We’re here to help
Our team can answer questions about plans, benefits, or eligibility.
SCO and One Care questions
Call now
Our sales team can answer questions about our SCO and One Care plans. We’ll talk through the plan benefits and help you enroll over the phone if you’re ready.
Call 888-403-7573 (TTY: 711)
October 1 - March 31
8 a.m. to 8 p.m. ET, Monday-Sunday
April 1 - September 30
8 a.m. to 8 p.m. ET, Monday-Friday
Medicare Advantage questions
Call now
Contact one of our expert Medicare Advisors for any questions about our Medicare Advantage plans. We’ll talk you through your options to help you find the right plan, and help you enroll over the phone if you’re ready.
Call 855-486-3097 (TTY 711)
October 1 - March 31
8 a.m. to 8 p.m. ET, Monday-Sunday
April 1 - September 30
8 a.m. to 8 p.m. ET, Monday-Friday
If you are a Mass General Brigham Health Plan member with an active plan, you can contact our member services team for any questions about your plan or benefits.
Medicare Advantage Customer Service
Email: HealthPlanMedAdvCustomerService@mgb.org
Call: 855-833-3668 (TTY 711)
October 1 - March 31
8 a.m. to 8 p.m. ET, Monday-Sunday
April 1 - September 30
8 a.m. to 8 p.m. ET, Monday-Friday
SCO and One Care Member Services
Email: HealthPlanDualsCustomerService@mgb.org
Call: 888-816-6000 (TTY 711)
October 1 - March 31
8 a.m. to 8 p.m. ET, Monday-Sunday
April 1 - September 30
8 a.m. to 8 p.m. ET, Monday-Friday
To submit paper forms or contact us via mail, you can address letters to the Mass General Brigham Health Plan mailing address for your plan.
For Medicare Advantage members
Mass General Brigham Health Plan
Medicare Advantage
399 Revolution Drive, Suite 850
Somerville, MA 02145
For SCO and One Care members
Mass General Brigham Health Plan
399 Revolution Drive, Suite 875
Somerville, MA 02145
© 2025 Mass General Brigham Health Plan, Inc.
Mass General Brigham Health Plan is an HMO-POS/PPO organization with a Medicare contract. Enrollment in Mass General Brigham Health Plan depends on contract renewal. Other providers/pharmacies are included in our network.
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Mass General Brigham One Care is a Dual Special Needs Plan (D-SNP) that contracts with both Medicare and MassHealth (Medicaid) to provide benefits of both programs to enrollees. Enrollment in the plan depends on the plan’s contract renewal with Medicare. This plan is a voluntary program that is available to anyone age 21 - 64 who qualifies for MassHealth Standard or CommonHealth and Original Medicare and does not have any other comprehensive health insurance, except Medicare.
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Mass General Brigham SCO (Senior Care Options) is a Dual Special Needs Plan (D-SNP) with a Medicare contract and a contract with the Commonwealth of Massachusetts Medicaid program. Enrollment in the plan depends on the plan’s contract renewal with Medicare. This plan is a voluntary program that is available to anyone 65 and older who qualifies for MassHealth Standard and Original Medicare and does not have any other comprehensive health insurance, except Medicare.
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Last updated: 10/1/2025