One Care Ombudsman
Commonwealth Care Alliance

The One Care Ombudsman


The One Care Ombudsman is an independent program that helps you address concerns or conflicts that may interfere with enrollment in One Care or access to One Care benefits and services.

The One Care Ombudsman works with MassHealth and each One Care plan to help members. The One Care Ombudsman can:

✓ Provide information and resources
✓ Identify your options
✓ Investigate the problem
✓ Work to resolve your concerns

How to Contact the One Care Ombudsman

Call: 855-781-9898 (TTY 711)

11 Dartmouth Street
Suite 301
Malden, MA 02148

9:00 am – 4:00 pm, Monday – Friday
No appointment necessary: 1:00 pm – 4:00 pm, Monday and 9:00 am – 12:00 pm, Thursday


Visit the Ombudsman website

Call 855-781-9898 (TTY 711) to:

  • Ask for information in an alternate format or in Spanish
  • Arrange interpreters for the deaf or non-English speaking individuals One Care Ombudsman offices are wheelchair accessible.

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

On this page