| LAA | BCBS of Illinois | Illinois |
| LAB | BCBS of Michigan | Michigan |
| LAC | Anthem BCBS of Kentucky | Kentucky |
| LAD | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LAE | No Prefix Assigned | N/A |
| LAF | Anthem BCBS of Virginia | Virginia |
| LAG | BCBS of North Carolina | North Carolina |
| LAH | No Prefix Assigned | N/A |
| LAI | No Prefix Assigned | N/A |
| LAJ | BCBS of New Mexico | New Mexico |
| LAK | BCBS of Illinois | Illinois |
| LAL | BCBS of Alabama | Alabama |
| LAM | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LAN | Anthem BCBS of Ohio | Ohio |
| LAO | Highmark BCBS of Pennsylvania | Pennsylvania |
| LAP | Blue Shield of California | California |
| LAQ | No Prefix Assigned | N/A |
| LAR | BCBS of Illinois | Illinois |
| LAS | BCBS of South Carolina | South Carolina |
| LAT | Blue Shield of California | California |
| LAU | BCBS of Kansas City | Kansas City |
| LAV | Anthem Blue-Cross | California |
| LAW | BCBS of South Carolina | South Carolina |
| LAX | No Prefix Assigned | N/A |
| LAY | Arkansas BCBS | Arkansas |
| LAZ | Blue Shield of California | California |
| LBA | No Prefix Assigned | N/A |
| LBB | Anthem BCBS of Ohio | Ohio |
| LBC | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LBD | Anthem BCBS of Ohio | Ohio |
| LBE | BCBS of Tennessee | Tennessee |
| LBF | BCBS of Tennessee | Tennessee |
| LBG | BCBS of South Carolina | South Carolina |
| LBH | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LBI | Anthem BCBS of Ohio | Ohio |
| LBJ | No Prefix Assigned | N/A |
| LBK | No Prefix Assigned | N/A |
| LBL | BCBS of Massachusetts | Massachusetts |
| LBM | Highmark BCBS of Pennsylvania | Pennsylvania |
| LBN | Anthem BCBS of Wisconsin | Wisconsin |
| LBO | Premera BCBS of Alaska | Alaska |
| LBP | BCBS of Oklahoma | Oklahoma |
| LBQ | Wellmark BCBS | Iowa, South DakotaIowa |
| LBR | Premera BCBS of Alaska | Alaska |
| LBS | BCBS of Massachusetts | Massachusetts |
| LBT | Empire BCBS of New York | New York |
| LBU | Anthem BCBS of Virginia | Virginia |
| LBV | No Prefix Assigned | N/A |
| LBW | BCBS of South Carolina | South Carolina |
| LBX | BCBS of Texas | Texas |
| LBY | No Prefix Assigned | N/A |
| LBZ | No Prefix Assigned | N/A |
| LCA | Wellmark BCBS | Iowa, South DakotaIowa |
| LCB | BCBS of Illinois | Illinois |
| LCC | Anthem BCBS of Georgia | Georgia |
| LCD | Anthem BCBS of Missouri | Missouri |
| LCE | BCBS of South Carolina | South Carolina |
| LCF | Anthem BCBS of Virginia | Virginia |
| LCG | BCBS of North Carolina | North Carolina |
| LCH | BCBS of Illinois | Illinois |
| LCI | BCBS of North Carolina | North Carolina |
| LCJ | Florida-Blue | Florida |
| LCK | Florida-Blue | Florida |
| LCL | Empire BCBS of New York | New York |
| LCM | Anthem BCBS of Wisconsin | Wisconsin |
| LCN | BCBS of Tennessee | Tennessee |
| LCO | BCBS of Alabama | Alabama |
| LCP | BCBS of Nebraska | Nebraska |
| LCQ | BCBS of Tennessee | Tennessee |
| LCR | Anthem Blue-Cross | California |
| LCS | Highmark BCBS of Pennsylvania | Pennsylvania |
| LCT | BCBS of Oklahoma | Oklahoma |
| LCU | No Prefix Assigned | N/A |
| LCV | Florida-Blue | Florida |
| LCW | Wellmark BCBS | Iowa, South DakotaIowa |
| LCX | BCBS of Rhode Island | Rhode Island |
| LCY | BCBS of North Carolina | North Carolina |
| LCZ | Anthem BCBS of Ohio | Ohio |
| LDA | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LDB | Anthem Blue-Cross | California |
| LDC | BCBS of Illinois | Illinois |
| LDD | BCBS of South Carolina | South Carolina |
| LDE | BCBS of Texas | Texas |
| LDF | BCBS of South Carolina | South Carolina |
| LDG | Anthem Blue-Cross | California |
| LDH | Wellmark BCBS | Iowa, South DakotaIowa |
