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  • MassHealth

One Care Plans

There are three One Care plans. Click on the individual plan links to learn more about each one.

Before you begin looking at the plans, each plans serve particular counties. To find out what your county is, go to City-to-County Finder: StatsAmerica.

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Commonwealth Care Alliance

Commonwealth Care Alliance One Care health card and logo

Customer Service: Monday through Friday 8:00am to 8:00pm, Saturday and Sunday 8:00am to 6:00pm 
Phone: (866) 610-2273,TDD/TTY: 711

Commonwealth Care Alliance is in the following counties: Barnstable, Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk and Worcester.

Tufts Health One Care

Tufts Health Unify health card and logo

Customer Service: 7 days a week, from 8:00am to 8:00pm
Phone: (855) 393-3154, TDD/TTY: 711

Tufts Health One Care is in the following counties: Barnstable, Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and Worcester.

UnitedHealthcare Connected

UnitedHealthcare Logo and health card

Customer Service: 7 days a week, from 8:00am to 8:00pm
Phone: 1-866-633-4454, TDD/TTY: 711

United Healthcare is in the following counties: Bristol, Essex (Partial), Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk and Worcester.

Contact

Phone

Main: Call MassHealth Customer Service Center, Main: at (800) 841-2900
TDD/TTY: Call MassHealth Customer Service Center, TDD/TTY: at 711

Self-service available 24 hrs/day in English and Spanish. Other services available Monday-Friday 8 a.m.–5 p.m. Interpreter services are available.

Date published: May 24, 2023
Last updated: April 16, 2025

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