Your Contacts

TRICARE East Region

Humana Military

800-444-5445

TRICARE East Region Website


TRICARE West Region

TriWest Healthcare Alliance

888-TRIWEST (874-9378)

TRICARE West Region Website


TRICARE For Life

U.S. and U.S. Territories:
WPS Government Services
866-773-0404
(TDD: 866-773-0405)

All Other Overseas Areas:
International SOS Government Services, LLC
Country-Specific Toll-Free Numbers


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Referrals and Pre-Authorizations

A referral is when your primary care manager or provider sends you to another provider for care that they don’t provide.

A pre-authorization is when your regional contractor approves your care before you go to your appointment. If you’re being referred, your provider will get you a referral and pre-authorization at the same time.

When care is approved:

Your regional contractor sends you an authorization letter with specific instructions. You can find this letter in your region’s patient portal.

You must:

  • Book your appointment with the provider listed in the authorization letter. If you need to find another provider, contact your regional contractor.
  • Get care before the authorization expires. Otherwise, you’ll need to get the care reapproved.

Note: Active duty service members need a referral for most care received outside of their assigned military hospital or clinic.

Looking to book an appointment online at a military hospital or clinic?
You can use the MHS GENESIS Patient Portal to book an appointment.
Service Point of Contact Information
  • Department of Defense SPOCs (Army, Air Force, Navy, and Marine Corps) are located at the Military Medical Support Office at Defense Health Agency—Great Lakes.
  • U.S. Public Health Service and National Oceanic and Atmospheric Administration SPOCs are located at the Medical Affairs Branch of the Office of Commissioned Corps Support Services.
  • U.S. Coast Guard personnel should call the Coast Guard Benefits Line.

Last Updated 8/20/2025