- National Applications: AAHP, Aperture App-One (Aetna, First Option Health Plan a/k/a Physician Health Services, Health Plus, Inc., HIP Health Plans, Humana, NYLCare, Oxford, PCA Family Health Plans of Puerto Rico, United HealthCare), Cigna, HCFA, One Health Plan
- Alabama: Alabama Standard application, CACH, DirectCare, First Community Health Plan, Health Advantage, Health Partners of Alabama, Merit HealthPlan of Alabama, Preferred Health Alliance, Primehealth of Alabama, Principal Health, Southern Health Systems, Viva Health, National Applications
- Alaska: No contact to date
- Arizona: Most insurers are national
- Arkansas: Blue Cross Health Advantage, HMO Arkansas, National Applications
- California: California Participating Physician Application, CaliforniaCare Health Plan (WellPoint Health Network) Blue Cross of California, Care First Health Plan, Community Health Group, Contra Costa Health Plan, Health Net, Health Plan of the Redwoods, Kaiser Permanente, Kern Health Systems, Lifeguard, Inc., Sharp Health Plan, Universal Care, PacifiCare of California, Inter valley Health Plan, Maxicare, National Applications
- Colorado: National Applications
- Connecticut: Most insurers are national
- Delaware: Amerihealth HMO, duPont Hospital, National Applications
- District of Columbia: Capital Care, Inc. Blue Cross Blue Shield, Kaiser Foundation Health Plan of the Midatlantic States, George Washington University Health Plan, National Applications
- Florida: Mandated that all insurers use CoreSTAT (Payers, Hospitals and malpractice)
- Georgia: John Deere Health Plan of Georgia, National Applications
- Hawaii: No contact to date, National Applications
- Idaho: National Applications
- Illinois: State Mandated standard credentialing application (must be accepted by every hospital and insurance company in the state)
- Indiana: Anthem BCBS, Maxicare, National Applications
- Iowa: National Applications
- Kansas: State Mandated standard credentialing application (must be accepted by every insurance company in the state)
- Kentucky: Anthem BCBS, C H A Health, PacifiCare (Ohio Standard), National Applications
- Louisiana: Louisiana Standard Application, Coventry (Principal) Health Care of Louisiana, Louisiana Blue, Ochsner Health Plan, SMA Health Plans, Ventura Health Partnership Group, National Applications
- Maine: Maine standard credentialing application, Blue Cross Blue Shield of Maine, HMO Maine, National Applications
- Maryland: CapitalCare Blue Cross Blue Shield, George Washington University Health Plan, Kaiser Foundation of the Midatlantic States, Preferred Health Network, National Applications
- Massachusetts: National Applications
- Michigan: Michigan Association of Health Plans Standard Application, Blue Care Network of Michigan, Cape Health Plan, Community Choice Michigan, Family Health Plan, Inc., Grand Valley Health Plan, Great Lakes Health Plan, Health Alliance Plan/Michigan, Health Plus/Michigan, M-Care, Omnicare Health Plan, Physicians Health Plan, Priority Health, Select Care HMO, The Wellness Plan, National Applications
- Minnesota: Allina Health Systems, Blue Cross Blue Shield of Minnesota, Central Minnesota Health Plan, Duluth Clinic/St. Mary's Hospital, Fairview Health Systems, Health System Minnesota, HealthPartners, MAYO Clinic, Mayo Health Plan and Mayo Management Services, Medica Health Plan, Medical Credentialing Services of Minnesota and it's Contracting Organizations, Metropolitan Health Plan, Minnesota Rural Health Care Cooperative, Preferred One and Preferred One Community Health Plan, Quality Health Alliance, The Araz Group, U Care Minnesota, National Applications
- Mississippi: National Applications
- Missouri: Missouri State Standard Application (must be accepted by every insurance company in the state)
- Montana: National Applications
- Nebraska: National Applications
- Nevada: North Nevada Standard Application, The Center for Outpatient Surgery, ELKO General Hospital, Hometown Health Plan, St. Mary's HealthFirst, St. Mary's Health Network, Northern Nevada Medical Center, Select Specialty Hospitals - Reno, Washoe Health System, Tahoe Pacific Hospital, National Applications
