| YAA | Anthem BCBS of Connecticut (CT) |
| YAB | Regence BCBS |
| YAC | Anthem BCBS of Kentucky (KY) |
| YAD | BCBS of Rhode Island (RI) |
| YAE | Anthem BCBS of Virginia (VA) |
| YAF | Anthem BCBS of Colorado (CO) |
| YAG | BCBS of Mississippi (MS) |
| YAH | Anthem BCBS of Connecticut (CT) |
| YAI | BCBS of Mississippi (MS) |
| YAJ | BCBS of Alabama (AL) |
| YAK | Unassigned Prefix |
| YAL | Regence BCBS |
| YAM | Unassigned Prefix |
| YAN | Unassigned Prefix |
| YAO | Unassigned Prefix |
| YAP | BCBS of Minnesota (MN) |
| YAQ | BCBS of Mississippi (MS) |
| YAR | Unassigned Prefix |
| YAS | BCBS of Mississippi (MS) |
| YAT | Blue shield(BS) of California (CA) |
| YAU | BCBS of Mississippi (MS) |
| YAV | BCBS of Tennessee (TN) |
| YAW | Unassigned Prefix |
| YAX | BCBS of Mississippi (MS) |
| YAY | Wellmark |
| YAZ | Empire BCBS of New York (NY) |
| YBA | BCBS of Kansas City |
| YBB | BCBS of Kansas City |
| YBC BCBS Prefix | BCBS of Kansas City |
| YBD | BCBS of Kansas City |
| YBE | BCBS of Kansas City |
| YBF | BCBS of Kansas City |
| YBG | BCBS of Kansas City |
| YBH | BCBS of Kansas City |
| YBI | Anthem BCBS of Missouri (MO) |
| YBJ | BCBS of Kansas City |
| YBK | Anthem BCBS of Ohio (OH) |
| YBL | Anthem BCBS of Kentucky (KY) |
| YBM | BCBS of Kansas City |
| YBN | Empire BCBS of New York (NY) |
| YBO | BCBS of Massachusetts (MA) |
| YBP | BCBS of Kansas City |
| YBQ | Anthem Blue Cross(BC) of California (CA) |
| YBR | Blue shield(BS) of California (CA) |
| YBS | BCBS of Kansas City |
| YBT | BCBS of Kansas City |
| YBU | BCBS of Kansas City |
| YBV | Empire BCBS of New York (NY) |
| YBW | BCBS of Kansas City |
| YBX | BCBS of Kansas City |
| YBY | BCBS of Minnesota (MN) |
| YBZ | Unassigned Prefix |
| YCA | Anthem BCBS of Missouri (MO) |
| YCB | Anthem BCBS of Missouri (MO) |
| YCC | Anthem BCBS of Missouri (MO) |
| YCD | Anthem BCBS of Missouri (MO) |
| YCE | Anthem BCBS of Missouri (MO) |
| YCF | Anthem BCBS of Missouri (MO) |
| YCG | Anthem BCBS of Missouri (MO) |
| YCH | Unassigned Prefix |
| YCI | Capital Blue Cross of Pennsylvania (PA) |
| YCJ | Anthem BCBS of Kentucky (KY) |
| YCK | Anthem BCBS of Ohio (OH) |
| YCL | Anthem Blue Cross(BC) of California (CA) |
| YCM | Anthem BCBS of Wisconsin (WI) |
| YCN | Wellmark |
| YCO | BCBS of Minnesota (MN) |
| YCP | Regence BCBS |
| YCQ | Anthem BCBS of Indiana (IN) |
| YCR | BCBS of Massachusetts (MA) |
| YCS | Anthem BCBS of Colorado (CO) |
| YCT | Anthem BCBS of Connecticut (CT) |
| YCU | Anthem BCBS of Missouri (MO) |
| YCV | Unassigned Prefix |
| YCW | Blue Cross (BC) of Idaho (ID) |
| YCX | Anthem BCBS of Georgia (GA) |
| YCY | Anthem Blue Cross(BC) of California (CA) |
| YCZ | Empire BCBS of New York (NY) |
| YDA | Unassigned Prefix |
| YDB | BCBS of Nebraska (NE) |
| YDC | BCBS of Montana (MT) |
| YDD | BCBS of Montana (MT) |
| YDE | BCBS of Montana (MT) |
| YDF | BCBS of Montana (MT) |
| YDG | BCBS of Montana (MT) |
| YDH | Anthem Blue Cross(BC) of California (CA) |
| YDI | Unassigned Prefix |
| YDJ | BCBS of Montana (MT) |
| YDK | BCBS of Montana (MT) |
| YDL | BCBS of Montana (MT) |
| YDM | BCBS of Montana (MT) |
| YDN | BCBS of Montana (MT) |
