| Aetna | | CMS plans |
| AIDS Healthcare Foundation (AHF) | | CMS plans |
| Alignment Health Plan | | CMS Plans |
| AllCare Health | | 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 |
| Asuris Northwest Health | | CMS Plans |
| ATRIO Health Plans | | CMS Plans |
| AultCare Insurance Company | | CMS plans, FEHB |
| AvMed | | CMS Plans |
| Banner University Health Plans | | CMS Plans |
| Blue Choice of South Carolina | | CMS Plans |
| Blue Cross & Blue Shield of Rhode Island | | CMS plans |
| Blue Cross Blue Shield of Alabama | | CMS plans |
| Blue Cross Blue Shield of Illinois | | CMS plans |
| Blue Cross Blue Shield of Kansas | | CMS plans |
| Blue Cross Blue Shield of Kansas City | | CMS Plans |
| Blue Cross Blue Shield of Massachusetts | | CMS plans |
| Blue Cross Blue Shield of Michigan | | CMS plans |
| Blue Cross Blue Shield of Minnesota | | CMS plans |
| Blue Cross Blue Shield of Montana | | CMS Plans |
| Blue Cross Blue Shield of Nebraska | | CMS Plans |
| Blue Cross Blue Shield of New Mexico | | CMS Plans |
| Blue Cross Blue Shield of North Carolina | | CMS plans |
| Blue Cross Blue Shield of North Dakota | | CMS plans |
| Blue Cross Blue Shield of Oklahoma | | CMS Plans |
| Blue Cross Blue Shield of Texas | | CMS Plans |
| Blue Cross Blue Shield of Wyoming | | CMS Plans |
| Blue Shield of California | | CMS plans |
| BlueCross BlueShield of Tennessee | | CMS plans |
| BridgeSpan Health Company | | CMS Plans |
| Bright Health | | CMS plans |
| CalOptima | | 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 |
| Cascade Health Alliance | | CMS Plans |
| CenCal Health | | CMS Plans |
| Centene Corporation | | CMS plans |
| Centers for Medicare & Medicaid Services (CMS) | | CMS plans |
| Centers Plan for Healthy Living (CPHL) | | CMS plans |
| Central California Alliance for Health | | CMS Plans |
| Central Health Plan of California | | CMS Plans |
| Chinese Community Health Plan | | CMS Plans |
| Chorus Community Health Plan | | CMS Plans |
| Cigna Corporation | | CMS plans |
| Clover Health | | CMS plans |
| Colorado Access | | CMS Plans |
| Commonwealth Care Alliance | | CMS Plans |
| Community Care Plan | | CMS Plans |
| Community Health Group | | CMS plans |
| Community Health Network of Washington | | CMS plans |
| CommunityCare | | CMS plans |
| Contra Costa Health Plan | | CMS Plans |
| CountyCare Health Plan | | CMS plans |
| Dean Health Plan | | CMS plans |
| Dell Children's Health Plan | | CMS Plans |
| Denver Health Medical Plan | | CMS Plans |
| Devoted Health | | CMS plans |
| Driscoll Health Plan | | CMS Plans |
| EmblemHealth | | CMS plans |
| Empower Health | | CMS plans |
| Excellus BlueCross BlueShield | | CMS plans |
| Fallon Health | | CMS plans |
| First Medical Health Plan | | CMS plans |
| Florida Blue | | CMS plans |
| Florida Community Care Health Plan | | |
| Florida Health Care Plan | | CMS Plans |
| Geisinger Health Plan | | CMS Plans |
| Georgia Health Advantage | | 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 Joaquin | | CMS Plans |
| Health Plan of San Mateo | | CMS plans |
| Healthfirst | | All plans |
| Hennepin Health | | 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 |
| Inland Empire Health Plan | | CMS Plans |
| ITASCA Medical Care | | 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 |
| Liberty Dental Plan | | |
| Maryland Physicians Care | | CMS plans |
| Mass Advantage | | CMS Plans |
| Mass General Brigham Health Plan | | CMS plans |
| McLaren Health Plan | | CMS Plans |
| McLaren MDwise | | CMS Plans |
| Medica | | CMS Plans |
| Medical Card System | | CMS plans |
| Medical Mutual of Ohio | | CMS plans |
| MedStar Family Choice | | CMS Plans |
| Mercy Care Plan | | CMS Plans |
| MercyCare Health Plans | | CMS Plans |
| Missouri Medicare Select | | CMS Plans |
| MO HealthNet | | CMS Plans |
| Moda Health | | CMS plans |
| MoreCare | | CMS Plans |
| MVP Health Care | | 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 |
| Provider Partners 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 |
| San Francisco Health Plan (SFHP) | | CMS Plans |
| Sanford Health Group | | CMS plans |
| SCAN Health Plan | | CMS plans |
| Security Health Plan of Wisconsin | | CMS Plans |
| SelectHealth | | CMS plans |
| Sendero Health | | CMS plans |
| Sentara Health Plans | | CMS Plans |
| Sharp Health Plan | | CMS plans |
| Signature Advantage | | |
| South Country Health Alliance | | CMS plans |
| Southeastern Indiana Health Organization | | 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 Idaho | | CMS plans |
| State of Iowa | | 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 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 Washington | | CMS Plans |
| State of West Virginia | | CMS plans |
| State of Wisconsin | | CMS plans |
| Steward Health Choice | | CMS Plans |
| SummaCare | | CMS Plans |
| Texas Independence Health Plan | | CMS Plans |
| The Health Plan | | CMS Plans |
| Triple-S | | CMS Plans |
| Umpqua Health Alliance | | CMS Plans |
| UnitedHealthcare | | CMS plans |
| Univera Healthcare | | CMS Plans |
| University of Utah Health Plans | | CMS Plans |
| UPMC Health | | All plans |
| Upper Peninsula Health Plan | | CMS Plans |
| Vaya Health | | CMS plans |
| VillageCareMAX | | CMS plans |
| Virginia Premier Health Plan | | CMS Plans |
| Vitality Health Plan of California | | 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 |
| Zing Health | | CMS plans |