| Aetna | | | CMS plans |
| AgeWell New York | | | CMS Plans |
| AIDS Healthcare Foundation (AHF) | | | CMS plans |
| AllCare Health | | | CMS Plans |
| Alliant Health Plans | | | CMS Plans |
| AllWays Health Partners | | | CMS plans |
| Aloha Care | | | CMS Plans |
| American Health Advantage of Mississippi | | | CMS Plans |
| American Health Advantage of Tennessee | | | CMS Plans |
| American Health Advantage of Texas | | | CMS Plans |
| AmeriHealth Caritas Family of Companies | | | CMS plans |
| Anthem | | | All plans |
| Arkansas Blue Cross and Blue Shield | | | CMS plans |
| Aspire Health Plan | | | CMS Plans |
| Aspirus Health Plan | | | CMS Plans |
| Asuris Northwest Health | | | CMS Plans |
| ATRIO Health Plans | | | CMS Plans |
| AultCare Insurance Company | | | CMS plans, FEHB |
| AvMed | | | CMS Plans |
| BayCare Health Plans | | | CMS Plans |
| Blue Cross & Blue Shield of Rhode Island | | | CMS plans |
| Blue Cross and Blue Shield of Alabama | | | CMS plans |
| Blue Cross and Blue Shield of Illinois | | | CMS plans |
| Blue Cross and Blue Shield of Kansas | | | CMS plans |
| Blue Cross and Blue Shield of Kansas City | | | CMS Plans |
| Blue Cross and Blue Shield of Minnesota | | | CMS plans |
| Blue Cross and Blue Shield of Montana | | | CMS Plans |
| Blue Cross and Blue Shield of Nebraska | | | CMS Plans |
| Blue Cross and Blue Shield of New Mexico | | | CMS Plans |
| Blue Cross and Blue Shield of North Carolina | | | CMS plans |
| Blue Cross and Blue Shield of Oklahoma | | | CMS Plans |
| Blue Cross and Blue Shield of Texas | | | CMS Plans |
| Blue Cross and Blue Shield of Wyoming | | | CMS Plans |
| Blue Cross Blue Shield of Massachusetts | | | CMS plans |
| Blue Cross Blue Shield of Michigan | | | CMS plans |
| Blue Cross Blue Shield of North Dakota | | | CMS plans |
| BlueCross BlueShield of Tennessee | | | CMS plans |
| BridgeSpan Health Company | | | CMS Plans |
| Bright Health | | | CMS plans |
| Capital BlueCross | | | CMS plans |
| Capital District Physicians' Health Plan (CDPHP) | | | All plans |
| Care N' Care Health Plan | | | CMS plans |
| CareFirst BlueCross BlueShield | | | CMS plans |
| CareOregon | | | CMS Plans |
| CareSource | | | CMS plans |
| Centene Corporation | | | CMS plans |
| Center for Medicare & Medicaid Services (CMS) | | | CMS plans |
| Centers Plan for Healthy Living (CPHL) | | | CMS plans |
| Children's Community Health Plan | | | CMS Plans |
| CHRISTUS Health Plan | | | CMS Plans |
| Cigna Corporation | | | All plans |
| Clear Spring Health | | | CMS Plans |
| Clover Health | | | CMS plans |
| Colorado Access | | | CMS Plans |
| Common Ground Healthcare Cooperative | | | CMS Plans |
| Commonwealth Care Alliance | | | CMS Plans |
| Community Care Health Plan, Inc. | | | CMS Plans |
| Community Health Group | | | CMS plans |
| Community Health Network of Washington | | | CMS plans |
| CommunityCare | | | CMS plans |
| CountyCare Health Plan | | | CMS plans |
| Cox HealthPlans | | | CMS Plans |
| Dean Health Plan | | | CMS plans |
| Dell Children's Health Plan | | | CMS Plans |
| Denver Health Medical Plan | | | CMS Plans |
| Devoted Health | | | CMS plans |
| Doctors HealthCare Plans | | | CMS Plans |
| El Paso First Health Plans | | | CMS Plans |
| EmblemHealth | | | CMS plans |
| Empower Health | | | CMS plans |
| Essence Healthcare | | | CMS Plans |
| Excellus BlueCross BlueShield | | | CMS plans |
| Fallon Health | | | CMS plans |
| First Medical Health Plan | | | CMS plans |
| Florida Blue | | | CMS plans |
| Florida Complete Care | | | CMS Plans |
| Friday Health Plans | | | CMS Plans |
| Geisinger Health Plan | | | CMS Plans |
| Georgia Health Advantage | | | CMS Plans |
| GlobalHealth | | | CMS plans |
| Golden State Medicare Health Plan | | | CMS Plans |
| Group Health Cooperative of Eau Claire | | | CMS plans |
| Group Health Cooperative of South Central Wisconsin | | | CMS plans |
| Hamaspik Medicare Select | | | CMS plans |
| Hawaii Medical Service Association | | | CMS Plans |
| Health Alliance Plan | | | CMS plans |
| Health First Health Plans | | | CMS plans |
| Health Partners Plans | | | CMS Plans |
| Health Plan of San Mateo | | | CMS plans |
| Healthfirst | | | All plans |
| HealthPartners | | | CMS plans |
| Highmark Health | | | CMS plans |
| Hometown Health Plan | | | CMS Plans |