| YDO | BCBS of Rhode Island (RI) |
| YDP | Anthem BCBS of Kentucky (KY) |
| YDQ | Anthem BCBS of Ohio (OH) |
| YDR | BCBS of Montana (MT) |
| YDS | BCBS of Montana (MT) |
| YDT | BCBS of Montana (MT) |
| YDU | BCBS of Montana (MT) |
| YDV | BCBS of Montana (MT) |
| YDW | Premera BCBS of Alaska (AK) |
| YDX | BCBS of Texas (TX) |
| YDY | Empire BCBS of New York (NY) |
| YDZ | BCBS of Western New York (WNY) |
| YEA | Unassigned Prefix |
| YEB | Blue shield(BS) of California (CA) |
| YEC | BCBS of Massachusetts (MA) |
| YED | BCBS of Nebraska (NE) |
| YEE | Blue shield(BS) of California (CA) |
| YEF | BCBS of Nebraska (NE) |
| YEG | BCBS of Nebraska (NE) |
| YEH | BCBS of Nebraska (NE) |
| YEI | BCBS of North Dakota (ND) |
| YEJ | Unassigned Prefix |
| YEK | BCBS of Nebraska (NE) |
| YEL | BCBS of Minnesota (MN) |
| YEM | BCBS of Nebraska (NE) |
| YEN | Unassigned Prefix |
| YEO | BCBS of North Dakota (ND) |
| YEP | BCBS of North Dakota (ND) |
| YEQ | BCBS of Nebraska (NE) |
| YER | BCBS of North Dakota (ND) |
| YES | BCBS of Nebraska (NE) |
| YET | BCBS of Illinois (IL) |
| YEU | Unassigned Prefix |
| YEV | Blue shield(BS) of California (CA) |
| YEW | Empire BCBS of New York (NY) |
| YEX | Anthem BCBS of Ohio (OH) |
| YEY | Empire BCBS of New York (NY) |
| YEZ | BCBS of Nebraska (NE) |
| YFA | Anthem BCBS of Nevada (NV) |
| YFB | Anthem BCBS of Nevada (NV) |
| YFC | Anthem BCBS of Nevada (NV) |
| YFD | Anthem BCBS of Nevada (NV) |
| YFE | BCBS of Illinois (IL) |
| YFF | Anthem BCBS of Nevada (NV) |
| YFG | Anthem BCBS of Nevada (NV) |
| YFH | Anthem BCBS of Nevada (NV) |
| YFI | Anthem BCBS of Nevada (NV) |
| YFJ | Anthem BCBS of Nevada (NV) |
| YFK | Anthem BCBS of Nevada (NV) |
| YFL | Anthem BCBS of Nevada (NV) |
| YFM | BCBS of Nebraska (NE) |
| YFN | Anthem BCBS of Nevada (NV) |
| YFO | Anthem BCBS of Nevada (NV) |
| YFP | Anthem BCBS of Nevada (NV) |
| YFQ | Unassigned Prefix |
| YFR | Anthem BCBS of Nevada (NV) |
| YFS | Anthem BCBS of Ohio (OH) |
| YFT | Anthem BCBS of Nevada (NV) |
| YFU | Anthem BCBS of Nevada (NV) |
| YFV | Anthem BCBS of Connecticut (CT) |
| YFW | Anthem BCBS of Nevada (NV) |
| YFX | Anthem BCBS of Nevada (NV) |
| YFY | Anthem BCBS of Nevada (NV) |
| YFZ | Anthem BCBS of Nevada (NV) |
| YGA | Anthem BCBS of New Hampshire (NH) |
| YGB | Anthem BCBS of New Hampshire (NH) |
| YGC | Anthem BCBS of New Hampshire (NH) |
| YGD | Anthem BCBS of New Hampshire (NH) |
| YGE | Anthem BCBS of New Hampshire (NH) |
| YGF | Anthem BCBS of New Hampshire (NH) |
| YGG | Anthem BCBS of New Hampshire (NH) |
| YGH | Anthem BCBS of New Hampshire (NH) |
| YGI | Anthem BCBS of New Hampshire (NH) |
| YGJ | Anthem BCBS of New Hampshire (NH) |
| YGK | Anthem BCBS of New Hampshire (NH) |
| YGL | Anthem BCBS of New Hampshire (NH) |
| YGM | Anthem BCBS of New Hampshire (NH) |
| YGN | Anthem BCBS of New Hampshire (NH) |
| YGO | Anthem BCBS of New Hampshire (NH) |
| YGP | Anthem BCBS of New Hampshire (NH) |
| YGQ | Anthem BCBS of New Hampshire (NH) |
| YGR | Anthem BCBS of New Hampshire (NH) |
| YGS | Anthem BCBS of New Hampshire (NH) |
| YGT | Unassigned Prefix |
| YGU | Anthem BCBS of New Hampshire (NH) |
| YGV | Anthem BCBS of New Hampshire (NH) |
