Billers, providers, and partners

Contact us

Who to contact when

For questions about
  • Billing and claims
  • Service Card requests
  • Apple Health (Medicaid) health plan enrollments
  • Benefit questions
  • Technical issues with ProviderOne (providers only)

Medical Assistance Customer Service Center (MACSC)

Important! If you need assistance on a claim close to the two-year timely filing deadline, please type "Urgent, timely issue." in the Other Comments box.

Phone: 1-800-562-3022 (choose "provider services")
Long waits are sometimes required, but self-service options are available using the web forms above.

TRS: 711 through Washington Relay.

For questions about
  • Comments
  • Complaints
  • Legislative and government inquiries



Note: This is not a secure communication and should not include any personal health information. Please include a Services Card number for identification purposes and faster service.

For questions about
  • Reporting suspected Medicaid fraud


Phone: 1-800-562-6906 or send us an email at

For questions about
  • Being locked out of ProviderOne

ProviderOne Security

Users can unlock their own accounts by using the password reset functionality in ProviderOne.

If you are still having issues, you must contact your organization/office’s system administrator for assistance. If you are a system administrator, email to regain system access.

For questions about
  • Professional rates and fee schedules

Professional rates


For questions about
  • Hospital rates, payments, and fee schedules

Office of Hospital Finance

  • Section manager: 360-725-1835
  • Ambulance and ITA transportation: 360-725-2130
  • Ambulatory surgery centers (ASC): 360-725-2130
  • Certified public expenditure (CPE): 360-725-1290
  • Critical access hospitals (CAH): 360-725-1835
  • Disproportionate share hospital (DSH): 360-725-9820
  • Hospital safety net assessment (HSNA): 360-725-1577
  • Inpatient program: 360-725-0938
  • Nursing home proshare: 360-725-9820
  • Out-of-state hospital contracts: 360-725-9820
  • Out-of-state transportation: 360-725-2130
  • Outpatient program: 360-725-1311
  • Professional services supplemental payments (ASSP and PSSP): 360-725-1577
  • Trauma Care Fund supplemental payments: 360-725-9820

Regular mail

Office of Hospital Finance
Health Care Authority
PO Box 45510
Olympia, WA 98504-5510

Certified and FedEx mail

The sender cannot send this type of mail to a post office box. Refer to the USPS or FedEx mailing forms for their specific format.

Office of Hospital Finance
Health Care Authority (optional)
Cherry Street Plaza 5th Floor (MS:45510)
626 8th Avenue SE
Olympia, WA 98501