Washington Medicaid Provider Enrollment Complete Guide to HCA, ProviderOne, and Apple Health in 2026
Washington State’s Medicaid program, branded Apple Health, covers close to 2 million residents and runs almost entirely through a single technology platform: ProviderOne, administered by the Washington State Health Care Authority (HCA). Enrollment is not optional paperwork; it is the gate that determines whether a claim gets paid at all, and it is separate from, and a prerequisite to, credentialing with any of Washington’s five Apple Health managed care organizations. This guide walks through exactly how Washington Medicaid provider enrollment works in 2026, what ProviderOne requires at each step, how the five MCOs fit into the picture, and where practices most often lose time to preventable errors.
What Is Washington Medicaid Provider Enrollment?
Washington Medicaid provider enrollment is the process by which physicians, nurse practitioners, physician assistants, behavioral health clinicians, facilities, and ancillary suppliers register with the Health Care Authority to order, refer, prescribe, or bill for services delivered to Apple Health clients. Federal law requires this registration before a provider can participate in the program in any capacity, and it applies whether the provider bills fee-for-service directly or only ever renders services under a managed care contract.
HCA administers this enrollment entirely through ProviderOne, the state’s electronic billing and provider-management system. Enrolling with an Apple Health MCO such as Molina or Coordinated Care does not substitute for ProviderOne enrollment; HCA enrollment must be completed and confirmed first, and each MCO runs its own separate credentialing review on top of it.
Apple Health: Washington's Medicaid Program Explained
Apple Health is simply Washington’s brand name for its Medicaid program, jointly funded by the state and the federal government and administered by HCA. Coverage includes medical, dental, vision, and behavioral health services, and most Apple Health clients receive care through managed care rather than fee-for-service. Close to two million Washingtonians carry Apple Health coverage, making it one of the highest-volume payers for practices throughout the state.
Clients receive a ProviderOne Services Card upon enrollment, which providers use to verify eligibility. The ProviderOne system also drives eligibility verification, prior authorization, claims submission, and payment for both fee-for-service and coordination-of-benefits scenarios.
The ProviderOne System and HCA Explained
ProviderOne is the single system of record for Washington Medicaid provider enrollment, claims, eligibility, and payment. Every new enrollment application, revalidation, and provider information update runs through ProviderOne’s Business Process Wizard (BPW). A separate system, OneHealthPort, handles single sign-on and patient eligibility verification access for many billers, but enrollment itself happens exclusively inside ProviderOne.
The online enrollment application can run up to 18 steps depending on provider type. Completing step one generates a 14-digit application ID number, which is also emailed to the address on file. This ID is essential: if the application cannot be finished in one sitting, the ID is what allows a provider to save progress and resume later.
Washington Medicaid at a Glance
| Category | Detail |
|---|---|
| State Medicaid Agency | Washington State Health Care Authority (HCA) |
| Enrollment System | ProviderOne (Business Process Wizard) |
| Program Brand | Apple Health |
| Total Enrollment | Close to 2 million Washingtonians (2026) |
| Number of MCOs | 5 statewide/regional Apple Health MCOs |
| Revalidation Cycle | Every 5 years (42 CFR Part 455) |
| Application Steps | Up to 18 steps depending on provider type |
| Eligibility/SSO Portal | OneHealthPort (separate from ProviderOne) |
| 2026 Institutional Application Fee | $750, effective January 1, 2026 |
| ProviderOne Help Desk | 1-800-562-3022 |
Enrollment Types: Billing, Performing, Nonbilling, and Billing Agent
Choosing the correct ProviderOne enrollment type before starting the application is the single most important decision in the entire process, because a solo practitioner, a clinician practicing under a group, and a managed-care-only nonbilling provider each follow different ProviderOne workflows.
- Billing provider: a solo provider, group, facility, agency, or organization that bills HCA directly and must sign a Core Provider Agreement
- Performing/rendering provider under a group: a licensed clinician practicing under an already-enrolled group or facility with its own Core Provider Agreement
- Nonbilling provider: used for managed-care-only participation, ordering/referring/prescribing roles, or other non-fee-for-service use cases
- Billing agent/clearinghouse: enrolled separately to track electronic HIPAA transaction data flow on behalf of billing providers
The Five Apple Health Managed Care Organizations
Apple Health managed care operates statewide through five MCOs. Amerigroup Washington rebranded to Wellpoint Washington beginning in 2024, and providers may still see both names in older materials and older payer records. UnitedHealthcare Community Plan’s Apple Health network is limited to the western half of the state, while the other four plans operate more broadly across Washington’s counties.
| MCO | Notes |
|---|---|
| Wellpoint Washington (formerly Amerigroup) | Rebranded from Amerigroup beginning January 2024 |
| Community Health Plan of Washington (CHPW) | Washington's local, not-for-profit Apple Health plan |
| Coordinated Care of Washington | Also administers statewide Apple Health Core Connections (foster care) |
| Molina Healthcare of Washington | Statewide Apple Health MCO |
| UnitedHealthcare Community Plan | Apple Health network limited to western Washington |
Let Stars Pro Handle Your Washington Medicaid Enrollment
From ProviderOne setup to Apple Health MCO credentialing — we manage the full timeline so your practice can stay focused on patients.