| YGW | Anthem BCBS of New Hampshire (NH) |
| YGX | Anthem BCBS of New Hampshire (NH) |
| YGY | Blue shield(BS) of California (CA) |
| YGZ | Anthem BCBS of Georgia (GA) |
| YHA | Horizon BCBS of New Jersey (NJ) |
| YHB | Horizon BCBS of New Jersey (NJ) |
| YHC | Unassigned Prefix |
| YHD | Horizon BCBS of New Jersey (NJ) |
| YHE | Horizon BCBS of New Jersey (NJ) |
| YHF | Horizon BCBS of New Jersey (NJ) |
| YHG | Horizon BCBS of New Jersey (NJ) |
| YHH | Anthem BCBS of Connecticut (CT) |
| YHI | BCBS of North Carolina (NC) |
| YHJ | Anthem BCBS of Indiana (IN) |
| YHK | Anthem BCBS of Indiana (IN) |
| YHL | Horizon BCBS of New Jersey (NJ) |
| YHM | Wellmark |
| YHN | Horizon BCBS of New Jersey (NJ) |
| YHO | Horizon BCBS of New Jersey (NJ) |
| YHP | Horizon BCBS of New Jersey (NJ) |
| YHQ | Horizon BCBS of New Jersey (NJ) |
| YHR | Horizon BCBS of New Jersey (NJ) |
| YHS | Wellmark |
| YHT | Anthem BCBS of Indiana (IN) |
| YHU | Anthem BCBS of Indiana (IN) |
| YHV | Anthem BCBS of Indiana (IN) |
| YHW | Horizon BCBS of New Jersey (NJ) |
| YHX | Horizon BCBS of New Jersey (NJ) |
| YHY | Horizon BCBS of New Jersey (NJ) |
| YHZ | Horizon BCBS of New Jersey (NJ) |
| YIA | BCBS of New Mexico (NM) |
| YIB | BCBS of New Mexico (NM) |
| YIC | BCBS of New Mexico (NM) |
| YID | BCBS of New Mexico (NM) |
| YIE | BCBS of New Mexico (NM) |
| YIF | BCBS of New Mexico (NM) |
| YIG | BCBS of New Mexico (NM) |
| YIH | BCBS of New Mexico (NM) |
| YII | BCBS of New Mexico (NM) |
| YIJ | BCBS of New Mexico (NM) |
| YIK | BCBS of New Mexico (NM) |
| YIL | BCBS of New Mexico (NM) |
| YIM | BCBS of New Mexico (NM) |
| YIN | BCBS of New Mexico (NM) |
| YIO | Unassigned Prefix |
| YIP | BCBS of New Mexico (NM) |
| YIQ | Unassigned Prefix |
| YIR | BCBS of New Mexico (NM) |
| YIS | BCBS of New Mexico (NM) |
| YIT | BCBS of New Mexico (NM) |
| YIU | BCBS of New Mexico (NM) |
| YIV | BCBS of New Mexico (NM) |
| YIW | BCBS of New Mexico (NM) |
| YIX | BCBS of New Mexico (NM) |
| YIY | BCBS of New Mexico (NM) |
| YIZ | BCBS of New Mexico (NM) |
| YJA | BCBS of Western New York (WNY) |
| YJB | BCBS of Western New York (WNY) |
| YJC | BCBS of Western New York (WNY) |
| YJD | BCBS of Western New York (WNY) |
| YJE | BCBS of Western New York (WNY) |
| YJF | BCBS of Western New York (WNY) |
| YJG | BCBS of Western New York (WNY) |
| YJH | BCBS of Western New York (WNY) |
| YJI | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| YJJ | BCBS of Kansas City |
| YJK | BCBS of Western New York (WNY) |
| YJL | BCBS of Western New York (WNY) |
| YJM | BCBS of Western New York (WNY) |
| YJN | BCBS of Western New York (WNY) |
| YJO | BCBS of Western New York (WNY) |
| YJP | BCBS of Western New York (WNY) |
| YJQ | BCBS of Western New York (WNY) |
| YJR | BCBS of Western New York (WNY) |
| YJS | BCBS of Western New York (WNY) |
| YJT | BCBS of Kansas City |
| YJU | BCBS of Western New York (WNY) |
| YJV | BCBS of Kansas City |
| YJW | BCBS of Kansas City |
| YJX | BCBS of Western New York (WNY) |
| YJY | BCBS of Western New York (WNY) |
| YJZ | BCBS of Western New York (WNY) |
| YKA | Horizon BCBS of New Jersey (NJ) |
| YKB | Horizon BCBS of New Jersey (NJ) |