- New Hampshire: National Applications
- New Jersey: AmeriHealth, Health Care Payers Coalition, Horizon Blue Cross Blue Shield of New Jersey, MasterCare, One Call Medical, Inc., QualMed, National Applications
- New Mexico: New Mexico Standard Application, Acoma Canancito Laguna Hospital, Cimarron Health Plan, Columbia Medical Center of Carlsbad, DeBaca General Hospital, First Choice Community Health Care, Gila Regional Medical Center, Guadalupe County Hospital, Holy Cross Hospital, Hospital Care Specialists, Los Alamos Medical Center, Mesilla Valley Hospital, Mimbres Memorial Hospital, Miners' /Colfax Medical Center, Heart Hospital of New Mexico, New Mexico Heart Institute, P.A., Northeastern Regional Hospital, Plains Regional Medical Center, Presbyterian Healthcare Services, Presbyterian Health Plan, Rehoboth-McKinley Christian Hospital, San Juan Regional Medical Center, Sierra Vista Hospital, Socorro General Hospital, St. Joseph Healthcare System, St. Vincent Hospital, Trigg Memorial Hospital, Union County Hospital, UNM Health Sciences Center, National Applications
- New York: Blue Cross of Western New York, Community Blue, Healthcare Plan a/k/a Univera Healthcare, Independent Healthcare Association, Inc., National Applications
- North Carolina: North Carolina Standard Application, Blue Cross Blue Shield of North Carolina - Personal Care Plan, Coventry HealthCare of the Carolinas, Doctors Health Plan, Generations Family Health Plan, MAMSI, Optimum Choice, Partners Health Plan of North Carolina, Qual Choice of North Carolina, The Wellness Plan of North Carolina, WellPath Community Health Plans, National Applications
- North Dakota: National Applications
- Ohio: State Mandated standard credentialing application (must be accepted by every hospital and insurance company in the state)
- Oklahoma: State Mandated standard credentialing application (must be accepted by every hospital and insurance company in the state)
- Oregon: State Mandated standard credentialing application (must be accepted by every hospital and insurance company in the state)
- Pennsylvania: Pennsylvania Standard Application, AmeriHealth, *Commerce & Industry Insurance Company, Application for Professional Liability Insurance First Priority Health, Health Central, Health Guard, HealthAmerica PA, HealthCare Management Alternatives, Highmark Blue Cross Blue Shield of Western Pennsylvania, HIP Health Plan of PA, Keystone HealthPlan East, Keystone Blue, Keystone Health Plan Central, Keystone Mercy, MPO/CCPO, Pennsylvania Blue Shield, Pennsylvania Medical Society Instant Membership, Pennsylvania Medical Society Liability Insurance, QualMed HealthCare, *Zurich - American Insurance Group, Individual Physicians Application, National Applications
- Puerto Rico:
- Rhode Island: National Applications
- South Carolina: South Carolina Standard Application, Blue Cross Blue Shield of South Carolina, Companion HealthCare Corp, Doctors Health Plan (N. Carolina Standard), John Deere Health Plan, Optimum Choice of the Carolinas, Partners National Health Plan, Physicians HealthCare of the Carolinas, National Applications
- South Dakota: National Applications
- Tennessee: National Applications
- Texas: Dallas/Ft. Worth Standard Application, Blue Cross Blue Shield of Texas, PacifiCare, Texas Health Choice, National Applications
- Utah: National Applications
- Vermont: National Applications
- Virginia: Blue Cross Blue Shield, CapitalCare, Inc., George Washington University Health Plan, Kaiser Foundation Health Plan of the Mid-Atlantic States, National Applications
- Washington: Washington State Standard Application, First Choice Health Network, Group Health Cooperative of Puget Sound, Group Health Northwest, Regence BlueShield, National Applications
- West Virginia: National Applications
- Wisconsin: Atrium, Blue Cross Blue Shield of Wisconsin, National Applications
- Wyoming: National Applications
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