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Enroll Directly With MassHealth

Before you call MassHealth, be sure to download and complete the One Care Enrollment Decision Form.* Filling it out in advance will speed up your enrollment.

Call MassHealth Customer Service Center at:

800-841-2900 (TTY: 800-497-4648)

They are open Monday through Friday, 8 am – 5 pm.

Or Enroll Online

Or you can enroll online. To enroll with CCA via the MassHealth website, be sure to select Commonwealth Care Alliance from the plan dropdown.

Need more help?

Do you have additional questions? We’d be happy to walk you through the process. You can call us or request a call.

Call CCA at 866-610-2273 (TTY 711)

8 am – 8 pm, 7 days a week

Ask us to call you:

To request a call, please fill out this form:

*When you click this link, you will leave the Commonwealth Care Alliance website.

At no point will Commonwealth Care Alliance sell, trade, or lease any information collected on our site. The information provided will be used to contact you, provide you with information, or help you enroll. CommonHealth members may pay a premium to MassHealth. The premium amount is determined by the member’s family income. Members must continue to pay this premium after they enroll in One Care. The payment is made directly to MassHealth. If members have questions regarding their premium or would like to set up a payment plan or apply for a hardship waiver, they should contact MassHealth at 800-841-2900 (TTY 800-497-4648).

Medicare beneficiaries may also enroll in One Care through the CMS Medicare Online Enrollment Center, located at

Contact MassHealth to Enroll in CCA One Care

800-841-2900 (TTY 800-497-4648)
8:00 am to 5:00 pm, Monday through Friday

Questions About Enrollment?

We can walk you through the process, step by step.

Call us at 866-610-2273 (TTY 711) 8:00 am to 8:00 pm, Monday through Friday, and 8:00 am to 6:00 pm, Saturday and Sunday