Navigating the state-specific Medicaid portal requirements for credentialing services in Washington is critical to avoiding claim denials.

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Washington’s Apple Health program serves over 2 million beneficiaries through five managed care organizations under its Integrated Managed Care (IMC) model that combines physical health, behavioral health, and substance use disorder treatment under a single MCO contract.


What Is the ProviderOne Portal?

ProviderOne is Washington’s centralized provider enrollment, claims, and eligibility portal operated by the Health Care Authority (HCA).

Step-by-Step Apple Health Enrollment

1

Register on ProviderOne

Create account with NPI, Tax ID, WA license. ProviderOne uses a domain-based access model.

2

Complete Application

Demographics, WA license, specialties, locations, ownership disclosures, billing config.

3

Upload Documents

WA license, NPI, W-9, EIN, liability insurance, DEA, voided check, ownership forms.

4

Complete Screening

OIG/SAM, WA DOH verification, WSP background for high-risk, site visits for facilities.

5

Submit

Processing: 30–45 days.

6

Credential with Apple Health MCOs

After ProviderOne approval, credential with regional MCOs.


Washington’s Five-MCO Landscape

MCOParentRegions
Molina Healthcare of WAMolinaMultiple regions; strong statewide
Coordinated Care (Ambetter)CenteneMultiple regions
Community Health Plan of WACommunity networkMultiple regions; strong rural
Amerigroup WAElevanceKing County/Puget Sound
UnitedHealthcare Community PlanUnitedHealthMultiple regions

MCO availability varies by HCA region. Not all five operate in every region.

Regional Assignment: WA assigns MCOs by HCA region. Research which plans serve YOUR region before credentialing. Amerigroup primarily serves King County/Puget Sound.

Integrated Managed Care

Washington fully integrated physical health, behavioral health, and SUD treatment under MCO contracts statewide.

  • One MCO credential covers physical, BH, and SUD services
  • No separate BH carve-out enrollment
  • MCOs manage full continuum of care

Advantage: WA’s IMC model means one MCO credential = full service coverage. No separate BH enrollment needed. Prioritize Molina (broadest regional coverage) first.


Frequently Asked Questions

How long does WA enrollment take?

ProviderOne: 30–45 days. MCO: 30–60 days. Total: 60–105 days.

Does WA integrate behavioral health?

Yes. Full IMC model — physical, BH, SUD under single MCO contract.

Need Help With Washington Medicaid Enrollment?

Our team handles Washington enrollment end-to-end.

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JR

James Reyes, CPC

Senior Credentialing Specialist with 15+ years of experience navigating state Medicaid portals, Medicare PECOS, and commercial payer panels. Certified Professional Coder (CPC) dedicated to eliminating revenue cycle bottlenecks.