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Military Health System

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Military Medical Support Office at Defense Health Agency, Great Lakes

The Military Medical Support Office (MMSO) at Defense Health Agency–Great Lakes authorizes medical care in the United States and District of Columbia for:

  • Active duty service members enrolled in TRICARE Prime Remote
  • Service members, active and reserve, enrolled in TRICARE Prime who don't have an assigned primary care manager
  • Reserve Component service members in remote areas with a Service-connected line of duty injury, illness or disease
  • Service members properly referred to Veteran's Affairs medical facility for care under the DOD/VA Memorandum for Agreement for a Spinal Cord Injury, Traumatic Brain Injury, or Blindness

Are you in a remote location?

A remote location is 50 miles or an hour's drive time from a military hospital or clinic. If you're not sure, go to the Military Hospital and Clinic Locator:

  • Enter your home ZIP code
  • Change mileage to 75 miles

If you are within 50 miles of military hospital or clinic and need help, go to the Customer Service Directory and enter name of nearest military base.

What We Do

As a section of the DHA TRICARE Health Plan branch, the MMSO:

  • Provides authorizations for civilian health care services for Service members listed above.
  • Reviews and authorizes certain specialty care referrals for TPR-enrolled Service members.
  • Collaborates with Reserve/National Guard unit representatives regarding LOD care for their Service members in remote locations
  • Provides authorization (pre-, concurrent and retro-) for active duty service members accepted for VA medical care under the DOD/VA MOA for diagnosis for SCI, TBI or blindness
  • Authorizes the payment of civilian medical claims for certain Service members


Review the guides below for MMSO processes and procedures.

Request Worksheets

The worksheets below are submitted to the MMSO. Instructions and addresses are found on each worksheet.

DHA-GL Worksheet-01: Medical Eligibility Verification4/10/2017
DHA-GL Worksheet-02: Pre-Authorization Request5/31/2018
Formal Appeal Request6/1/2014
Last Updated: September 14, 2023
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