Medicaid plans › Massachusetts
Massachusetts Medicaid Managed-Care Plans for Providers
Enrollments are billed 50% at the start and 50% at submission; everything else 100% at the start.
MassHealth is run by the Massachusetts Executive Office of Health and Human Services. 903,795 people were enrolled in its 9 managed-care plans in 2024. To see their patients, a provider enrolls with MassHealth through the MassHealth Provider Online Service Center (POSC), then applies to each plan separately.
| Plan | Members (2024) | Share | Parent |
|---|---|---|---|
| WellSense Health Plan | 461,000 | 51% | Boston Medical Center Health Plan |
| Mass General Brigham Health Plan | 132,115 | 14.6% | In-state |
| Tufts Health Together | 118,899 | 13.2% | Point32Health |
| Fallon Health | 83,892 | 9.3% | In-state |
| BeHealthy Partnership Plan | 45,272 | 5% | In-state |
| UnitedHealthcare | 23,589 | 2.6% | UnitedHealth Group |
| Commonwealth Care Alliance | 16,523 | 1.8% | In-state |
| Senior Whole Health | 12,464 | 1.4% | Molina Healthcare |
| Navicare HMO | 10,041 | 1.1% | In-state |
How Joining Works in Massachusetts
First the state: MassHealth enrollment through the MassHealth Provider Online Service Center (POSC), which gives you the Medicaid ID every plan asks for. Then the plans: each takes its own participation request and credentials you from your CAQH ProView (DataSpring) profile. 4 parent companies run plans here, and plans owned by the same company still contract state by state.
How to Join Each Massachusetts Plan
UnitedHealthcare (UnitedHealth Group): UnitedHealthcare Community Plans use UnitedHealthcare's provider onboarding: a participation request on the UnitedHealthcare provider site, credentialing from your CAQH ProView (DataSpring) profile, then a state-specific Community Plan agreement.
Senior Whole Health (Molina Healthcare): Molina credentials each state separately. The contract request goes through the state's Molina provider site and requires an active state Medicaid enrollment; credentialing uses your CAQH ProView (DataSpring) profile.
WellSense Health Plan, Mass General Brigham Health Plan, Tufts Health Together, Fallon Health, BeHealthy Partnership Plan, Commonwealth Care Alliance, Navicare HMO: This plan is run in-state rather than by a national carrier, so participation requests go to the plan's own provider relations or contracting team, listed on its provider website.
Also in Massachusetts: Medicare, MassHealth and commercial credentialing.
Questions
Which Massachusetts Medicaid plan is the largest?
WellSense Health Plan, with 461,000 members in 2024, 51% of the 903,795 people enrolled in Massachusetts's Medicaid managed-care plans.
Do I have to join every Massachusetts Medicaid plan?
No. Each plan is a separate contract. Practices usually start with the two or three largest plans in their county, then add others as patients ask for them. All of them require MassHealth enrollment first.
Membership from KFF, Medicaid MCO Enrollment by Plan and Parent Firm, 2024. Plans change when the state rebids its contracts; we confirm the current list on every file.