| LDI | BCBS of Minnesota | Minnesota |
| LDJ | Anthem BCBS of Virginia | Virginia |
| LDK | BCBS of Western New York | New York (Western) |
| LDL | Anthem BCBS of Ohio | Ohio |
| LDM | BCBS of Michigan | Michigan |
| LDN | Highmark BCBS of Pennsylvania | Pennsylvania |
| LDO | Anthem BCBS of Georgia | Georgia |
| LDP | Arkansas BCBS | Arkansas |
| LDQ | Anthem BCBS of Kentucky | Kentucky |
| LDR | Anthem BCBS of Georgia | Georgia |
| LDS | Wellmark BCBS | Iowa, South DakotaIowa |
| LDT | Empire BCBS of New York | New York |
| LDU | Anthem Blue-Cross | California |
| LDV | BCBS of Massachusetts | Massachusetts |
| LDW | No Prefix Assigned | N/A |
| LDX | No Prefix Assigned | N/A |
| LDY | Horizon BCBS of New Jersey | New Jersey |
| LDZ | Anthem BCBS of Ohio | Ohio |
| LEA | Anthem BCBS of Kentucky | Kentucky |
| LEB | Anthem Blue-Cross | California |
| LEC | BCBS of Michigan | Michigan |
| LED | BCBS of Illinois | Illinois |
| LEE | Premera BCBS of Alaska | Alaska |
| LEF | No Prefix Assigned | N/A |
| LEG | BCBS of Illinois | Illinois |
| LEH | No Prefix Assigned | N/A |
| LEI | No Prefix Assigned | N/A |
| LEJ | Anthem BCBS of Wisconsin | Wisconsin |
| LEK | No Prefix Assigned | N/A |
| LEL | BCBS of Illinois | Illinois |
| LEM | Anthem BCBS of Wisconsin | Wisconsin |
| LEN | Blue Shield of Northeastern New York | New York (Northeastern) |
| LEO | BCBS of Michigan | Michigan |
| LEP | BCBS of Texas | Texas |
| LEQ | BCBS of South Carolina | South Carolina |
| LER | BCBS of Massachusetts | Massachusetts |
| LES | Horizon BCBS of New Jersey | New Jersey |
| LET | BCBS of Western New York | New York (Western) |
| LEU | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LEV | BCBS of Louisiana | Louisiana |
| LEW | Anthem Blue-Cross | California |
| LEX | Anthem BCBS of Georgia | Georgia |
| LEY | BCBS of North Carolina | North Carolina |
| LEZ | BCBS of Arizona | Arizona |
| LFA | Arkansas BCBS | Arkansas |
| LFB | BCBS of Illinois | Illinois |
| LFC | BCBS of Minnesota | Minnesota |
| LFD | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LFE | BCBS of Minnesota | Minnesota |
| LFF | Wellmark BCBS | Iowa, South DakotaIowa |
| LFG | BCBS of Tennessee | Tennessee |
| LFH | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LFI | BCBS of Michigan | Michigan |
| LFJ | No Prefix Assigned | N/A |
| LFK | BCBS of Texas | Texas |
| LFL | No Prefix Assigned | N/A |
| LFM | BCBS of Illinois | Illinois |
| LFN | No Prefix Assigned | N/A |
| LFO | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LFP | BCBS of Louisiana | Louisiana |
| LFQ | No Prefix Assigned | N/A |
| LFR | BCBS of North Carolina | North Carolina |
| LFS | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LFT | No Prefix Assigned | N/A |
| LFU | No Prefix Assigned | N/A |
| LFV | BCBS of Texas | Texas |
| LFW | No Prefix Assigned | N/A |
| LFX | BCBS of Kansas City | Kansas City |
| LFY | Anthem Blue-Cross | California |
| LFZ | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LGA | Anthem BCBS of Ohio | Ohio |
| LGB | BCBS of Alabama | Alabama |
| LGC | Anthem BCBS of Kentucky | Kentucky |
| LGD | Anthem BCBS of Missouri | Missouri |
| LGE | Anthem BCBS of Kentucky | Kentucky |
| LGF | No Prefix Assigned | N/A |
| LGG | No Prefix Assigned | N/A |
| LGH | Anthem BCBS of Kentucky | Kentucky |
| LGI | BCBS of Massachusetts | Massachusetts |
| LGJ | Anthem BCBS of Missouri | Missouri |
| LGK | BCBS of South Carolina | South Carolina |
| LGL | Highmark BCBS of Pennsylvania | Pennsylvania |
| LGM | Arkansas BCBS | Arkansas |
| LGN | Florida-Blue | Florida |
| LGO | Anthem BCBS of Georgia | Georgia |
