BCBS Alpha Prefix List from OAA to OZZ
| BCBS Alpha Prefix List | Blue Cross Blue Shield Companies | BCBS Phone Numbers |
|---|---|---|
| OAB | Unassigned Prefix | |
| OAC | Anthem Central Region (OH, IN, KY) | |
| OAE | Unassigned Prefix | |
| OAF | Unassigned Prefix | |
| OAG | Anthem Blue Cross Blue Shield of Colorado | 877-833-5742 - HMO, Anthem BCBS PPO/Indemnity Plans 800-827-6422 - HMO Guest mebmership or Away from Home Care 866-438-9969 - Medicare Supplement Plans Anthem Associates and Retirees 877-833-5742 800-433-5447 800-234-0111 Anthem Dental 800-231-2583 800-627-0004 888-209-7852 Anthem Vision 800-231-2583 866-723-0515 800-433-5447 - National Par Accounts 888-817-3717 - Blue Card 800-676-2583 - Eligibility |
| OAK | Unassigned Prefix | |
| OAL | Unassigned Prefix | |
| OAM | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OAP | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OAR | Unassigned Prefix | |
| OAT | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| OAU | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OAY | Unassigned Prefix | |
| OBA | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OBB | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OBD | Unassigned Prefix | |
| OBE | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OBF | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OBG | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| OBH | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OBI | Blue Cross Blue Shield of Minnesota | 800-262-0820 |
| OBJ | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OBK | Anthem Central Region (OH, IN, KY) | |
| OBL | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OBM | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OBN | Unassigned Prefix | |
| OBO | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OBP | Unassigned Prefix | |
| OBR | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OBS | Unassigned Prefix | |
| OBT | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OBU | Blue Cross Blue Shield of Alabama | 800-760-6852 |
| OBV | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OBW | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| OBX | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OCA | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OCB | Unassigned Prefix | |
| OCC | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OCD | Unassigned Prefix | |
| OCE | Unassigned Prefix | |
| OCF | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| OCG | Unassigned Prefix | |
| OCH | Unassigned Prefix | |
| OCI | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| OCJ | Unassigned Prefix | |
| OCK | Unassigned Prefix | |
| OCL | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OCM | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OCN | Unassigned Prefix | |
| OCO | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OCP | Anthem | |
| OCQ | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| OCR | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| OCS | Blue Cross Blue Shield of Florida | 800-727-2227 |
| OCT | Unassigned Prefix | |
| OCV | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OCW | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OCX | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OCY | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OCZ | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| ODA | Unassigned Prefix | |
| ODB | Anthem | |
| ODC | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ODD | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| ODF | Unassigned Prefix | |
| ODG | Anthem Central Region (OH, IN, KY) | |
| ODH | Unassigned Prefix | |
| ODM | Blue Cross Blue Shield of Arizona | Tucson 800-752-0193 520-745-1883 Phoenix 602-864-4400 800-232-2345 Flagstaff 800-423-6484 928-526-0232 |
| ODN | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| ODO | Unassigned Prefix | |
| ODP | Unassigned Prefix | |
| ODR | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| ODS | Unassigned Prefix | |
| ODU | Empire Blue Cross Blue Shield of New York | 800-552-6630 800-713-4173 - out of area Members 800-343-7283 - Traditional Indemnity |
| ODV | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ODX | Unassigned Prefix | |
| OEC | Excellus Blue Cross Blue Shield of New York | 800-920-8889 800-662-1220 - Blue Option Plus 800-724-1675 - Dental |
| OED | Unassigned Prefix | |
| OEE | Blue Cross Blue Shield of Florida | 800-727-2227 |
| OEF | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OEG | Blue Cross Blue Shield of Kansas | 816-395-3929 816-395-2176 - Prior Authorization 800-320-9550 - Blue Card Claims 800-676-2583 - Eligibility |
| OEH | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OEI | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| OEK | Unassigned Prefix | |
| OEL | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OEM | Unassigned Prefix | |
| OEN | Blue Cross Blue Shield of Alabama | 800-760-6852 |
| OER | Regence Blue Cross Blue Shield of Oregon | 866-227-0913 |
| OES | Unassigned Prefix | |
| OET | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OEU | Unassigned Prefix | |
| OEV | Unassigned Prefix | |
| OEX | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OEZ | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| OFG | Unassigned Prefix | |