| Horizon Blue Cross Blue Shield of New Jersey | | | CMS plans |
| Humana | | | CMS plans |
| Inclusa | | | CMS plans |
| Independence Blue Cross | | | CMS plans |
| Independent Care Health Plan | | | CMS Plans |
| Indiana University Health Plans | | | CMS Plans |
| Johns Hopkins Advantage MD | | | CMS Plans |
| Kaiser Foundation Health Plan of Colorado | | | All Plans |
| Kaiser Foundation Health Plan of Georgia | | | All Plans |
| Kaiser Foundation Health Plan of Hawaii | | | All Plans |
| Kaiser Foundation Health Plan of the Mid-Atlantic States | | | All Plans |
| Kaiser Foundation Health Plan of the Northwest | | | All Plans |
| Kaiser Foundation Health Plan of Washington | | | All Plans |
| Kaiser Permanente | | | All plans |
| L.A. Care Health Plan | | | CMS Plans |
| LEON Health | | | CMS Plans |
| Mary Washington Medicare Advantage | | | CMS Plans |
| Maryland Physicians Care | | | CMS plans |
| McLaren Health Plan | | | CMS Plans |
| McLaren MDwise | | | CMS Plans |
| Medical Card System Puerto Rico | | | CMS plans |
| Medical Mutual of Ohio | | | CMS plans |
| MedStar Family Choice | | | CMS Plans |
| Mercy Care Plan | | | CMS Plans |
| Missouri Medicare Select | | | CMS Plans |
| MO HealthNet | | | CMS Plans |
| Moda Health | | | CMS plans |
| MoreCare | | | CMS Plans |
| MVP Health Care | | | CMS Plans |
| My Choice Wisconsin Health Plan | | | CMS Plans |
| Neighborhood Health Plan of Rhode Island | | | CMS Plans |
| Network Health | | | CMS plans |
| New Jersey Health Information Network (NJHIN) | | | CMS plans |
| Oscar Health | | | CMS plans |
| Paramount Insurance Company | | | CMS plans |
| Partners Health Management | | | CMS plans |
| Partnership HealthPlan of California | | | CMS Plans |
| Physicians Health Plan | | | CMS plans |
| Point32Health | | | CMS plans |
| Premera Blue Cross | | | CMS plans |
| PrimeWest | | | CMS plans |
| Priority Health | | | CMS plans |
| Priority Partners | | | CMS Plans |
| Providence Health Plan | | | CMS plans |
| Quartz Health Solutions | | | CMS plans |
| Regence Blue Shield | | | CMS Plans |
| Regence BlueCross BlueShield of Oregon | | | CMS plans |
| Regence BlueCross BlueShield of Utah | | | CMS Plans |
| Regence BlueShield of Idaho | | | CMS Plans |
| Reliance Medicare Advantage | | | CMS Plans |
| RiverSpring Health | | | CMS plans |
| Samaritan Health Plans | | | CMS Plans |
| San Francisco Health Plan (SFHP) | | | CMS Plans |
| Sanford Health Group | | | CMS plans |
| SCAN Health Plan | | | CMS plans |
| SelectHealth | | | CMS plans |
| Sendero Health | | | CMS plans |
| Sharp Health Plan | | | CMS plans |
| South Country Health Alliance | | | CMS plans |
| Southeastern Indiana Health Organization | | | CMS plans |
| Stanford Health Care Advantage | | | CMS Plans |
| State of Alaska | | | CMS plans |
| State of Arkansas | | | CMS plans |
| State of Connecticut | | | CMS plans |
| State of Delaware | | | CMS plans |
| State of Georgia | | | CMS plans |
| State of Kansas | | | CMS plans |
| State of Kentucky | | | CMS plans |
| State of Louisiana | | | CMS plans |
| State of Maine | | | CMS plans |
| State of Maryland | | | CMS plans |
| State of Massachusetts | | | CMS Plans |
| State of Michigan | | | CMS plans |
| State of Nevada | | | CMS plans |
| State of New Jersey | | | CMS Plans |
| State of Rhode Island | | | CMS plans |
| State of Vermont | | | CMS plans |
| State of West Virginia | | | CMS plans |
| State of Wisconsin | | | CMS plans |
| SummaCare | | | CMS Plans |
| Texas Children's Health Plan | | | CMS Plans |
| Texas Independence Health Plan | | | CMS Plans |
| The Health Plan | | | CMS Plans |
| UCare | | | CMS Plans |
| UnitedHealthcare | | | CMS plans |
| Univera Healthcare | | | CMS Plans |
| UPMC Health | | | All plans |
| Upper Peninsula Health Plan | | | CMS Plans |
| Vaya Health | | | CMS plans |
| Vitality Health Plan of California | | | CMS Plans |
| Viva Health | | | CMS Plans |
| Vivida Health Plan | | | CMS Plans |
| VNS Health Health Plans | | | CMS plans |
| WellCare Health Plans | | | CMS Plans |
| Wellmark Blue Cross and Blue Shield of Iowa | | | CMS plans |
| Wellmark Blue Cross and Blue Shield of South Dakota | | | CMS Plans |
| WellSense Health Plan | | | CMS plans |
| Western Health Advantage | | | CMS plans |
| Yamhill Community Care Organization | | | CMS Plans |
| Zing Health | | | CMS plans |