| LGP | BCBS of Illinois | Illinois |
| LGQ | BCBS of North Carolina | North Carolina |
| LGR | Anthem BCBS of Missouri | Missouri |
| LGS | BCBS of Alabama | Alabama |
| LGT | BCBS of Illinois | Illinois |
| LGU | Anthem BCBS of Missouri | Missouri |
| LGV | No Prefix Assigned | N/A |
| LGW | Anthem BCBS of Missouri | Missouri |
| LGX | No Prefix Assigned | N/A |
| LGY | BCBS of Texas | Texas |
| LGZ | Anthem BCBS of Missouri | Missouri |
| LHA | No Prefix Assigned | N/A |
| LHB | Anthem BCBS of Virginia | Virginia |
| LHC | Anthem BCBS of Virginia | Virginia |
| LHD | Wellmark BCBS | Iowa, South DakotaIowa |
| LHE | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LHF | Anthem BCBS of Virginia | Virginia |
| LHG | No Prefix Assigned | N/A |
| LHH | BCBS of South Carolina | South Carolina |
| LHI | BCBS of Massachusetts | Massachusetts |
| LHJ | Highmark BCBS of Pennsylvania | Pennsylvania |
| LHK | No Prefix Assigned | N/A |
| LHL | No Prefix Assigned | N/A |
| LHM | Empire BCBS of New York | New York |
| LHN | BCBS of Kansas City | Kansas City |
| LHO | Anthem BCBS of Kentucky | Kentucky |
| LHP | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LHQ | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LHR | Anthem BCBS of Ohio | Ohio |
| LHS | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LHT | No Prefix Assigned | N/A |
| LHU | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LHV | Anthem Blue-Cross | California |
| LHW | Empire BCBS of New York | New York |
| LHX | BCBS of Texas | Texas |
| LHY | No Prefix Assigned | N/A |
| LHZ | Anthem BCBS of Wisconsin | Wisconsin |
| LIA | BCBS of Massachusetts | Massachusetts |
| LIB | Anthem BCBS of Virginia | Virginia |
| LIC | No Prefix Assigned | N/A |
| LID | No Prefix Assigned | N/A |
| LIE | BCBS of Michigan | Michigan |
| LIF | Wellmark BCBS | Iowa, South DakotaIowa |
| LIG | Blue-Cross of Idaho | Idaho |
| LIH | No Prefix Assigned | N/A |
| LII | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LIJ | No Prefix Assigned | N/A |
| LIK | No Prefix Assigned | N/A |
| LIL | Wellmark BCBS | Iowa, South DakotaIowa |
| LIM | BCBS of Nebraska | Nebraska |
| LIN | BCBS of Nebraska | Nebraska |
| LIO | Blue Shield of California | California |
| LIP | No Prefix Assigned | N/A |
| LIQ | No Prefix Assigned | N/A |
| LIR | No Prefix Assigned | N/A |
| LIS | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LIT | Premera BCBS of Alaska | Alaska |
| LIU | BCBS of Rhode Island | Rhode Island |
| LIV | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LIW | No Prefix Assigned | N/A |
| LIX | Blue Shield of California | California |
| LIY | No Prefix Assigned | N/A |
| LIZ | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LJA | Anthem BCBS of Georgia | Georgia |
| LJB | No Prefix Assigned | N/A |
| LJC | BCBS of Illinois | Illinois |
| LJD | No Prefix Assigned | N/A |
| LJE | BCBS of Illinois | Illinois |
| LJF | No Prefix Assigned | N/A |
| LJG | Excellus BCBS of New York | New York |
| LJH | Wellmark BCBS | Iowa, South DakotaIowa |
| LJI | Blue Shield of Northeastern New York | New York (Northeastern) |
| LJJ | Blue Shield of California | California |
| LJK | BCBS of South Carolina | South Carolina |
| LJL | No Prefix Assigned | N/A |
| LJM | Highmark BCBS of Pennsylvania | Pennsylvania |
| LJN | No Prefix Assigned | N/A |
| LJO | BCBS of Michigan | Michigan |
| LJP | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LJQ | No Prefix Assigned | N/A |
| LJR | Anthem BCBS of Wisconsin | Wisconsin |
| LJS | BCBS of Illinois | Illinois |
| LJT | No Prefix Assigned | N/A |
| LJU | No Prefix Assigned | N/A |
| LJV | BCBS of Minnesota | Minnesota |