| OFL | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OFM | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OFR | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| OFS | Unassigned Prefix | |
| OGA | Unassigned Prefix | |
| OGB | Unassigned Prefix | |
| OGC | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OGD | Unassigned Prefix | |
| OGE | Blue Cross Blue Shield of Oklahoma | 800-496-5774 |
| OGF | Unassigned Prefix | |
| OGG | Carefirst Administrators | 866-945-9839 |
| OGH | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OGI | Unassigned Prefix | |
| OGJ | Unassigned Prefix | |
| OGL | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OGM | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OGO | Unassigned Prefix | |
| OGP | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OGQ | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OGR | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OGS | Blue Cross Blue Shield of Louisiana | 800-495-2583 800-392-4076 - IVR 800-272-3029 - Blue Card |
| OGT | Blue Cross Blue Shield of Western New York | 800-950-0052 800-444-2012 - Blue Card |
| OGU | Unassigned Prefix | |
| OGV | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OGW | Unassigned Prefix | |
| OGX | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OGY | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OGZ | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OHA | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| OHB | Anthem Central Region (OH, IN, KY) | |
| OHC | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OHD | Blue Cross Blue Shield of Texas | 800-451-0287 877-299-2377 - Blue Essentials 877-774-8591 - Blue Cross Medicare Advantage 855-462-1781 - Care Management Programs |
| OHF | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| OHG | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| OHH | Anthem Central Region (OH, IN, KY) | |
| OHK | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OHM | Unassigned Prefix | |
| OHN | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OHP | Anthem Central Region (OH, IN, KY) | |
| OHR | Anthem Blue Cross Blue Shield of Colorado | 877-833-5742 - HMO, Anthem BCBS PPO/Indemnity Plans 800-827-6422 - HMO Guest mebmership or Away from Home Care 866-438-9969 - Medicare Supplement Plans Anthem Associates and Retirees 877-833-5742 800-433-5447 800-234-0111 Anthem Dental 800-231-2583 800-627-0004 888-209-7852 Anthem Vision 800-231-2583 866-723-0515 800-433-5447 - National Par Accounts 888-817-3717 - Blue Card 800-676-2583 - Eligibility |
| OHS | Anthem | |
| OHT | Anthem Central Region (OH, IN, KY) | |
| OHU | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OHV | Unassigned Prefix | |
| OHW | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OIA | Unassigned Prefix | |
| OIB | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OIF | Unassigned Prefix | |
| OIH | Unassigned Prefix | |
| OIL | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OIN | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OJA | Carefirst Administrators | 866-945-9839 |
| OJB | Carefirst Administrators | 866-945-9839 |
| OJC | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OJG | Anthem | |
| OJH | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OJJ | Unassigned Prefix | |
| OJM | Unassigned Prefix | |
| OJO | Unassigned Prefix | |
| OJP | Unassigned Prefix | |
| OJR | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OJS | Carefirst Administrators | 866-945-9839 |
| OJT | Carefirst Administrators | 866-945-9839 |
| OJW | Unassigned Prefix | |
| OJX | Unassigned Prefix | |
| OJZ | Unassigned Prefix | |
| OKB | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OKC | Blue Cross Blue Shield of Oklahoma | 800-496-5774 |
| OKE | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OKL | Unassigned Prefix | |
| OKN | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OKP | Unassigned Prefix | |
| OKU | Unassigned Prefix | |
| OKV | Unassigned Prefix | |
| OKW | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OKY | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OLA | Blue Cross Blue Shield of Kansas | 816-395-3929 816-395-2176 - Prior Authorization 800-320-9550 - Blue Card Claims 800-676-2583 - Eligibility |
| OLB | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OLC | Anthem Central Region (OH, IN, KY) | |
| OLD | Unassigned Prefix | |
| OLE | Anthem Central Region (OH, IN, KY) | |
| OLF | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OLG | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OLK | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| OLL | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OLM | Blue Cross Blue Shield of Arkansas Blue Advantage | 800-827-4814 501-378-2307 800-451-7302 - Pre Certification |
| OLN | Unassigned Prefix | |
| OLS | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OLT | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OLU | Anthem Blue Cross Blue Shield of Colorado | 877-833-5742 - HMO, Anthem BCBS PPO/Indemnity Plans 800-827-6422 - HMO Guest mebmership or Away from Home Care 866-438-9969 - Medicare Supplement Plans Anthem Associates and Retirees 877-833-5742 800-433-5447 800-234-0111 Anthem Dental 800-231-2583 800-627-0004 888-209-7852 Anthem Vision 800-231-2583 866-723-0515 800-433-5447 - National Par Accounts 888-817-3717 - Blue Card 800-676-2583 - Eligibility |
