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Medicaid Washington

Medicaid WA

Primary payer ID
AIDWACompare transaction IDs ↓
Last successful claim statusWithin the past 3 monthsObserved across Substrate's claim-status network.
Not enough dataEDI 276/277EDI 270/271

Is your practice experiencing high volumes of no response claims or denials from Medicaid Washington? Try Substrate Denial Intelligence here -->.

Coverage profile

How Substrate can help you with Medicaid Washington

Substrate can help practices and billers with the following claims tasks for Medicaid Washington.

Claim status

EDI 276/277

The Substrate Claim Status Agent can check clearinghouse claim status for your practice with Medicaid Washington.

Available

Eligibility

EDI 270/271

The Substrate Eligibility Agent can verify patient benefits, identify TPAs and carve-outs, and more with Medicaid Washington.

Available

2027 maternity billing research

When does Medicaid Washington change OB/GYN billing?

Confirmed 2027 guidance

Transition begins 2027-01-01. Use current billing through 2026 and individual services beginning 2027; report 0500F with a reimbursable E/M beginning 2027.

Transition start
2027-01-01
Billing start
2027-01-01
Published
2026-05
Current As Of
August 2026

Scope: state Medicaid guidance; plan-specific operational guidance not located

Open Medicaid Washington in the payer explorer →
Direct policy ↗Upstream page ↗

Pregnancy-related billing codes FAQ. Verify the payer source before claim submission.

Frequently asked questions

Medicaid Washington payer FAQs

How do I check claim status with Medicaid Washington?

Providers check Medicaid Washington via EDI 276/277 when the payer ID is accepted. Substrate automates claim status across 3,500+ payers.

What is the payer ID for Medicaid Washington?

The primary payer ID for Medicaid Washington is AIDWA. The correct routing ID can differ by clearinghouse and transaction, so compare the 837P, 837I, 835, 270, and 276 entries before submitting.

What are the 837 payer IDs for Medicaid Washington?

The 837P and 837I payer ID for Medicaid Washington is AIDWA via Stedi.

What is the 835 payer ID for Medicaid Washington?

The 835 payer ID for Medicaid Washington is AIDWA via Stedi.

What is the 270 payer ID for Medicaid Washington?

The 270 payer IDs for Medicaid Washington are AIDWA via Stedi and AIDWA via Availity.

What is the 276 payer ID for Medicaid Washington?

The 276 payer ID for Medicaid Washington is AIDWA via Stedi.

What state does Medicaid Washington operate in?

Medicaid Washington operates in WA.

Resource library

Routing reference

Medicaid Washington payer IDs and operating states

Use the payer ID listed for the transaction you are submitting. Verify current routing and enrollment requirements with your clearinghouse.

Medicaid Washington payer name, operating states, and transaction-specific payer IDs
Payer nameMedicaid WashingtonSource: Substrate payer directory · last refreshed
Operating statesWASource: Substrate payer directory · last refreshed
837P professional claims payer IDStediAIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID
837I institutional claims payer IDStediAIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID
835 ERA payer IDStediAIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID
270 eligibility payer IDStediAIDWASource: Stedi payer catalog · catalog dated · matched by payer ID
270 eligibility payer IDAvailityAIDWASource: Availity payer catalog · catalog dated · matched by payer ID
276 claim status payer IDStediAIDWASource: Stedi payer catalog · catalog dated · matched by payer ID

Routing sources and verification

  • Substrate payer directoryPayer identity, aliases, operating states, and vendor IDs. Last refreshed .Open payer website ↗
  • Stedi payer catalogMatched by payer ID; matched record: Medicaid Washington. Source dated .PrimaryPayerId is used as the transaction payer ID when the corresponding Stedi support flag is true.Open current Stedi reference ↗
  • Availity payer catalogMatched by payer ID; matched record: MEDICAID WASHINGTON (PROVIDER ONE). Source dated .The attached API workbook supplies 270 and 276 payer IDs only. It does not supply 837P, 837I, or 835 IDs.Open current Availity reference ↗

Clearinghouse payer IDs are transaction-specific and can change. Confirm the current payer list and the member’s ID card before submission.

Payer contact directory

Medicaid Washington phone and fax numbers

Use the number associated with your task. These contacts were stated in successful eligibility responses and may apply to specific benefits, products, or departments.

Payer phone
(800) 562-3022WA State DSHS
Medicaid Washington payer phone and fax directory
Channel and numberPayer NotesDepartmentSpecialties
phone(800) 869-7165Behavioral health, Other stated contextBenefit context: Managed Care Coordinator
  • MHC Behavioral Health Services Only
  • MHC Fully Integrated Managed Care
phone(877) 644-4613Behavioral health, Other stated contextBenefit context: Managed Care Coordinator
  • CCW Behavioral Health Services Only
  • CCW Fully Integrated Managed Care
phone(800) 665-1029Other stated contextBenefit context: Managed Care Coordinator
  • DSNP Molina Healthcare of Washington Inc
phone(833) 731-2167Other stated contextBenefit context: Managed Care Coordinator
  • WLP Fully Integrated Managed Care
phone(800) 562-3022
  • WA State DSHS

Phone and fax numbers sourced directly from the payer response

Other aliases

Also known as

  • 10424
  • 12K27
  • 1482
  • 77045
  • 916001088
  • AIDWA
  • CKWA1
  • SKWA0
  • WACAID
  • WAMCD
  • Apple Health
  • Medicaid Washington (ProviderOne)
  • Washington Apple Health
  • Washington Medicaid
  • Washington State Department of Social and Health Services
  • Washington State Health Care Authority
  • MEDICAID WASHINGTON (PROVIDER ONE)
  • MEDICAIDWA