A-B
- AARP
- AETNA HMO
- AETNA PPO
- ALLIANCE PPO
- ALLIED BENEFIT SYSTEM
- AMERIGROUP MD
- AMERIHEALTH
- ANTHEM
- BANKERS LIFE AND CASUALTY
- BLUE CROSS BLUE SHIELD – MD
- BLUE CROSS BLUE SHIELD – DC
- BLUE CROSS BLUE SHIELD – FEDERAL EMPLOYEE
- PROGRAM
- CAREFIRST BLUE CHOICE
- CAREFIRST ADMINISTRATORS
- CAREFIRST BLUE CROSS BLUE SHIELD
- CAREFIRST MEDICARE ADVANTAGE
- CHAMPUS
- CIGNA HMO
- CIGNA POS
- CIGNA PPO
- CIGNA HEALTHSPRINGS
- COLONIAL PENN LIFE
- COVENTRY PPO
F-Z
- FREEDOM LIFE
- GEHA
- HUMANA
- JOHN HOPKINS HEALTH CARE
- KAISER PERMANENTE
- MARYLAND PHYSICIANS CARE
- MEDICAID MARYLAND
- MDIPA
- MEDICARE
- MEDSTAR
- MUTUAL OF OMAHA
- NALC HEALTH SYSTEM
- NCAS INSURANCE COMPANY
- OPTIMUM CHOICE
- PRIORITY PARTNERS
- PRIVATE HEALTHCARE SYSTEM (PHCS)
- RAILROAD MEDICARE
- TRICARE FOR LIFE
- TEAMSTERS
- UNITED HELAHTCARE
- UNITED HEALTHCARE INTEGRATED SERVICES
- UNITED HEALTHCARE OF THE MID-ATLANTIC
- USAA
- WEBTPA
- WELLNET