| YKC | Horizon BCBS of New Jersey (NJ) |
| YKD | Horizon BCBS of New Jersey (NJ) |
| YKE | Horizon BCBS of New Jersey (NJ) |
| YKF | Horizon BCBS of New Jersey (NJ) |
| YKG | Horizon BCBS of New Jersey (NJ) |
| YKH | Horizon BCBS of New Jersey (NJ) |
| YKI | Horizon BCBS of New Jersey (NJ) |
| YKJ | Horizon BCBS of New Jersey (NJ) |
| YKK | Horizon BCBS of New Jersey (NJ) |
| YKL | Horizon BCBS of New Jersey (NJ) |
| YKM | Horizon BCBS of New Jersey (NJ) |
| YKN | Wellmark |
| YKO | Horizon BCBS of New Jersey (NJ) |
| YKP | Wellmark |
| YKQ | Horizon BCBS of New Jersey (NJ) |
| YKR | Horizon BCBS of New Jersey (NJ) |
| YKS | Horizon BCBS of New Jersey (NJ) |
| YKT | Horizon BCBS of New Jersey (NJ) |
| YKU | Horizon BCBS of New Jersey (NJ) |
| YKV | BCBS of Nebraska (NE) |
| YKW | Anthem BCBS of Ohio (OH) |
| YKX | Anthem BCBS of Colorado (CO) |
| YKY | Anthem BCBS of Ohio (OH) |
| YKZ | Horizon BCBS of New Jersey (NJ) |
| YLA | Empire BCBS of New York (NY) |
| YLB | Empire BCBS of New York (NY) |
| YLC | Empire BCBS of New York (NY) |
| YLD | Empire BCBS of New York (NY) |
| YLE | Empire BCBS of New York (NY) |
| YLF | Empire BCBS of New York (NY) |
| YLG | Unassigned Prefix |
| YLH | Empire BCBS of New York (NY) |
| YLI | BCBS Blue Care Network Michigan (MI) |
| YLJ | Empire BCBS of New York (NY) |
| YLK | Empire BCBS of New York (NY) |
| YLL | Empire BCBS of New York (NY) |
| YLM | Empire BCBS of New York (NY) |
| YLN | Empire BCBS of New York (NY) |
| YLO | Empire BCBS of New York (NY) |
| YLP | Empire BCBS of New York (NY) |
| YLQ | Empire BCBS of New York (NY) |
| YLR | Empire BCBS of New York (NY) |
| YLS BCBS Prefix | Empire BCBS of New York (NY) |
| YLT | Empire BCBS of New York (NY) |
| YLU | Empire BCBS of New York (NY) |
| YLV | Empire BCBS of New York (NY) |
| YLW | Empire BCBS of New York (NY) |
| YLX | Empire BCBS of New York (NY) |
| YLY | Empire BCBS of New York (NY) |
| YLZ | Empire BCBS of New York (NY) |
| YMA | BCBS of Nebraska (NE) |
| YMB | Anthem BCBS of Missouri (MO) |
| YMC | Highmark BCBS of Pennsylvania (PA) |
| YMD | Highmark BCBS of Delaware (DE) |
| YME | BCBS of North Dakota (ND) |
| YMF | BCBS of Illinois (IL) |
| YMG | BCBS of Minnesota (MN) |
| YMH | Unassigned Prefix |
| YMI | Anthem BCBS of Virginia (VA) |
| YMJ | Premera BCBS of Alaska (AK) |
| YMK | Premera BCBS of Alaska (AK) |
| YML | Premera BCBS of Alaska (AK) |
| YMM | Unassigned Prefix |
| YMN | Unassigned Prefix |
| YMO | Anthem BCBS of Georgia (GA) |
| YMP | Empire BCBS of New York (NY) |
| YMQ | Anthem Blue Cross(BC) of California (CA) |
| YMR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| YMS | Blue shield(BS) of California (CA) |
| YMT | Blue Cross (BC) of Idaho (ID) |
| YMU | Anthem Blue Cross(BC) of California (CA) |
| YMV | Blue Cross (BC) of Idaho (ID) |
| YMW | Anthem BCBS of Connecticut (CT) |
| YMX | Premera Blue Cross (BC) of Alaska (AK) |
| YMY | Anthem Blue Cross(BC) of California (CA) |
| YMZ | Anthem BCBS of Missouri (MO) |
| YNA | Blue shield(BS) of California (CA) |
| YNB | Excellus BCBS of New York (NY) |
| YNC | Excellus BCBS of New York (NY) |
| YND | Excellus BCBS of New York (NY) |
| YNE | Excellus BCBS of New York (NY) |
