Medical Billing Services in Washington
Washington is a two-Blues state — Premera Blue Cross and Regence BlueShield split the market with separate contracts, portals and edit logic — layered over Kaiser Permanente Washington (the former Group Health) running its integrated model in the Puget Sound. Medicaid, branded Apple Health, gives providers a full 365 days through the ProviderOne system, with most members in managed care led by Molina and Coordinated Care. Washington's insurance regulations hold carriers to a 30/60-day claims-payment standard, and the Seattle tech employer base means some of the richest commercial plans in the country sit alongside rural counties with heavy Apple Health mix east of the Cascades.
Apple Health: filing rules that decide whether you get paid
Administered by the Washington State Health Care Authority (HCA)
Apple Health fee-for-service claims carry a 365-day window from the date of service, filed and managed through ProviderOne, which also handles enrollment and revalidation. Most members are in managed care — Molina Healthcare of Washington carries the largest enrollment, alongside Coordinated Care (Centene), Community Health Plan of Washington, UnitedHealthcare Community Plan and Wellpoint — with plan manuals governing filing and auth for their members. Washington runs integrated managed care statewide, folding behavioral health into the physical-health plans rather than carving it out, which simplifies routing compared to carve-out states like Pennsylvania.
Deadlines for every major payer — including Washington Medicaid — live in our timely filing limits tool, with an interactive deadline checker.
The payers we bill every day in Washington
Washington billing rules that move real money
Claims-payment standard (WAC 284-170-431)
Washington regulation requires carriers to pay 95% of clean claims within 30 days and 95% of all claims within 60 days of receipt, with interest on late payment. The Office of the Insurance Commissioner is an active regulator that takes provider complaints seriously — systematic slow-pay is worth documenting and escalating here.
Integrated behavioral health
Washington completed statewide integration of behavioral health into Apple Health managed care, so mental health and SUD services bill to the member's medical plan rather than a separate BH carve-out — a genuine simplification, but one that moved BH billing under each MCO's medical edit logic and auth lists.
Where we work in Washington
We support practices across the state remotely — same-day claim submission and a dedicated team regardless of your zip code. The markets we serve most:
Credentialing & enrollment in Washington
Physician licensing in Washington runs through the Washington Medical Commission, and payer enrollment is its own workstream on top of it — state Medicaid enrollment, CAQH upkeep, and individual plan contracting each on their own timeline. Our credentialing service manages the full stack for Washington providers, and our credentialing calculator estimates realistic timelines by payer.
Washington billing FAQs
What is the timely filing limit for Apple Health?
365 days from the date of service for fee-for-service claims through ProviderOne. Managed care plans — Molina, Coordinated Care, CHPW, UHC and Wellpoint — set their own limits in their provider manuals, so verify per plan.
What's the difference between Premera and Regence?
They're Washington's two separate Blue plans — different companies with different provider contracts, portals, edits and appeal routes. A practice credentialed with one is not credentialed with the other; we maintain both relationships in parallel.
How fast must Washington insurers pay claims?
WAC 284-170-431 requires 95% of clean claims paid within 30 days and 95% of all claims within 60, with interest on late payment. We benchmark each carrier against that standard and escalate chronic offenders to the OIC.
Does behavioral health bill separately in Washington?
No — Washington integrated behavioral health into Apple Health managed care, so BH services bill to the member's medical plan. Each MCO applies its own auth and edit rules to BH codes, which is where most BH denials here originate.
Medical billing services in other states
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