About us

MIIA Addresses:

Main Address, Telephone, & Fax Numbers:

Massachusetts Interlocal Insurance Association

One Winthrop Square, 2nd Floor

Boston, MA 02110

Inside Massachusetts: 1-800-882-1498

Nation wide: 1-800-374-4405

Fax: (617) 426-9546

Hours of Operation: Monday – Friday, 9:00 AM – 5:00 PM (EST)

Workers’ Compensation Claims Mailing Address:

MIIA Member Services

One Federal Street

Boston, MA 02110

Phone: 1-800-799-6442

Fax: (617)753-9987

Property, Casualty, & Liability Claims Mailing Address:

MIIA Property & Casualty

12 Gill Street, Suite 1600

Woburn, MA 01801-1728

Phone: 1-800-526-6442

Fax: (781)376-9907

Health & Dental Subscriber Submission of Claims:
*Blue Cross Blue Shield of Massachusetts

Claims Department

P.O. Box 9131

North Quincy, MA 02171-9131

*Please note that in most cases, providers will submit your medical and dental claims for you electronically.

Health & Dental Enrollment & Eligibility:

MIIA Health Benefits Trust

One Winthrop Square, 2nd Floor

Boston, MA 02110

Phone: 1-800-374-4405

Fax: (617) 542-6513

Hours of Operation: Monday – Friday, 9:00 AM – 5:00 PM (EST)

Health & Dental Premium Invoice Remittance Only:

MIIA Health Benefits Trust

P.O. Box 5329

Boston, MA 02206-5329

Property & Casualty Invoice Remittance Only:

MIIA Property & Casualty Group, Inc.

P.O. Box 5092

Boston, MA 02206-5092

Workers’ Compensation Invoice Remittance Only:

MIIA Workers’ Compensation Group, Inc.

P.O. Box 5795

Boston, MA 02206-5795


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