of Illinois |
| XHT | Premera BCBS of Alaska |
| XHU | Blue-Shield of California |
| XHV | Anthem BCBS of New Hampshire |
| XHW | Anthem BCBS of Georgia |
| XHX | Anthem Blue-Cross |
| XHY | Anthem BCBS of Virginia |
| XHZ | Empire BCBS of New York |
| XIA | Carefirst BCBS |
| XIB | Carefirst BCBS |
| XIC | Carefirst BCBS |
| XID | Blue-Cross of Idaho |
| XIE | Carefirst BCBS |
| XIF | Carefirst BCBS |
| XIG | Carefirst BCBS |
| XIH | Carefirst BCBS |
| XII | Carefirst BCBS |
| XIJ | Carefirst BCBS |
| XIK | Carefirst BCBS |
| XIL | Carefirst BCBS |
| XIM | Carefirst BCBS |
| XIN | Carefirst BCBS |
| XIO | Carefirst BCBS |
| XIP | Anthem Blue-Cross |
| XIQ | Carefirst BCBS |
| XIR | Carefirst BCBS |
| XIS | Carefirst BCBS |
| XIT | No Prefix Assigned |
| XIU | No Prefix Assigned |
| XIV | BCBS of Rhode Island |
| XIW | Anthem BCBS of Ohio |
| XIX | Anthem BCBS of Missouri |
| XIY | No Prefix Assigned |
| XIZ | No Prefix Assigned |
| XJA | Florida-Blue |
| XJB | Florida-Blue |
| XJC | No Prefix Assigned |
| XJD | Florida-Blue |
| XJE | Florida-Blue |
| XJF | Florida-Blue |
| XJG | Florida-Blue |
| XJH | Florida-Blue |
| XJI | Florida-Blue |
| XJJ | Florida-Blue |
| XJK | Florida-Blue |
| XJL | Florida-Blue |
| XJM | Florida-Blue |
| XJN | Florida-Blue |
| XJO | Florida-Blue |
| XJP | Florida-Blue |
| XJQ | Florida-Blue |
| XJR | Florida-Blue |
| XJS | Florida-Blue |
| XJT | Florida-Blue |
| XJU | Florida-Blue |
| XJV | Anthem BCBS of Maine |
| XJW | Florida-Blue |
| XJX | Florida-Blue |
| XJY | Florida-Blue |
| XJZ | Florida-Blue |
| XKA | No Prefix Assigned |
| XKB | Blue-Shield of California |
| XKC | BCBS of Illinois |
| XKD | Anthem BCBS of Georgia |
| XKE | Anthem BCBS of Georgia |
| XKF | Anthem BCBS of Georgia |
| XKG | Anthem BCBS of Georgia |
| XKH | Premera BCBS of Alaska |
| XKI | Anthem BCBS of Georgia |
| XKJ | Anthem BCBS of Georgia |
| XKK | Anthem BCBS of Georgia |
| XKL | Anthem BCBS of Georgia |
| XKM | Anthem Blue-Cross |
| XKN | Anthem BCBS of Georgia |
| XKO | Anthem BCBS of Georgia |
| XKP | Anthem BCBS of Georgia |
| XKQ | Anthem Blue-Cross |
| XKR | Anthem BCBS of Georgia |
| XKS | Anthem BCBS of Georgia |
| XKT | Anthem BCBS of Georgia |
| XKU | Anthem BCBS of Georgia |
| XKV | Anthem BCBS of Georgia |
| XKW | Anthem BCBS of Georgia |
| XKX | Anthem BCBS of Georgia |
| XKY | Anthem BCBS of Georgia |
| XKZ | Anthem BCBS of Georgia |
| XLA | BCBS of Hawaii |
| XLB | BCBS of Hawaii |
| XLC | BCBS of Hawaii |
| XLD | BCBS of Hawaii |
| XLE | BCBS of Hawaii |
| XLF | BCBS of Hawaii |
| XLG | BCBS of Hawaii |
| XLH | BCBS of Hawaii |
| XLI | BCBS of Hawaii |
| XLJ | Anthem BCBS of Kentucky |
| XLK | BCBS of Hawaii |
| XLL | BCBS of Hawaii |
| XLM | BCBS of Hawaii |
| XLN | BCBS of Hawaii |
| XLO | Anthem Blue-Cross |
| XLP | BCBS of Hawaii |
| XLQ | BCBS of Hawaii |