| YNF | BCBS of Minnesota (MN) |
| YNG | Excellus BCBS of New York (NY) |
| YNH | Excellus BCBS of New York (NY) |
| YNI | Excellus BCBS of New York (NY) |
| YNJ | Excellus BCBS of New York (NY) |
| YNK | BCBS of Illinois (IL) |
| YNL | Excellus BCBS of New York (NY) |
| YNM | Excellus BCBS of New York (NY) |
| YNN | BCBS of Nebraska (NE) |
| YNO | Highmark BCBS of Pennsylvania (PA) |
| YNP | BCBS of Illinois (IL) |
| YNQ | BCBS of Nebraska (NE) |
| YNR | BCBS of North Dakota (ND) |
| YNS | Excellus BCBS of New York (NY) |
| YNT | Unassigned Prefix |
| YNU | BCBS of Illinois (IL) |
| YNV | Unassigned Prefix |
| YNW | Anthem Blue Cross(BC) of California (CA) |
| YNX | BCBS of Nebraska (NE) |
| YNY | Horizon BCBS of New Jersey (NJ) |
| YNZ | Horizon BCBS of New Jersey (NJ) |
| YOA | Blue shield(BS) of California (CA) |
| YOB | BCBS of Western New York (WNY) |
| YOC | Blue shield(BS) of California (CA) |
| YOD | Highmark BCBS of Pennsylvania (PA) |
| YOE | BCBS of Massachusetts (MA) |
| YOF | BCBS of Massachusetts (MA) |
| YOG | BCBS of Massachusetts (MA) |
| YOH | Highmark BCBS of Pennsylvania (PA) |
| YOI | BCBS of Massachusetts (MA) |
| YOJ | Anthem BCBS of Wisconsin (WI) |
| YOK | BCBS of Massachusetts (MA) |
| YOL | Highmark BCBS of Pennsylvania (PA) |
| YOM | BCBS of Massachusetts (MA) |
| YON | BCBS of Massachusetts (MA) |
| YOO | BCBS of Massachusetts (MA) |
| YOP | Regence BCBS |
| YOQ | Anthem BCBS of Ohio (OH) |
| YOR | Premera BCBS of Alaska (AK) |
| YOS | Anthem BCBS of Wisconsin (WI) |
| YOT | BCBS of Rhode Island (RI) |
| YOU | Blue shield(BS) of California (CA) |
| YOV | Highmark BCBS of Pennsylvania (PA) |
| YOW | BCBS of Massachusetts (MA) |
| YOX | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| YOY | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| YOZ | BCBS of Massachusetts (MA) |
| YPA | BCBS of North Carolina (NC) |
| YPB | BCBS of Rhode Island (RI) |
| YPC | Unassigned Prefix |
| YPD | BCBS of North Carolina (NC) |
| YPE | Unassigned Prefix |
| YPF | BCBS of North Carolina (NC) |
| YPG | Unassigned Prefix |
| YPH | BCBS of North Carolina (NC) |
| YPI BCBS Prefix | BCBS of North Carolina (NC) |
| YPJ | BCBS of North Carolina (NC) |
| YPK | BCBS of Rhode Island (RI) |
| YPL | BCBS of North Carolina (NC) |
| YPM | Unassigned Prefix |
| YPN | BCBS of North Carolina (NC) |
| YPO | BCBS of North Carolina (NC) |
| YPP | BCBS of North Carolina (NC) |
| YPQ | BCBS of North Carolina (NC) |
| YPR | Unassigned Prefix |
| YPS BCBS Prefix | BCBS of North Carolina (NC) |
| YPT | BCBS of North Carolina (NC) |
| YPU | BCBS of North Carolina (NC) |
| YPV | BCBS of North Carolina (NC) |
| YPW | BCBS of North Carolina (NC) |
| YPX | BCBS of North Carolina (NC) |
| YPY BCBS Prefix | BCBS of North Carolina (NC) |
| YPZ | BCBS of North Carolina (NC) |
| YQA | Unassigned Prefix |
| YQB | Unassigned Prefix |
| YQC | Unassigned Prefix |
| YQD | BCBS of North Dakota (ND) |
| YQE | Unassigned Prefix |
| YQF | BCBS of North Dakota (ND) |
| YQG | Unassigned Prefix |
| YQH | BCBS of North Dakota (ND) |
| YQI | Unassigned Prefix |
| YQJ | Unassigned Prefix |
| YQK | BCBS of North Dakota (ND) |