| OLV | Unassigned Prefix | |
| OLZ | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OMB | Anthem | |
| OMC | Anthem Central Region (OH, IN, KY) | |
| OMD | Unassigned Prefix | |
| OME | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OMF | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OMG | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OMJ | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| OMK | Unassigned Prefix | |
| OML | Unassigned Prefix | |
| OMM | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OMN | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OMO | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OMP | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OMQ | Unassigned Prefix | |
| OMR | Unassigned Prefix | |
| OMS | Unassigned Prefix | |
| OMT | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OMU | Blue Cross of Idaho | 866-482-2250 |
| OMV | Unassigned Prefix | |
| OMW | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| OMX | Unassigned Prefix | |
| OMY | Blue Cross Blue Shield of Vermont | 888-222-9206 800-395-3389 - Blue Card |
| ONA | Anthem | |
| ONB | Anthem Central Region (OH, IN, KY) | |
| ONC | Unassigned Prefix | |
| OND | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ONE | Unassigned Prefix | |
| ONF | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| ONG | Blue Cross Blue Shield of Massachusetts | 800-882-2060 - Provider 800-451-8123 - Facility 800-882-1178 - Dental Providers 800-451-8124 - Ancillary Providers |
| ONH | Unassigned Prefix | |
| ONJ | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ONK | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| ONL | Anthem Central Region (OH, IN, KY) | |
| ONM | Unassigned Prefix | |
| ONN | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| ONP | Anthem | |
| ONS | Blue Cross Blue Shield of Alabama | 800-760-6852 |
| ONT | Unassigned Prefix | |
| ONU | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| ONV | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| ONX | Unassigned Prefix | |
| ONY | Unassigned Prefix | |
| ONZ | Unassigned Prefix | |
| OOA | Unassigned Prefix | |
| OOC | Unassigned Prefix | |
| OOM | Unassigned Prefix | |
| OOO | Unassigned Prefix | |
| OOS | Unassigned Prefix | |
| OPA | Blue Cross Blue Shield of Louisiana | 800-495-2583 800-392-4076 - IVR 800-272-3029 - Blue Card |
| OPB | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OPC | Blue Cross Blue Shield of Oklahoma | 800-496-5774 |
| OPD | Unassigned Prefix | |
| OPE | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OPF | Unassigned Prefix | |
| OPG | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OPH | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OPJ | Unassigned Prefix | |
| OPK | Unassigned Prefix | |
| OPM | Unassigned Prefix | |
| OPN | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OPP | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OPQ | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OPR | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OPS | Unassigned Prefix | |
| OPT | Carefirst Administrators | 866-945-9839 |
| OPV | Unassigned Prefix | |
| OPW | Unassigned Prefix | |
| OPX | Unassigned Prefix | |
| OPY | Independence Blue Cross | 800-275-2583 - Key Stone health Plan/Personal choice PPO 215-241-2365 - Key Stone 65 215-561-4877 - Personal Choice 65 888-926-1212 - Medigap |
| OQS | Unassigned Prefix | |
| ORA | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ORB | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| ORC | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| ORE | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| ORF | Unassigned Prefix | |
| ORG | Carefirst Administrators | 866-945-9839 |
| ORH | Unassigned Prefix | |
| ORK | Anthem | |
| ORL | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| ORM | Unassigned Prefix | |
| ORN | Unassigned Prefix | |
| ORP | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| ORR | Unassigned Prefix | |
| ORS | Regence Blue Cross Blue Shield of Washington | 866-227-0913 |
| ORT | Unassigned Prefix | |
| ORU | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| ORW | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| ORX | Blue Cross of Idaho | 866-482-2250 |
| OSA | Unassigned Prefix | |
| OSB | Blue Cross Blue Shield of Alabama | 800-760-6852 |
| OSC | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OSE | Blue Cross Blue Shield of Arizona | Tucson 800-752-0193 520-745-1883 Phoenix 602-864-4400 800-232-2345 Flagstaff 800-423-6484 928-526-0232 |
| OSF | Unassigned Prefix | |
| OSG | Unassigned Prefix | |
| OSH | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OSK | Unassigned Prefix | |
| OSL | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| OSM | Blue Cross Blue Shield of Illinois | 800-972-8088 |
| OSN | Anthem Central Region (OH, IN, KY) | |
| OSO | Unassigned Prefix | |
| OSP | Blue Cross Blue Shield of Florida | 800-727-2227 |
| OSQ | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OSR | Unassigned Prefix | |
| OSS | Unassigned Prefix | |