| XLR | BCBS of Hawaii |
| XLS | BCBS of Western New York |
| XLT | BCBS of Hawaii |
| XLU | Empire BCBS of New York |
| XLV | Wellmark BCBS |
| XLW | BCBS of Hawaii |
| XLX | BCBS of Hawaii |
| XLY | BCBS of Hawaii |
| XLZ | BCBS of Hawaii |
| XMA | Blue-Cross of Idaho |
| XMB | Blue-Cross of Idaho |
| XMC | Anthem BCBS of Maine |
| XMD | Blue-Cross of Idaho |
| XME | Blue-Cross of Idaho |
| XMF | Blue-Cross of Idaho |
| XMG | Blue-Cross of Idaho |
| XMH | Blue-Cross of Idaho |
| XMI | Blue-Cross of Idaho |
| XMJ | Blue-Cross of Idaho |
| XMK | Blue-Cross of Idaho |
| XML | Blue-Cross of Idaho |
| XMM | Blue-Cross of Idaho |
| XMN | Blue-Cross of Idaho |
| XMO | Blue-Cross of Idaho |
| XMP | Blue-Cross of Idaho |
| XMQ | Blue-Cross of Idaho |
| XMR | Blue-Cross of Idaho |
| XMS | Blue-Cross of Idaho |
| XMT | Blue-Cross of Idaho |
| XMU | Blue-Cross of Idaho |
| XMV | Blue-Cross of Idaho |
| XMW | BCBS of Illinois |
| XMX | Blue-Cross of Idaho |
| XMY | Blue-Cross of Idaho |
| XMZ | Wellmark BCBS |
| XNA | Anthem BCBS of Wisconsin |
| XNB | BCBS of Illinois |
| XNC | BCBS of North Carolina |
| XND | Regence BCBS |
| XNE | Regence BCBS |
| XNF | Regence BCBS |
| XNG | BCBS of Western New York |
| XNH | Regence BCBS |
| XNI | No Prefix Assigned |
| XNJ | Regence BCBS |
| XNK | Blue-Shield of California |
| XNL | Anthem Blue-Cross |
| XNM | Regence BCBS |
| XNN | Regence BCBS |
| XNO | Regence BCBS |
| XNP | Regence BCBS |
| XNQ | BCBS of Western New York |
| XNR | Regence BCBS |
| XNS | Anthem BCBS of New Hampshire |
| XNT | Regence BCBS |
| XNU | Empire BCBS of New York |
| XNV | Regence BCBS |
| XNW | Anthem BCBS of Ohio |
| XNX | Anthem Blue-Cross |
| XNY | No Prefix Assigned |
| XNZ | Empire BCBS of New York |
| XOA | BCBS of Illinois |
| XOB | BCBS of Illinois |
| XOC | BCBS of Illinois |
| XOD | BCBS of Illinois |
| XOE | BCBS of Illinois |
| XOF | BCBS of Illinois |
| XOG | BCBS of Illinois |
| XOH | BCBS of Illinois |
| XOI | No Prefix Assigned |
| XOJ | BCBS of Illinois |
| XOK | BCBS of Illinois |
| XOL | BCBS of Illinois |
| XOM | BCBS of Illinois |
| XON | BCBS of Illinois |
| XOO | BCBS of Illinois |
| XOP | BCBS of Illinois |
| XOQ | BCBS of Illinois |
| XOR | BCBS of Illinois |
| XOS | BCBS of Illinois |
| XOT | BCBS of Illinois |
| XOU | BCBS of Illinois |
| XOV | No Prefix Assigned |
| XOW | BCBS of Illinois |
| XOX | BCBS of Illinois |
| XOY | BCBS of Illinois |
| XOZ | BCBS of Illinois |
| XPA | Anthem BCBS of Indiana |
| XPB | Anthem BCBS of Indiana |
| XPC | Anthem BCBS of Indiana |
| XPD | Anthem BCBS of Indiana |
| XPE | Anthem BCBS of Indiana |
| XPF | Anthem BCBS of Indiana |
| XPG | Anthem BCBS of Indiana |
| XPH | No Prefix Assigned |
| XPI | Blue-Shield of California |
| XPJ | No Prefix Assigned |
| XPK | Anthem BCBS of Indiana |