| YQL | BCBS of North Dakota (ND) |
| YQM | BCBS of North Dakota (ND) |
| YQN | BCBS of North Dakota (ND) |
| YQO | BCBS of North Dakota (ND) |
| YQP | Unassigned Prefix |
| YQQ | Unassigned Prefix |
| YQR | BCBS of North Dakota (ND) |
| YQS | Unassigned Prefix |
| YQT | BCBS of North Dakota (ND) |
| YQU | Unassigned Prefix |
| YQV | BCBS of North Dakota (ND) |
| YQW | BCBS of North Dakota (ND) |
| YQX | Unassigned Prefix |
| YQY | BCBS of North Dakota (ND) |
| YQZ | BCBS of Western New York (WNY) |
| YRA | Anthem BCBS of Ohio (OH) |
| YRB | Anthem BCBS of Ohio (OH) |
| YRC | Anthem BCBS of Virginia (VA) |
| YRD | Anthem BCBS of Missouri (MO) |
| YRE | Anthem BCBS of Ohio (OH) |
| YRF | Anthem BCBS of Ohio (OH) |
| YRG | Anthem BCBS of Ohio (OH) |
| YRH | Anthem BCBS of Indiana (IN) |
| YRI | Highmark BCBS of Pennsylvania (PA) |
| YRJ | Anthem BCBS of Ohio (OH) |
| YRK | Anthem BCBS of Indiana (IN) |
| YRL | Anthem BCBS of Ohio (OH) |
| YRM | Anthem BCBS of Ohio (OH) |
| YRN | Anthem BCBS of Ohio (OH) |
| YRO | Anthem BCBS of Ohio (OH) |
| YRP BCBS Prefix | Anthem BCBS of Ohio (OH) |
| YRQ | Anthem BCBS of Missouri (MO) |
| YRR | Anthem BCBS of Ohio (OH) |
| YRS | Anthem BCBS of Ohio (OH) |
| YRT | Anthem BCBS of Ohio (OH) |
| YRU | Anthem BCBS of Ohio (OH) |
| YRV | Anthem BCBS of Virginia (VA) |
| YRW | Anthem BCBS of Virginia (VA) |
| YRX | Anthem BCBS of Ohio (OH) |
| YRY | Anthem BCBS of Ohio (OH) |
| YRZ | Anthem BCBS of Virginia (VA) |
| YSA | Blue Cross (BC) of Idaho (ID) |
| YSB | BCBS of Massachusetts (MA) |
| YSC | BCBS of Minnesota (MN) |
| YSD | Anthem BCBS of Wisconsin (WI) |
| YSE | Unassigned Prefix |
| YSF | Anthem BCBS of Ohio (OH) |
| YSG | Blue shield(BS) of California (CA) |
| YSH | Unassigned Prefix |
| YSI | Unassigned Prefix |
| YSJ | Premera Blue Cross (BC) of Alaska (AK) |
| YSK | Unassigned Prefix |
| YSL | Premera BCBS of Alaska (AK) |
| YSM | BCBS of Alabama (AL) |
| YSN | Anthem Blue Cross(BC) of California (CA) |
| YSO | BCBS of Western New York (WNY) |
| YSP | Unassigned Prefix |
| YSQ | Anthem Blue Cross(BC) of California (CA) |
| YSR | BCBS of Texas (TX) |
| YSS | BCBS of Massachusetts (MA) |
| YST | Unassigned Prefix |
| YSU | Anthem BCBS of Georgia (GA) |
| YSV | Anthem BCBS of Virginia (VA) |
| YSW | Blue Cross (BC) of Idaho (ID) |
| YSX | BCBS of Rhode Island (RI) |
| YSY | Anthem BCBS of Ohio (OH) |
| YSZ | Anthem BCBS of Wisconsin (WI) |
| YTA | Anthem BCBS of Virginia (VA) |
| YTB | Anthem BCBS of Virginia (VA) |
| YTC | Anthem BCBS of Virginia (VA) |
| YTD | Anthem BCBS of Virginia (VA) |
| YTE | Anthem BCBS of Virginia (VA) |
| YTF | Anthem BCBS of Virginia (VA) |
| YTG | Unassigned Prefix |
| YTH | Anthem BCBS of Virginia (VA) |
| YTI | Anthem BCBS of Virginia (VA) |
| YTJ | Anthem BCBS of Virginia (VA) |
| YTK | Anthem BCBS of Virginia (VA) |
| YTL | Anthem BCBS of Virginia (VA) |
| YTM | Anthem BCBS of Virginia (VA) |
| YTN | Anthem BCBS of Virginia (VA) |
| YTO | Anthem BCBS of Virginia (VA) |
| YTP | Anthem BCBS of Virginia (VA) |
| YTQ | Unassigned Prefix |
| YTR | Anthem BCBS of Virginia (VA) |
| YTS | Anthem BCBS of Virginia (VA) |
| YTT | Anthem BCBS of Virginia (VA) |
| YTU | Anthem BCBS of Virginia (VA) |
