contact-hmso-receptionistHighline Medical Services Organization

18000 Pacific Highway South, Suite 950
SeaTac, WA 98188
FAX (206) 878-1992

Email: Info@hmsoinc.org

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

Main Line: (206) 878-1985
Enrollment Assistance: Advantage Insurance Benefits (206) 612-5463
Referral Coordinator:  (206) 878-1827
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.