| XPL | No Prefix Assigned |
| XPM | No Prefix Assigned |
| XPN | Anthem BCBS of Ohio |
| XPO | Blue-Cross of Idaho |
| XPP | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| XPQ | Blue-Cross of Idaho |
| XPR | Anthem BCBS of Indiana |
| XPS | Anthem BCBS of Kentucky |
| XPT | No Prefix Assigned |
| XPU | Anthem BCBS of Indiana |
| XPV | Anthem BCBS of Indiana |
| XPW | Anthem BCBS of Indiana |
| XPX | Anthem BCBS of Indiana |
| XPY | No Prefix Assigned |
| XPZ | Anthem BCBS of Ohio |
| XQA | Wellmark BCBS |
| XQB | Wellmark BCBS |
| XQC | Wellmark BCBS |
| XQD | Wellmark BCBS |
| XQE | Wellmark BCBS |
| XQF | Wellmark BCBS |
| XQG | Wellmark BCBS |
| XQH | Wellmark BCBS |
| XQI | Wellmark BCBS |
| XQJ | Wellmark BCBS |
| XQK | Wellmark BCBS |
| XQL | Wellmark BCBS |
| XQM | Wellmark BCBS |
| XQN | Wellmark BCBS |
| XQO | Wellmark BCBS |
| XQP | Wellmark BCBS |
| XQQ | Wellmark BCBS |
| XQR | Wellmark BCBS |
| XQS | Wellmark BCBS |
| XQT | Wellmark BCBS |
| XQU | Wellmark BCBS |
| XQV | Wellmark BCBS |
| XQW | Wellmark BCBS |
| XQX | Wellmark BCBS |
| XQY | Wellmark BCBS |
| XQZ | Wellmark BCBS |
| XRA | BCBS of Massachusetts |
| XRB | Anthem BCBS of Ohio |
| XRC | Anthem BCBS of Indiana |
| XRD | Blue-Shield of California |
| XRE | Anthem BCBS of Ohio |
| XRF | No Prefix Assigned |
| XRG | Anthem BCBS of Ohio |
| XRH | Anthem BCBS of Georgia |
| XRI | Anthem BCBS of Wisconsin |
| XRJ | Anthem BCBS of Virginia |
| XRK | Anthem BCBS of Virginia |
| XRL | Anthem BCBS of Ohio |
| XRM | Capital Blue-Cross of Pennsylvania |
| XRN | Anthem BCBS of Virginia |
| XRO | Anthem BCBS of Ohio |
| XRP | Anthem Blue-Cross |
| XRQ | Anthem BCBS of Virginia |
| XRR | Anthem Blue-Cross |
| XRS | Anthem BCBS of Georgia |
| XRT | Blue-Shield of California |
| XRU | Anthem BCBS of Colorado |
| XRV | Anthem BCBS of Ohio |
| XRW | Anthem BCBS of Maine |
| XRX | BCBS of Massachusetts |
| XRY | Anthem BCBS of Connecticut |
| XRZ | Carefirst BCBS |
| XSA | BCBS of Kansas |
| XSB | BCBS of Kansas |
| XSC | No Prefix Assigned |
| XSD | BCBS of Kansas |
| XSE | BCBS of Kansas |
| XSF | BCBS of Kansas |
| XSG | No Prefix Assigned |
| XSH | BCBS of Kansas |
| XSI | No Prefix Assigned |
| XSJ | BCBS of Kansas |
| XSK | No Prefix Assigned |
| XSL | BCBS of Kansas |
| XSM | BCBS of Kansas |
| XSN | BCBS of Kansas |
| XSO | Anthem BCBS of Nevada |
| XSP | No Prefix Assigned |
| XSQ | No Prefix Assigned |
| XSR | No Prefix Assigned |
| XSS | No Prefix Assigned |
| XST | BCBS of Kansas |
| XSU | Anthem BCBS of Georgia |
| XSV | BCBS of Kansas |
| XSW | Blue-Shield of California |
| XSX | BCBS of Massachusetts |
| XSY | Anthem BCBS of Virginia |
| XSZ | BCBS of Kansas |
| XTA | Anthem BCBS of Kentucky |
| XTB | Anthem BCBS of Kentucky |
| XTC | Anthem BCBS of Kentucky |
| XTD | Anthem BCBS of Kentucky |
