PO Box 24897
Seattle, WA 98124-0897
FAX (206) 834-6000
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
Authorizations and Referrals: (206) 878-1985, ext. 4
Provider Relations: (206) 724-0869
Claims Inquiries: (206) 878-1985, ext. 3
Payer ID for Claims
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.