Step-by-Step ProviderOne Enrollment Process
The ProviderOne enrollment application walks providers through a structured, multi-step wizard. Depending on provider type, the process can run up to 18 steps, and each one must be completed accurately before the application can move forward.
- Step 1: Determine the correct enrollment type (billing, performing under a group, nonbilling, or billing agent/clearinghouse)
- Step 2: Gather required documentation, including licensure, NPI, and ownership disclosures
- Step 3: Access the ProviderOne Business Process Wizard and begin the online application
- Step 4: Complete the Basic Information step, confirming no duplicate enrollment already exists
- Step 5: Record the 14-digit application ID number generated after step one, in case the application must be resumed later
- Step 6: Complete all remaining steps, including federal tax details, service locations, and specializations
- Step 7: E-sign or upload required attachments, including the Core Provider Agreement and W-9
- Step 8: Pay the CY 2026 application fee if enrolling as an institutional provider type
- Step 9: Submit the completed application and monitor for any HCA requests for additional information
- Step 10: Upon approval, proceed to Apple Health MCO credentialing for managed care network participation
Required Documentation for Enrollment
ProviderOne requires both standard and provider-specific documentation, and the exact list depends on the enrollment type and provider category selected at the start of the application.
| Provider Category | Typical Required Documentation |
|---|---|
| Individual/solo billing provider | State license, NPI confirmation, Core Provider Agreement, W-9 |
| Group or facility | FEIN, ownership/control disclosure, Core Provider Agreement, roster of performing providers |
| Performing provider under a group | License, NPI, group association confirmation (group must already be enrolled) |
| Nonbilling provider | License/certification and identifying information for managed-care or ORP purposes |
| Billing agent/clearinghouse | EDI trading partner details for HIPAA transaction tracking |
| Institutional provider | Accreditation/licensure, disclosure of ownership and control interest form |
8. The 2026 Application Fee and Institutional Provider Requirements
Beginning January 1, 2026, the Apple Health (Medicaid) provider enrollment application fee increases to $750, up from $730 in 2025, following the CMS annual inflation adjustment under 42 CFR 455.460. Washington requires this fee for institutional provider enrollment applications specifically; providers already enrolled with Medicare, and providers currently enrolled with Apple Health, are generally not affected.
| Fee Detail | 2026 Requirement |
|---|---|
| Apple Health application fee (effective Jan 1, 2026) | $750 (up from $730 in 2025) |
| Who pays it | Institutional provider enrollment applications |
| Who is generally exempt | Providers enrolled with Medicare; providers already enrolled with Apple Health |
| Legal basis | 42 CFR 455.460, CMS annual CPI-U adjustment |
| Notification method | HCA notifies affected providers when the fee is required |
CAQH, NPI, and Core Provider Agreement Alignment
ProviderOne data must align tightly with a provider’s CAQH profile, NPPES taxonomy record, and signed Core Provider Agreement. A mismatch between the legal business name on a W-9 and the Provider Name field in ProviderOne, an outdated CAQH attestation, or an incorrect federal tax classification are among the most common reasons an application stalls before it ever reaches full review.
| System/Document | What HCA Checks | Common Failure Point |
|---|---|---|
| W-9 | Legal name and federal tax classification must match ProviderOne exactly | Mismatched business name or entity type |
| CAQH ProView | Current attestation, license, and malpractice data | Expired attestation left unrenewed |
| NPPES | Active NPI and correct taxonomy for services rendered | Taxonomy not updated after a specialty change |
| Core Provider Agreement | Signed and matching provider identification on file | Unsigned or outdated agreement version |
Processing Timelines and What to Expect
Total time to approval depends heavily on provider type, completeness of the initial submission, and how quickly a provider responds to any HCA request for additional information. Multi-location groups and institutional providers should plan for the longer end of the range.
| Stage | Typical Duration | Notes |
|---|---|---|
| Document preparation | 1–2 weeks | Faster with current CAQH and licensure data on hand |
| ProviderOne application completion | 1 session to several days | Up to 18 steps; save progress using the application ID |
| HCA review and validation | 2–6 weeks | Includes federal database and OIG/SAM exclusion screening |
| Response to HCA information requests | Varies | Delayed response is the leading cause of extended timelines |
| Apple Health MCO credentialing | 60–180 days per plan | Runs separately, after ProviderOne approval |
Five MCOs, Five Separate Applications — Let Us Coordinate Them
Stars Pro manages ProviderOne enrollment and all five Apple Health MCO credentialing tracks in parallel, so nothing falls behind.