| LJW | No Prefix Assigned | N/A |
| LJX | BCBS of Illinois | Illinois |
| LJY | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LJZ | No Prefix Assigned | N/A |
| LKA | BCBS of Massachusetts | Massachusetts |
| LKB | BCBS of Massachusetts | Massachusetts |
| LKC | BCBS of Western New York | New York (Western) |
| LKD | BCBS of Tennessee | Tennessee |
| LKE | BCBS of Tennessee | Tennessee |
| LKF | Horizon BCBS of New Jersey | New Jersey |
| LKG | Premera BCBS of Alaska | Alaska |
| LKH | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LKI | Blue Shield of California | California |
| LKJ | BCBS of Minnesota | Minnesota |
| LKK | Blue Shield of Northeastern New York | New York (Northeastern) |
| LKL | Anthem BCBS of Kentucky | Kentucky |
| LKM | BCBS of Minnesota | Minnesota |
| LKN | Anthem BCBS of Ohio | Ohio |
| LKO | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LKP | Florida-Blue | Florida |
| LKQ | BCBS of Illinois | Illinois |
| LKR | BCBS of Massachusetts | Massachusetts |
| LKS | Anthem Blue-Cross | California |
| LKT | BCBS of Western New York | New York (Western) |
| LKU | Wellmark BCBS | Iowa, South DakotaIowa |
| LKV | BCBS of Nebraska | Nebraska |
| LKW | BCBS of Tennessee | Tennessee |
| LKX | Empire BCBS of New York | New York |
| LKY | Anthem BCBS of Virginia | Virginia |
| LKZ | BCBS of North Carolina | North Carolina |
| LLA | No Prefix Assigned | N/A |
| LLB | BCBS of Illinois | Illinois |
| LLC | BCBS of Louisiana | Louisiana |
| LLD | Blue Shield of California | California |
| LLE | No Prefix Assigned | N/A |
| LLF | No Prefix Assigned | N/A |
| LLG | No Prefix Assigned | N/A |
| LLH | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LLI | No Prefix Assigned | N/A |
| LLJ | No Prefix Assigned | N/A |
| LLK | Wellmark BCBS | Iowa, South DakotaIowa |
| LLL | BCBS of Texas | Texas |
| LLM | Highmark BCBS of Pennsylvania | Pennsylvania |
| LLN | Anthem BCBS of Ohio | Ohio |
| LLO | No Prefix Assigned | N/A |
| LLP | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LLQ | Anthem BCBS of Connecticut | Connecticut |
| LLR | Highmark BCBS of Pennsylvania | Pennsylvania |
| LLS | BCBS of Illinois | Illinois |
| LLT | Anthem Blue-Cross | California |
| LLU | No Prefix Assigned | N/A |
| LLV | Blue Shield of California | California |
| LLW | Anthem BCBS of Wisconsin | Wisconsin |
| LLX | Empire BCBS of New York | New York |
| LLY | Anthem BCBS of Ohio | Ohio |
| LLZ | Anthem BCBS of Virginia | Virginia |
| LMA | No Prefix Assigned | N/A |
| LMB | Anthem BCBS of Ohio | Ohio |
| LMC | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LMD | Empire BCBS of New York | New York |
| LME | Anthem Blue-Cross | California |
| LMF | BCBS of Nebraska | Nebraska |
| LMG | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LMH | Anthem BCBS of Ohio | Ohio |
| LMI | No Prefix Assigned | N/A |
| LMJ | Anthem BCBS of Wisconsin | Wisconsin |
| LMK | Anthem BCBS of Indiana | Indiana |
| LML | Anthem BCBS of Kentucky | Kentucky |
| LMM | BCBS of Vermont | Vermont |
| LMN | Anthem BCBS of Connecticut | Connecticut |
| LMO | No Prefix Assigned | N/A |
| LMP | Anthem BCBS of Virginia | Virginia |
| LMQ | No Prefix Assigned | N/A |
| LMR | Anthem Blue-Cross | California |
| LMS | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LMT | No Prefix Assigned | N/A |
| LMU | No Prefix Assigned | N/A |
| LMV | Anthem BCBS of Kentucky | Kentucky |
| LMW | Anthem BCBS of Wisconsin | Wisconsin |
| LMX | Wellmark BCBS | Iowa, South DakotaIowa |
| LMY | No Prefix Assigned | N/A |
| LMZ | Anthem BCBS of Ohio | Ohio |
| LNA | Wellmark BCBS | Iowa, South DakotaIowa |
| LNB | BCBS of Illinois | Illinois |