| XTE | Anthem BCBS of Kentucky |
| XTF | Anthem BCBS of Kentucky |
| XTG | Anthem BCBS of Kentucky |
| XTH | Anthem BCBS of Kentucky |
| XTI | Anthem BCBS of Kentucky |
| XTJ | Anthem BCBS of Kentucky |
| XTK | Anthem BCBS of Kentucky |
| XTL | Anthem BCBS of Ohio |
| XTM | Anthem BCBS of Connecticut |
| XTN | Anthem BCBS of Kentucky |
| XTO | Anthem BCBS of Virginia |
| XTP | Anthem BCBS of Virginia |
| XTQ | Anthem BCBS of Georgia |
| XTR | No Prefix Assigned |
| XTS | Anthem Blue-Cross |
| XTT | Anthem BCBS of Colorado |
| XTU | Anthem BCBS of Ohio |
| XTV | Anthem BCBS of Kentucky |
| XTW | BCBS of Illinois |
| XTX | Wellmark BCBS |
| XTY | BCBS of Texas |
| XTZ | Anthem BCBS of Ohio |
| XUA | BCBS of Louisiana |
| XUB | BCBS of Louisiana |
| XUC | BCBS of Louisiana |
| XUD | BCBS of Louisiana |
| XUE | BCBS of Louisiana |
| XUF | BCBS of Louisiana |
| XUG | BCBS of Louisiana |
| XUH | BCBS of Louisiana |
| XUI | BCBS of Louisiana |
| XUJ | BCBS of Louisiana |
| XUK | BCBS of Louisiana |
| XUL | BCBS of Louisiana |
| XUM | BCBS of Louisiana |
| XUN | BCBS of Louisiana |
| XUO | Anthem BCBS of Indiana |
| XUP | BCBS of Louisiana |
| XUQ | BCBS of Louisiana |
| XUR | BCBS of Louisiana |
| XUS | BCBS of Louisiana |
| XUT | BCBS of Louisiana |
| XUU | BCBS of Louisiana |
| XUV | BCBS of Louisiana |
| XUW | BCBS of Louisiana |
| XUX | BCBS of Louisiana |
| XUY | BCBS of Louisiana |
| XUZ | No Prefix Assigned |
| XVA | Anthem BCBS of Maine |
| XVB | Anthem BCBS of Maine |
| XVC | Anthem BCBS of Maine |
| XVD | Premera BCBS of Alaska |
| XVE | Anthem BCBS of Maine |
| XVF | Anthem BCBS of Maine |
| XVG | Anthem BCBS of Maine |
| XVH | Anthem BCBS of Maine |
| XVI | Anthem BCBS of Maine |
| XVJ | Anthem BCBS of Maine |
| XVK | No Prefix Assigned |
| XVL | Anthem BCBS of Maine |
| XVM | Anthem BCBS of Maine |
| XVN | No Prefix Assigned |
| XVO | No Prefix Assigned |
| XVP | Anthem BCBS of Maine |
| XVQ | Horizon BCBS of New Jersey |
| XVR | Anthem BCBS of Maine |
| XVS | BCBS of Illinois |
| XVT | Regence BCBS |
| XVU | BCBS of Illinois |
| XVV | Anthem BCBS of Connecticut |
| XVW | Anthem BCBS of Maine |
| XVX | No Prefix Assigned |
| XVY | Anthem BCBS of Georgia |
| XVZ | No Prefix Assigned |
| XWA | No Prefix Assigned |
| XWB | No Prefix Assigned |
| XWC | Carefirst BCBS |
| XWD | Anthem BCBS of Colorado |
| XWE | Anthem BCBS of Missouri |
| XWF | Anthem BCBS of Missouri |
| XWG | Empire BCBS of New York |
| XWH | Anthem BCBS of Wisconsin |
| XWI | Wellmark BCBS |
| XWJ | Anthem BCBS of Connecticut |
| XWK | BCBS of Rhode Island |
| XWL | Anthem BCBS of Ohio |
| XWM | BCBS of Rhode Island |
| XWN | Anthem BCBS of Connecticut |
| XWO | Carefirst BCBS |
| XWP | Anthem BCBS of Wisconsin |
| XWQ | Anthem BCBS of Indiana |
| XWR | Carefirst BCBS |
| XWS | Wellmark BCBS |
| XWT | Premera BCBS of Alaska |