| OST | Unassigned Prefix | |
| OSU | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OSV | Unassigned Prefix | |
| OSW | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OSX | Unassigned Prefix | |
| OSY | Blue Cross Blue Shield of Kansas | 816-395-3929 816-395-2176 - Prior Authorization 800-320-9550 - Blue Card Claims 800-676-2583 - Eligibility |
| OSZ | Anthem Blue Cross Blue Shield of Virginia | 800-533-1120 855-856-9286 - Anthem Affordable Care Act 800-901-0020 - Anthem Medicare or Medicaid dual eligible program 888-290-9160 - Anthem Medicare Advantage 800-676-2583 - Blue Card |
| OTA | Blue Cross Blue Shield of Florida | 800-727-2227 |
| OTB | Unassigned Prefix | |
| OTC | Blue Cross Blue Shield of Nebraska | 800-635-0579 Option 2 |
| OTD | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OTE | Anthem Central Region (OH, IN, KY) | |
| OTF | Anthem Central Region (OH, IN, KY) | |
| OTG | Blue Cross Blue Shield of Michigan | 800-344-8525 |
| OTH | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| OTI | Unassigned Prefix | |
| OTJ | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OTK | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OTL | Blue Cross Blue Shield of Alabama | 800-760-6852 |
| OTM | Unassigned Prefix | |
| OTN | Unassigned Prefix | |
| OTO | Blue Cross Blue Shield of North Dakota | 800-368-2312 |
| OTQ | Carefirst Administrators | 866-945-9839 |
| OTS | Unassigned Prefix | |
| OTT | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OTU | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OTV | Unassigned Prefix | |
| OTX | Unassigned Prefix | |
| OTY | Unassigned Prefix | |
| OUC | Blue Cross Blue Shield of South Carolina | 800-868-2510 |
| OUG | Unassigned Prefix | |
| OUH | Anthem Central Region (OH, IN, KY) | |
| OUI | Horizon Blue Cross Blue Shield of New Jersey | 800-355-2583 |
| OUN | Unassigned Prefix | |
| OUP | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OUS | Highmark Blue Cross Blue Shield | 800-572-2872 - Delaware 800-294-9568 - Pennsylvania |
| OVA | Unassigned Prefix | |
| OVB | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OVC | Unassigned Prefix | |
| OVE | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OVF | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OVG | Unassigned Prefix | |
| OVH | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OVK | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OVL | Blue Cross Blue Shield of Western New York | 800-950-0052 800-444-2012 - Blue Card |
| OVM | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OVP | Anthem | |
| OVR | Unassigned Prefix | |
| OVS | Anthem Central Region (OH, IN, KY) | |
| OVT | Anthem | |
| OWA | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OWB | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OWC | Regence Blue Cross Blue Shield of Oregon | 866-227-0913 |
| OWD | Carefirst Blue Cross Blue Shield of Maryland | 800-248-8410 |
| OWE | Blue Cross Blue Shield of Florida | 800-727-2227 |
| OWF | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OWH | Unassigned Prefix | |
| OWK | Unassigned Prefix | |
| OWL | Unassigned Prefix | |
| OWM | Anthem Central Region (OH, IN, KY) | |
| OWN | Anthem Central Region (OH, IN, KY) | |
| OWR | Unassigned Prefix | |
| OWS | Unassigned Prefix | |
| OWT | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OWZ | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OXC | Unassigned Prefix | |
| OXE | Unassigned Prefix | |
| OXM | Premera Blue Cross | 800-722-4714 888-261-9562 - Blue Card 800-276-2583 - Eligibility and Benefits |
| OXO | Blue Cross Blue Shield of Western New York | 800-950-0052 800-444-2012 - Blue Card |
| OXP | Anthem Blue Cross of California | 800-677-6669 800-444-2726 - National Accounts 866-700-2168 - Workers Compensation medical provider network Senior Services Medicare Advantage 888-230-7338 - Blue Cross Senior HMO 877-811-3107 - Anthem Medicare PPO 800-333-3883 - Senior Services Medicare supplement 800-645-9785 - Meridian |
| OXS | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OXT | Unassigned Prefix | |
| OXX | Unassigned Prefix | |
| OXY | Unassigned Prefix | |
| OYA | Wellmark Blue Cross Blue Shield | IOWA State 800-524-9242 800-362-2218 - Out of State Claims South Dakota State 800-774-3892 800-774-3892 - Out of State Claims |
| OYC | Horizon Blue Cross Blue Shield of New Jersey | 800-355-2583 |
| OYD | Blue Cross of Idaho | 866-482-2250 |
| OYE | Unassigned Prefix | |
| OYL | Blue Shield of California | 800-541-6652 800-622-0632 - Blue Card out of area 800-241-4896 - Blue Shield of California NASCO |
| OYM | Unassigned Prefix | |
| OYP | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OYZ | Blue Cross Blue Shield of Tennessee | 800-924-7141 800-468-9736 - Blue Care 800-276-1978 - TennCare Select |
| OZA | Unassigned Prefix | |
| OZC | Horizon Blue Cross Blue Shield of New Jersey | 800-355-2583 |
| OZH | Unassigned Prefix | |
| OZL | Unassigned Prefix | |
| OZM | Unassigned Prefix | |
| OZN | Unassigned Prefix | |
| OZS | Unassigned Prefix | |
| OZW | Blue Cross Blue Shield of Georgia | 855-295-5840 800-676-2583 - Blue Card Eligibility 800-282-2473 - Facility Claims 800-535-8291 -Guest Membership or HMO Away from Home Care |
| OZZ | Unassigned Prefix |