| LNC | Anthem BCBS of Ohio | Ohio |
| LND | No Prefix Assigned | N/A |
| LNE | Wellmark BCBS | Iowa, South DakotaIowa |
| LNF | Anthem BCBS of Virginia | Virginia |
| LNG | BCBS of Michigan | Michigan |
| LNH | BCBS of South Carolina | South Carolina |
| LNI | No Prefix Assigned | N/A |
| LNJ | No Prefix Assigned | N/A |
| LNK | Anthem BCBS of Wisconsin | Wisconsin |
| LNL | Anthem Blue-Cross | California |
| LNM | BCBS of Minnesota | Minnesota |
| LNN | BCBS of North Carolina | North Carolina |
| LNO | BCBS of Alabama | Alabama |
| LNP | BCBS of Alabama | Alabama |
| LNQ | No Prefix Assigned | N/A |
| LNR | Anthem BCBS of Wisconsin | Wisconsin |
| LNS | BCBS of Alabama | Alabama |
| LNT | BCBS of Arizona | Arizona |
| LNU | Empire BCBS of New York | New York |
| LNV | Anthem Blue-Cross | California |
| LNW | Highmark BCBS of Pennsylvania | Pennsylvania |
| LNX | Anthem BCBS of Wisconsin | Wisconsin |
| LNY | Wellmark BCBS | Iowa, South DakotaIowa |
| LNZ | BCBS of Alabama | Alabama |
| LOA | BCBS of Minnesota | Minnesota |
| LOB | BCBS of Minnesota | Minnesota |
| LOC | No Prefix Assigned | N/A |
| LOD | No Prefix Assigned | N/A |
| LOE | Anthem Blue-Cross | California |
| LOF | Anthem BCBS of Indiana | Indiana |
| LOG | BCBS of Rhode Island | Rhode Island |
| LOH | Anthem BCBS of Virginia | Virginia |
| LOI | Blue Shield of California | California |
| LOJ | BCBS of Michigan | Michigan |
| LOK | Highmark BCBS of Pennsylvania | Pennsylvania |
| LOL | BCBS of Minnesota | Minnesota |
| LOM | Highmark BCBS of Pennsylvania | Pennsylvania |
| LON | Anthem BCBS of Ohio | Ohio |
| LOO | No Prefix Assigned | N/A |
| LOP | No Prefix Assigned | N/A |
| LOQ | Anthem BCBS of Georgia | Georgia |
| LOR | BCBS of Illinois | Illinois |
| LOS | Anthem BCBS of Colorado | Colorado |
| LOT | No Prefix Assigned | N/A |
| LOU | No Prefix Assigned | N/A |
| LOV | No Prefix Assigned | N/A |
| LOW | BCBS of Michigan | Michigan |
| LOX | Blue Shield of California | California |
| LOY | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LOZ | Highmark BCBS of Pennsylvania | Pennsylvania |
| LPA | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LPB | No Prefix Assigned | N/A |
| LPC | No Prefix Assigned | N/A |
| LPD | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LPE | Highmark BCBS of Pennsylvania | Pennsylvania |
| LPF | No Prefix Assigned | N/A |
| LPG | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LPH | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LPI | BCBS of Texas | Texas |
| LPJ | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LPK | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LPL | No Prefix Assigned | N/A |
| LPM | No Prefix Assigned | N/A |
| LPN | No Prefix Assigned | N/A |
| LPO | Highmark BCBS of Pennsylvania | Pennsylvania |
| LPP | Empire BCBS of New York | New York |
| LPQ | BCBS of Michigan | Michigan |
| LPR | Anthem BCBS of Ohio | Ohio |
| LPS | Premera BCBS of Alaska | Alaska |
| LPT | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LPU | Anthem Blue-Cross | California |
| LPV | Highmark BCBS of Pennsylvania | Pennsylvania |
| LPW | No Prefix Assigned | N/A |
| LPX | BCBS of Tennessee | Tennessee |
| LPY | Highmark BCBS of Pennsylvania | Pennsylvania |
| LPZ | Anthem Blue-Cross | California |
| LQA | BCBS of Alabama | Alabama |
| LQB | BCBS of Western New York | New York (Western) |
| LQC | No Prefix Assigned | N/A |
| LQD | No Prefix Assigned | N/A |
| LQE | No Prefix Assigned | N/A |
| LQF | BCBS of Tennessee | Tennessee |
| LQG | BCBS of Tennessee | Tennessee |
| LQH | Wellmark BCBS | Iowa, South DakotaIowa |
| LQI | No Prefix Assigned | N/A |
| LQJ | No Prefix Assigned | N/A |