| XWU | Anthem BCBS of Colorado |
| XWV | Carefirst BCBS |
| XWW | No Prefix Assigned |
| XWX | Anthem BCBS of Colorado |
| XWY | Carefirst BCBS |
| XWZ | Carefirst BCBS |
| XXA | BCBS of Massachusetts |
| XXB | BCBS of Massachusetts |
| XXC | BCBS of Massachusetts |
| XXD | BCBS of Massachusetts |
| XXE | BCBS of Massachusetts |
| XXF | BCBS of Massachusetts |
| XXG | BCBS of Massachusetts |
| XXH | BCBS of Massachusetts |
| XXI | BCBS of Massachusetts |
| XXJ | Anthem Blue-Cross |
| XXK | BCBS of Massachusetts |
| XXL | No Prefix Assigned |
| XXM Blue Cross Prefix | BCBS of Massachusetts |
| XXN | BCBS of Massachusetts |
| XXO | Anthem BCBS of Indiana |
| XXP | BCBS of Massachusetts |
| XXQ | BCBS of Massachusetts |
| XXR | BCBS of Massachusetts |
| XXS | BCBS of Massachusetts |
| XXT | BCBS of Massachusetts |
| XXU | BCBS of Massachusetts |
| XXV | BCBS of Massachusetts |
| XXW | BCBS of Massachusetts |
| XXX | No Prefix Assigned |
| XXY | BCBS of Massachusetts |
| XXZ | BCBS of Massachusetts |
| XYA | Anthem BCBS of Virginia |
| XYB | BCBS of Michigan |
| XYC | BCBS of Oklahoma |
| XYD | BCBS of Michigan |
| XYE | BCBS of Michigan |
| XYF | BCBS of Michigan |
| XYG | BCBS of Michigan |
| XYH | BCBS of Michigan |
| XYI | No Prefix Assigned |
| XYJ | BCBS of Michigan |
| XYK | BCBS of Michigan |
| XYL | BCBS of Michigan |
| XYM | Regence BCBS |
| XYN | Anthem BCBS of Connecticut |
| XYO | Anthem Blue-Cross |
| XYP | BCBS of Michigan |
| XYQ | BCBS of Michigan |
| XYR | BCBS of Michigan |
| XYS | BCBS of Michigan |
| XYT | BCBS of Illinois |
| XYU | BCBS of Michigan |
| XYV | BCBS of Michigan |
| XYW | BCBS of Michigan |
| XYX | BCBS of Michigan |
| XYY | BCBS of Michigan |
| XYZ | Anthem BCBS of Connecticut |
| XZA | BCBS of Minnesota |
| XZB | No Prefix Assigned |
| XZC | BCBS of Minnesota |
| XZD | BCBS of Minnesota |
| XZE | BCBS of Minnesota |
| XZF | No Prefix Assigned |
| XZG | No Prefix Assigned |
| XZH | BCBS of Minnesota |
| XZI | No Prefix Assigned |
| XZJ | No Prefix Assigned |
| XZK | No Prefix Assigned |
| XZL | BCBS of Minnesota |
| XZM | No Prefix Assigned |
| XZN | No Prefix Assigned |
| XZO | No Prefix Assigned |
| XZP | No Prefix Assigned |
| XZQ | BCBS of Minnesota |
| XZR | BCBS of Minnesota |
| XZS | No Prefix Assigned |
| XZT | No Prefix Assigned |
| XZU | BCBS of Minnesota |
| XZV | No Prefix Assigned |
| XZW | No Prefix Assigned |
| XZX | BCBS of Minnesota |
| XZY | No Prefix Assigned |
| XZZ | No Prefix Assigned |
| X2A | Anthem BCBS of Connecticut |
| X2B | Blue Cross of Idaho |
| X2C | Anthem BCBS of Connecticut |
| X2D | Anthem BCBS of Connecticut |
| X2E | Anthem BCBS of Connecticut |
| X2H | Wellmark BCBS |
| X2P | Anthem BCBS of Virginia |
| X3A | Anthem BCBS of New Hampshire |
| X3H | Wellmark BCBS |
| X9A | Blue Cross of California |
