The Defense Health Agency (DHA) – Great Lakes (formerly known as MMSO) (DHA-GL) assists with the coordination of medical care for Remote
Active Duty and Remote Reserve Component Service Members on orders for 30 days or less with
Service approved line of duty conditions. For enrollment, other active duty, dependent, retiree and
all other questions contact your regional Managed Care Support Contractor or click
Hours of operation: Monday through Friday, 0800 to 1630, Central time.
Service members receiving treatment for line of duty conditions will not show as eligible
for care in the Defense Enrollment Eligibility Reporting System (DEERS). To verify
eligibility, contact the service member's unit administrator or medical representative.
All claims for line of duty medical care should be submitted to the Managed Care Support
Contractor serving the area in which the member lives.
For active duty TRICARE Prime Remote and Remote
Reserve Component Line of Duty care questions contact DHA-GL at:
Phone: 1-888-MHS-MMSO (1-888-647-6676) and follow menu prompts.
Defense Health Agency-GL
2834 Green Bay Road
North Chicago, IL 60064-3091
“On October 1, 2013, the Department of Defense established the Defense Health Agency (DHA) to manage the activities of the Military Health System. These activities include those previously managed by TRICARE Management Activity (TMA), which was disestablished on the same date. During the next several months, all TMA websites will change to reflect the new DHA. We appreciate your patience during this transition."
7700 Arlington Boulevard, Suite 5101, Falls Church, VA 22042-5101
The appearance of hyperlinks to external Web sites does not constitute
endorsement by the Defense Health Agency of these Web sites or the
information, products or services contained therein. For other than
authorized government activities. The Defense Health Agency does not
exercise any editorial control over the information you may find at other
locations. Such links are provided consistent with the stated purpose of
this DoD Web site. Accessibility/Section 508