| LQK | Wellmark BCBS | Iowa, South DakotaIowa |
| LQL | Premera BCBS of Alaska | Alaska |
| LQM | No Prefix Assigned | N/A |
| LQN | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LQO | Anthem BCBS of Ohio | Ohio |
| LQP | BCBS of Rhode Island | Rhode Island |
| LQQ | No Prefix Assigned | N/A |
| LQR | BCBS of Illinois | Illinois |
| LQS | BCBS of Massachusetts | Massachusetts |
| LQT | BCBS of Illinois | Illinois |
| LQU | BCBS of Michigan | Michigan |
| LQV | No Prefix Assigned | N/A |
| LQW | Florida-Blue | Florida |
| LQX | No Prefix Assigned | N/A |
| LQY | Anthem BCBS of Ohio | Ohio |
| LQZ | Anthem BCBS of Georgia | Georgia |
| LRA | BCBS of Tennessee | Tennessee |
| LRB | No Prefix Assigned | N/A |
| LRC | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LRD | BCBS of Tennessee | Tennessee |
| LRE | BCBS of Tennessee | Tennessee |
| LRF | Anthem BCBS of Missouri | Missouri |
| LRG | No Prefix Assigned | N/A |
| LRH | Wellmark BCBS | Iowa, South DakotaIowa |
| LRI | No Prefix Assigned | N/A |
| LRJ | BCBS of Minnesota | Minnesota |
| LRK | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LRL | Highmark BCBS of Pennsylvania | Pennsylvania |
| LRM | No Prefix Assigned | N/A |
| LRN | No Prefix Assigned | N/A |
| LRO | BCBS of Alabama | Alabama |
| LRP | BCBS of Michigan | Michigan |
| LRQ | BCBS of Michigan | Michigan |
| LRR | Premera BCBS of Alaska | Alaska |
| LRS | BCBS of Michigan | Michigan |
| LRT | BCBS of Minnesota | Minnesota |
| LRU | Anthem Blue-Cross | California |
| LRV | No Prefix Assigned | N/A |
| LRW | No Prefix Assigned | N/A |
| LRX | Anthem BCBS of Georgia | Georgia |
| LRY | Anthem BCBS of New Hampshire | New Hampshire |
| LRZ | Wellmark BCBS | Iowa, South DakotaIowa |
| LSA | Anthem Blue-Cross | California |
| LSB | BCBS of Illinois | Illinois |
| LSC | Florida-Blue | Florida |
| LSD | BCBS of Illinois | Illinois |
| LSE | Anthem Blue-Cross | California |
| LSF | Florida-Blue | Florida |
| LSG | Wellmark BCBS | Iowa, South DakotaIowa |
| LSH | Horizon BCBS of New Jersey | New Jersey |
| LSI | No Prefix Assigned | N/A |
| LSJ | BCBS of Illinois | Illinois |
| LSK | Blue Shield of California | California |
| LSL | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LSM | Florida-Blue | Florida |
| LSN | Wellmark BCBS | Iowa, South DakotaIowa |
| LSO | Anthem BCBS of Wisconsin | Wisconsin |
| LSP | BCBS of Louisiana | Louisiana |
| LSQ | BCBS of South Carolina | South Carolina |
| LSR | BCBS of Kansas | Kansas |
| LSS | Anthem BCBS of Wisconsin | Wisconsin |
| LST | BCBS of North Carolina | North Carolina |
| LSU | No Prefix Assigned | N/A |
| LSV | No Prefix Assigned | N/A |
| LSW | Horizon BCBS of New Jersey | New Jersey |
| LSX | BCBS of Texas | Texas |
| LSY | Anthem BCBS of Wisconsin | Wisconsin |
| LSZ | No Prefix Assigned | N/A |
| LTA | Blue Shield of California | California |
| LTB | Anthem Blue-Cross | California |
| LTC | Anthem Blue-Cross | California |
| LTD | Wellmark BCBS | Iowa, South DakotaIowa |
| LTE | BCBS of North Carolina | North Carolina |
| LTF | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LTG | No Prefix Assigned | N/A |
| LTH | BCBS of Massachusetts | Massachusetts |
| LTI | No Prefix Assigned | N/A |
| LTJ | Highmark BCBS of Pennsylvania | Pennsylvania |
| LTK | BCBS of Minnesota | Minnesota |
| LTL | Anthem BCBS of Wisconsin | Wisconsin |
| LTM | No Prefix Assigned | N/A |
| LTN | No Prefix Assigned | N/A |
| LTO | BCBS of Nebraska | Nebraska |
| LTP | BCBS of Minnesota | Minnesota |
| LTQ | BCBS of South Carolina | South Carolina |
| LTR | BCBS of Michigan | Michigan |
| LTS | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LTT | Blue Shield of California | California |