| YTV | Anthem BCBS of Virginia (VA) |
| YTW | Anthem BCBS of Virginia (VA) |
| YTX | Anthem BCBS of Virginia (VA) |
| YTY | Unassigned Prefix |
| YTZ | Anthem BCBS of Virginia (VA) |
| YUA | BCBS of Oklahoma (OK) |
| YUB | BCBS of Oklahoma (OK) |
| YUC | Unassigned Prefix |
| YUD | BCBS of Oklahoma (OK) |
| YUE | Unassigned Prefix |
| YUF | BCBS of Oklahoma (OK) |
| YUG | BCBS of Oklahoma (OK) |
| YUH | BCBS of Oklahoma (OK) |
| YUI | BCBS of Oklahoma (OK) |
| YUJ | BCBS of Oklahoma (OK) |
| YUK | BCBS of Oklahoma (OK) |
| YUL | BCBS of Oklahoma (OK) |
| YUM | BCBS of Oklahoma (OK) |
| YUN | BCBS of Oklahoma (OK) |
| YOU | BCBS of Oklahoma (OK) |
| YUP BCBS Prefix | BCBS of Oklahoma (OK) |
| YUQ | BCBS of Oklahoma (OK) |
| YUR | BCBS of Oklahoma (OK) |
| YUS | BCBS of Oklahoma (OK) |
| YUT | BCBS of New Mexico (NM) |
| YUU | Unassigned Prefix |
| YUV | BCBS of Illinois (IL) |
| YUW | BCBS of Oklahoma (OK) |
| YUX | BCBS of Oklahoma (OK) |
| YUY | BCBS of Oklahoma (OK) |
| YUZ | BCBS of Oklahoma (OK) |
| YVA | Regence BCBS |
| YVB | Regence BCBS |
| YVC | Regence BCBS |
| YVD | Regence BCBS |
| YVE | Anthem BCBS of Virginia (VA) |
| YVF | Regence BCBS |
| YVG | Regence BCBS |
| YVH | Regence BCBS |
| YVI | Capital Blue Cross of Pennsylvania (PA) |
| YVJ | Anthem BCBS of Indiana (IN) |
| YVK | Anthem BCBS of Indiana (IN) |
| YVL | Regence BCBS |
| YVM | Regence BCBS |
| YVN | Regence BCBS |
| YVO | Regence BCBS |
| YVP | Regence BCBS |
| YVQ | Regence BCBS |
| YVR | Regence BCBS |
| YVS | Regence BCBS |
| YVT | Regence BCBS |
| YVU | Regence BCBS |
| YVV | Regence BCBS |
| YVW | Regence BCBS |
| YVX | Regence BCBS |
| YVY | Anthem BCBS of Connecticut (CT) |
| YVZ | Regence BCBS |
| YWA | Capital Blue Cross of Pennsylvania (PA) |
| YWB | Capital Blue Cross of Pennsylvania (PA) |
| YWC | Capital Blue Cross of Pennsylvania (PA) |
| YWD | Capital Blue Cross of Pennsylvania (PA) |
| YWE | Capital Blue Cross of Pennsylvania (PA) |
| YWF | Capital Blue Cross of Pennsylvania (PA) |
| YWG | Capital Blue Cross of Pennsylvania (PA) |
| YWH | Capital Blue Cross of Pennsylvania (PA) |
| YWI | Anthem BCBS of Wisconsin (WI) |
| YWJ | Capital Blue Cross of Pennsylvania (PA) |
| YWK | Capital Blue Cross of Pennsylvania (PA) |
| YWL | Anthem BCBS of Ohio (OH) |
| YWM | Capital Blue Cross of Pennsylvania (PA) |
| YWN | Capital Blue Cross of Pennsylvania (PA) |
| YWO | Anthem BCBS of Ohio (OH) |
| YWP BCBS Prefix | Capital Blue Cross of Pennsylvania (PA) |
| YWQ | Anthem BCBS of Indiana (IN) |
| YWR | Unassigned Prefix |
| YWS | Unassigned Prefix |
| YWT | Capital Blue Cross of Pennsylvania (PA) |
| YWU | Anthem BCBS of Indiana (IN) |
| YWV | Capital Blue Cross of Pennsylvania (PA) |
| YWW | Capital Blue Cross of Pennsylvania (PA) |
| YWX | Empire BCBS of New York (NY) |
| YWY | BCBS of Wyoming (WY) |
| YWZ | Capital Blue Cross of Pennsylvania (PA) |
| YXA | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXB | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXC | Empire BCBS of New York (NY) |
| YXD | Empire BCBS of New York (NY) |
| YXE | Empire BCBS of New York (NY) |
| YXF BCBS Prefix | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXG | Empire BCBS of New York (NY) |
