contact-hmso-receptionistHighline Medical Services Organization

PO Box 24897
Seattle, WA 98124-0897
FAX (206) 834-6000

Email: Info@hmsoinc.org

Specific Phone Numbers:
We answer phones between 8:00 am – 4:00 pm

Main Line: (206) 878-1985
Enrollment Assistance: (206) 878-1985, ext. 246
Authorizations and Referrals:  (206) 878-1985, ext. 4
Provider Relations: (206) 724-0869
Claims Inquiries: (206) 878-1985, ext. 3

Payer ID for Claims
91164

Communication services are available free of charge for enrollees to discuss utilization management issues. Utilizing the phone tree after-hours callers may leave staff a confidential voice mail or send a confidential fax.

  • Collect calls can be accepted by staff to respond to utilization management issues.
  • Language assistance is available upon request with the assistance of participating providers by contacting HMSO Medical Management staff.
  • TDD/TTY services will be coordinated through the delegating health plan.
  • Enrollees contact the plan’s TDD/TYY number and request a conference with HMSO Medical Management staff.

Utilizing the phone tree after-hours callers may leave staff a confidential voice mail or send a confidential fax.