| LTU | No Prefix Assigned | N/A |
| LTV | Highmark BCBS of Pennsylvania | Pennsylvania |
| LTW | Blue Shield of California | California |
| LTX | Blue Shield of California | California |
| LTY | Blue Shield of California | California |
| LTZ | BCBS of Minnesota | Minnesota |
| LUA | No Prefix Assigned | N/A |
| LUB | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LUC | Florida-Blue | Florida |
| LUD | No Prefix Assigned | N/A |
| LUE | Anthem Blue-Cross | California |
| LUF | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LUG | BCBS of Minnesota | Minnesota |
| LUH | Anthem BCBS of Missouri | Missouri |
| LUI | BCBS of Minnesota | Minnesota |
| LUJ | No Prefix Assigned | N/A |
| LUK | Anthem BCBS of Ohio | Ohio |
| LUL | BCBS of Minnesota | Minnesota |
| LUM | Anthem BCBS of Ohio | Ohio |
| LUN | Anthem BCBS of Virginia | Virginia |
| LUO | Anthem BCBS of Missouri | Missouri |
| LUP | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LUQ | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LUR | Premera BCBS of Alaska | Alaska |
| LUS | No Prefix Assigned | N/A |
| LUT | Capital Blue-Cross of Pennsylvania | Pennsylvania |
| LUU | BCBS of Tennessee | Tennessee |
| LUV | No Prefix Assigned | N/A |
| LUW | Wellmark BCBS | Iowa, South DakotaIowa |
| LUX | Anthem BCBS of Ohio | Ohio |
| LUY | BCBS of Michigan | Michigan |
| LUZ | No Prefix Assigned | N/A |
| LVA | Anthem BCBS of Wisconsin | Wisconsin |
| LVB | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LVC | Empire BCBS of New York | New York |
| LVD | No Prefix Assigned | N/A |
| LVE | BCBS of North Carolina | North Carolina |
| LVF | Anthem BCBS of Virginia | Virginia |
| LVG | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LVH | Highmark BCBS of Pennsylvania | Pennsylvania |
| LVI | No Prefix Assigned | N/A |
| LVJ | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LVK | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LVL | Highmark BCBS of Pennsylvania | Pennsylvania |
| LVM | BCBS of Michigan | Michigan |
| LVN | Premera BCBS of Alaska | Alaska |
| LVO | Highmark BCBS of Pennsylvania | Pennsylvania |
| LVP | No Prefix Assigned | N/A |
| LVQ | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LVR | No Prefix Assigned | N/A |
| LVS | Arkansas BCBS | Arkansas |
| LVT | Anthem BCBS of Georgia | Georgia |
| LVU | No Prefix Assigned | N/A |
| LVV | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LVW | No Prefix Assigned | N/A |
| LVX | Anthem Blue-Cross | California |
| LVY | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LVZ | No Prefix Assigned | N/A |
| LWA | BCBS of South Carolina | South Carolina |
| LWB | Wellmark BCBS | Iowa, South DakotaIowa |
| LWC | BCBS of Western New York | New York (Western) |
| LWD | BCBS of South Carolina | South Carolina |
| LWE | BCBS of Alabama | Alabama |
| LWF | Wellmark BCBS | Iowa, South DakotaIowa |
| LWG | BCBS of Michigan | Michigan |
| LWH | No Prefix Assigned | N/A |
| LWI | No Prefix Assigned | N/A |
| LWJ | BCBS of Illinois | Illinois |
| LWK | Empire BCBS of New York | New York |
| LWL | Empire BCBS of New York | New York |
| LWM | BCBS of Minnesota | Minnesota |
| LWN | Highmark BCBS of Pennsylvania | Pennsylvania |
| LWO | Anthem BCBS of Ohio | Ohio |
| LWP | Empire BCBS of New York | New York |
| LWQ | BCBS of Michigan | Michigan |
| LWR | Horizon BCBS of New Jersey | New Jersey |
| LWS | BCBS of Tennessee | Tennessee |
| LWT | BCBS of Tennessee | Tennessee |
| LWU | No Prefix Assigned | N/A |
| LWV | Highmark BCBS of Pennsylvania | Pennsylvania |
| LWW | Excellus BCBS of New York | New York |
| LWX | No Prefix Assigned | N/A |