Revalidation: The 5-Year Cycle and Business Process Wizard
Federal regulations under 42 CFR Part 455 require HCA to revalidate every enrolled Medicaid provider once every five years. Washington notifies providers by mail; no action is required until that letter arrives. When selected, a single revalidation letter is mailed to the group or facility, not to each individual clinician working within it, and it is sent to the mailing address on file in ProviderOne.
| Milestone | Timing | Consequence if Missed |
|---|---|---|
| Revalidation letter received | Day 0 | No action required until this letter arrives |
| Deadline to complete revalidation | 30 days from notice date | Deactivation notice generated if missed |
| Deactivation notice grace window | Additional 90 days | Medicaid billing privileges affected if still incomplete |
| Billing provider revalidation method | ProviderOne Business Process Wizard | Use the "Manage Provider Information" link to submit updates |
| Nonbilling provider revalidation method | HCA support portal or fax | Fax: 360-725-1259 (nonbilling providers lack ProviderOne access) |
Providers must also submit updated disclosures of ownership, managing employees, and other required attestations as part of every revalidation, not only the credentials themselves.
Common Denial Reasons and How to Avoid Them
Washington Medicaid provider enrollment applications are most commonly denied or delayed for a small, predictable set of reasons. Reviewing this list before submission catches the majority of issues before they reach HCA.
| Denial/Delay Reason | Impact | How to Prevent It |
|---|---|---|
| Incomplete documentation | Application held pending missing items | Cross-check the provider-specific document list before submitting |
| Incorrect NPI type selected | Rejection or rework | Confirm NPI-1 vs NPI-2 matches the enrollment type |
| Expired state license | Application denial | Verify license status before starting the application |
| OIG/SAM exclusion list match | Denial pending resolution | Run an internal exclusion check before submitting |
| Unattested CAQH profile | Processing delay | Attest CAQH on a recurring internal calendar |
| Errors in the Core Provider Agreement | Application returned for correction | Match legal name and tax classification exactly to the W-9 |
MCO Credentialing: A Separate Process from ProviderOne
Completing ProviderOne enrollment confirms a provider is eligible to participate in Apple Health, but it does not put that provider on any MCO’s network panel. Each of the five Apple Health MCOs runs its own credentialing process, typically taking 60 to 180 days, with its own fee schedule, panel requirements, and application. A practice that wants to see patients across all five plans is managing five separate credentialing tracks on top of the initial HCA enrollment.
| MCO | Fax/Contact for Provider Changes |
|---|---|
| Wellpoint Washington | Fax: 1-866-840-4993 |
| Coordinated Care of Washington | Fax: 1-877-644-4613 |
| Molina Healthcare of Washington | Fax: 1-877-556-5873 |
| Community Health Plan of Washington | chpw.org provider resources |
| UnitedHealthcare Community Plan | uhc.com/communityplan/washington |
2026 Policy Changes Providers Should Watch
Several federal and state-level changes are set to reshape Washington’s Medicaid landscape starting in late 2026, and much of the implementation timeline currently depends on pending litigation, meaning dates could shift. Credentialing teams should track these closely rather than treating current rules as fixed for the year.
| Change | Expected Impact | Status |
|---|---|---|
| Non-citizen Apple Health coverage ends | Coverage loss for affected enrollees | Scheduled October 2026 |
| Work requirements begin | New eligibility condition for some populations | Scheduled December 2026 |
| Cost-sharing up to $35 per service | New client cost exposure | Phasing in with federal H.R. 1 provisions |
| State-Directed Payments cap reduction (6% to 3.5%) | Lower supplemental payment ceiling | Scheduled to begin 2028 |
| Projected coverage loss statewide | 100,000–320,000 Washingtonians | Estimate; implementation largely paused pending litigation |
Why Partner with Stars Pro for Washington Medicaid Credentialing
Between the up-to-18-step ProviderOne application, the CY 2026 institutional fee, five separate MCO credentialing tracks, and a five-year revalidation cycle with a hard 30-day-then-90-day deactivation clock, Washington Medicaid enrollment carries more moving parts than most practices expect when they attempt it in-house.