| YXH | Anthem BCBS of Indiana (IN) |
| YXI | Unassigned Prefix |
| YXJ | Empire BCBS of New York (NY) |
| YXK | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXL | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXM | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXN | BCBS of Nebraska (NE) |
| YXO | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXP | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXQ | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXR | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXS | Empire BCBS of New York (NY) |
| YXT | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXU | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXV | Empire BCBS of New York (NY) |
| YXW | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXX | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXY | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YXZ | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| YYA | Highmark BCBS of Pennsylvania (PA) |
| YYB | Highmark BCBS of Pennsylvania (PA) |
| YYC | Highmark BCBS of Pennsylvania (PA) |
| YYD | Highmark BCBS of Pennsylvania (PA) |
| YYE | Unassigned Prefix |
| YYF | Highmark BCBS of Pennsylvania (PA) |
| YYG | Highmark BCBS of Pennsylvania (PA) |
| YYH | Highmark BCBS of Pennsylvania (PA) |
| YYI | Highmark BCBS of Pennsylvania (PA) |
| YYJ | Highmark BCBS of Pennsylvania (PA) |
| YYK | Highmark BCBS of Pennsylvania (PA) |
| YYL | Anthem BCBS of Connecticut (CT) |
| YYM BCBS Prefix | Highmark BCBS of Pennsylvania (PA) |
| YYN | Highmark BCBS of Pennsylvania (PA) |
| YYO | Highmark BCBS of Pennsylvania (PA) |
| YYP | Highmark BCBS of Pennsylvania (PA) |
| YYQ | Highmark BCBS of Pennsylvania (PA) |
| YYR | Highmark BCBS of Pennsylvania (PA) |
| YYS | Highmark BCBS of Pennsylvania (PA) |
| YYT | Highmark BCBS of Pennsylvania (PA) |
| YYU | Highmark BCBS of Pennsylvania (PA) |
| YYV | Highmark BCBS of Pennsylvania (PA) |
| YYW | Highmark BCBS of Pennsylvania (PA) |
| YYX | Highmark BCBS of Pennsylvania (PA) |
| YYY | Horizon BCBS of New Jersey (NJ) |
| YYZ | Highmark BCBS of Pennsylvania (PA) |
| YZA | Anthem BCBS of Kentucky (KY) |
| YZB | Anthem BCBS of Colorado (CO) |
| YZC | Anthem Blue Cross(BC) of California (CA) |
| YZD BCBS Prefix | Anthem BCBS of Indiana (IN) |
| YZE BCBS Prefix | Anthem BCBS of Kentucky (KY) |
| YZF | Anthem BCBS of Kentucky (KY) |
| YZG | Anthem BCBS of Kentucky (KY) |
| YZH | Unassigned Prefix |
| YZI | Anthem BCBS of Ohio (OH) |
| YZJ | Anthem BCBS of Kentucky (KY) |
| YZK | Anthem BCBS of Connecticut (CT) |
| YZL | BCBS of Nebraska (NE) |
| YZM | Unassigned Prefix |
| YZN | Anthem BCBS of Nevada (NV) |
| YZO | Anthem BCBS of Ohio (OH) |
| YZP | BCBS of Rhode Island (RI) |
| YZQ | Anthem BCBS of Ohio (OH) |
| YZR | Empire BCBS of New York (NY) |
| YZS | Anthem BCBS of Nevada (NV) |
| YZT | Anthem BCBS of Nevada (NV) |
| YZU | Anthem Blue Cross(BC) of California (CA) |
| YZV | Anthem BCBS of Nevada (NV) |
| YZW | BCBS of Western New York (WNY) |
| YZX | BCBS of Western New York (WNY) |
| YZY | Anthem BCBS of Ohio (OH) |
| YZZ | Anthem BCBS of Kentucky (KY) |