| LWY | No Prefix Assigned | N/A |
| LWZ | BCBS of North Carolina | North Carolina |
| LXA | BCBS of Minnesota | Minnesota |
| LXB | Highmark BCBS of Pennsylvania | Pennsylvania |
| LXC | No Prefix Assigned | N/A |
| LXD | Highmark BCBS of Pennsylvania | Pennsylvania |
| LXE | No Prefix Assigned | N/A |
| LXF | BCBS of Louisiana | Louisiana |
| LXG | BCBS of Minnesota | Minnesota |
| LXH | No Prefix Assigned | N/A |
| LXI | Anthem BCBS of Kentucky | Kentucky |
| LXJ | Anthem BCBS of Kentucky | Kentucky |
| LXK | BCBS of Western New York | New York (Western) |
| LXL | Anthem BCBS of Kentucky | Kentucky |
| LXM | Blue Shield of California | California |
| LXN | Blue Shield of California | California |
| LXO | BCBS of Rhode Island | Rhode Island |
| LXP | BCBS of Michigan | Michigan |
| LXQ | No Prefix Assigned | N/A |
| LXR | BCBS of Illinois | Illinois |
| LXS | BCBS of Louisiana | Louisiana |
| LXT | Wellmark BCBS | Iowa, South DakotaIowa |
| LXU | No Prefix Assigned | N/A |
| LXV | BCBS of Michigan | Michigan |
| LXW | Anthem BCBS of Ohio | Ohio |
| LXX | BCBS of Minnesota | Minnesota |
| LXY | BCBS of Michigan | Michigan |
| LXZ | Premera BCBS of Alaska | Alaska |
| LYA | No Prefix Assigned | N/A |
| LYB | Highmark BCBS of Pennsylvania | Pennsylvania |
| LYC | Anthem Blue-Cross | California |
| LYD | No Prefix Assigned | N/A |
| LYE | Carefirst BCBS | Columbia, Maryland, N.virginia |
| LYF | BCBS of Michigan | Michigan |
| LYG | Blue Shield of California | California |
| LYH | Anthem BCBS of Ohio | Ohio |
| LYI | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LYJ | Anthem BCBS of Ohio | Ohio |
| LYK | No Prefix Assigned | N/A |
| LYL | BCBS of Texas | Texas |
| LYM | Regence BCBS | Idaho, Oregon, Utah, Washington |
| LYN | Wellmark BCBS | Iowa, South DakotaIowa |
| LYO | BCBS of Louisiana | Louisiana |
| LYP | BCBS of Louisiana | Louisiana |
| LYQ | BCBS of Tennessee | Tennessee |
| LYR | No Prefix Assigned | N/A |
| LYS | No Prefix Assigned | N/A |
| LYT | Anthem BCBS of Virginia | Virginia |
| LYU | BCBS of Alabama | Alabama |
| LYV | Anthem BCBS of Virginia | Virginia |
| LYW | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania | Pennsylvania |
| LYX | No Prefix Assigned | N/A |
| LYY | Anthem Blue-Cross | California |
| LYZ | Wellmark BCBS | Iowa, South DakotaIowa |
| LZA | No Prefix Assigned | N/A |
| LZB | BCBS of Louisiana | Louisiana |
| LZC | BCBS of Michigan | Michigan |
| LZD | Wellmark BCBS | Iowa, South DakotaIowa |
| LZE | Empire BCBS of New York | New York |
| LZF | BCBS of Illinois | Illinois |
| LZG | BCBS of Michigan | Michigan |
| LZH | Wellmark BCBS | Iowa, South DakotaIowa |
| LZI | No Prefix Assigned | N/A |
| LZJ | Anthem BCBS of Wisconsin | Wisconsin |
| LZK | Anthem BCBS of Wisconsin | Wisconsin |
| LZL | No Prefix Assigned | N/A |
| LZM | No Prefix Assigned | N/A |
| LZN | Anthem BCBS of Wisconsin | Wisconsin |
| LZO | Blue Shield of California | California |
| LZP | BCBS of Michigan | Michigan |
| LZQ | BCBS of Western New York | New York (Western) |
| LZR | BCBS of Nebraska | Nebraska |
| LZS | Wellmark BCBS | Iowa, South DakotaIowa |
| LZT | No Prefix Assigned | N/A |
| LZU | Horizon BCBS of New Jersey | New Jersey |
| LZV | Anthem BCBS of Connecticut | Connecticut |
| LZW | BCBS of Illinois | Illinois |
| LZX | Anthem BCBS of Connecticut | Connecticut |
| LZY | Premera BCBS of Alaska | Alaska |
| LZZ | BCBS of Massachusetts | Massachusetts |
| L2S | Premera Blue Cross | N/A |
| L3M | Premera Blue Cross | N/A |
| L4D | Premera Blue Cross | N/A |
| L4N | Premera Blue Cross | N/A |
| L5N | Premera Blue Cross | N/A |
| L5T | Premera Blue Cross | N/A |