| Factor | Handling It Yourself | With Stars Pro |
|---|---|---|
| Enrollment type selection | Trial and error across ProviderOne workflows | Matched precisely to your practice structure |
| CAQH/NPI/Core Provider Agreement alignment | Manual, error-prone cross-checking | Verified against NPPES and CAQH before submission |
| HCA information requests | Often delayed by internal handoffs | Monitored and answered within days |
| Revalidation tracking | Easy to miss the 30-day window | Calendared and proactively managed |
| Apple Health MCO credentialing | Five separate, sequential submissions | Coordinated across all five MCOs |
| 2026 policy monitoring | Manual bulletin tracking | Actively monitored on your behalf |
Stars Pro’s credentialing specialists manage every stage, from selecting the correct ProviderOne enrollment type through Apple Health MCO network credentialing, so your practice avoids the denial cycles, fee errors, and revalidation lapses that stall reimbursement for providers who navigate HCA alone.
Key Washington Medicaid Contacts
| Purpose | Contact |
|---|---|
| ProviderOne Help Desk / Provider Enrollment | 1-800-562-3022, ext. 16137 |
| Nonbilling provider revalidation fax | 360-725-1259 |
| Apple Health client customer service | 1-800-562-3022 (TTY: 711) |
| OneHealthPort (eligibility/SSO access) | onehealthport.com |
| ProviderOne registration questions | providerone@dshs.wa.gov |
Ready to Get Enrolled with Washington Medicaid the Right Way?
Stars Pro manages your entire ProviderOne and Apple Health MCO credentialing journey — accurately, proactively, and on schedule.
Frequently Asked Questions
Do I need to enroll separately with each Apple Health MCO?
Yes. ProviderOne enrollment with HCA must be completed and confirmed first, but each Apple Health MCO you want to join, such as Molina or Coordinated Care, runs its own separate credentialing process on top of your HCA enrollment.
How long does Washington Medicaid provider enrollment take?
There is no single fixed timeline. Document preparation and the ProviderOne application itself can take days, but full HCA review, including federal database screening, commonly adds several weeks, and delays in responding to HCA requests are the most common cause of longer timelines.
What is the ProviderOne application ID and why does it matter?
It is a 14-digit number generated after completing step one of the online application, and it is also emailed to the address on file. It allows a provider to save progress and resume the application later if it cannot be completed in one session.
Does CAQH enrollment replace ProviderOne enrollment?
No. CAQH is used for credentialing cross-reference purposes, but it does not substitute for the ProviderOne enrollment application itself, which must be completed directly with HCA.
How often must I revalidate my Washington Medicaid enrollment?
At least every five years, under 42 CFR Part 455. Providers have 30 days from the date on the revalidation notice to complete it before a deactivation notice is generated, followed by an additional 90-day window before billing privileges are affected.
What is the 2026 application fee and who has to pay it?
Beginning January 1, 2026, the Apple Health application fee is $750. It applies to institutional provider enrollment applications; providers already enrolled with Medicare or currently enrolled with Apple Health are generally not affected.
What is the difference between a billing and a nonbilling provider?
A billing provider bills HCA directly and signs a Core Provider Agreement. A nonbilling provider is enrolled for managed-care-only participation or ordering/referring/prescribing purposes and does not have ProviderOne portal access in the same way.
Can a clinician practicing under a group skip enrolling separately?
A performing or rendering provider under a group still needs their own enrollment record tied to the group’s existing Core Provider Agreement; the group itself must already be enrolled before this can be completed.
What happens if I miss the 30-day revalidation deadline?
HCA generates a deactivation notice, giving an additional 90 days to complete revalidation. Missing that extended deadline affects Medicaid billing privileges until the revalidation is completed.
Are more changes to Washington Medicaid enrollment coming in 2026?
Yes. Federal legislation is expected to bring work requirements, new cost-sharing, and eligibility changes starting in late 2026, though much of the implementation is currently paused pending litigation, so providers should monitor HCA bulletins for updated timelines.
Get Enrolled with Confidence
Washington Medicaid enrollment rewards accurate, complete ProviderOne submissions and proactive revalidation tracking, and it penalizes documentation mismatches with real delays in reimbursement. Stars Pro’s credentialing team manages the full ProviderOne and Apple Health MCO process for physicians, nurse practitioners, and healthcare organizations across Washington, so your practice starts billing sooner and stays compliant through every five-year revalidation cycle.
Partner with Stars Pro for Washington Medicaid Credentialing
Contact our team today to start your ProviderOne enrollment, Apple Health MCO credentialing, or 5-year revalidation the right way.