Coverage profile
Work Medicaid Washington across every published route
Use the current payer record to choose the right claim-status, eligibility, portal, phone, or appeals workflow. Substrate only marks routes that are published for this payer.
Claim status
EDI 276/277The Substrate Claim Status Agent can check clearinghouse claim status for your practice with Medicaid Washington.
Eligibility
EDI 270/271The Substrate Eligibility Agent can verify patient benefits, identify TPAs and carve-outs, and more with Medicaid Washington.
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
2027 maternity billing research
When does Medicaid Washington change OB/GYN billing?
Effective January 1, 2027, HCA will remove deleted global obstetrics codes from Apple Health billing guides and fee schedules; providers will use new and revised CPT codes aligned with updated Apple Health clinical policy. Beginning January 1, 2027, bill the first prenatal visit with the appropriate E/M code and CPT 0500F. The E/M code is reimbursable; 0500F is billed at $0.01 and pays zero.
- Transition start
- 2027-01-01
- Billing start
- 2027-01-01
- Published
- 2026-05
- Current As Of
- August 2026
Scope: Washington Apple Health (Medicaid) pregnancy-related professional/clinical services in hospital and out-of-hospital settings. This is direct state-program guidance, not evidence of named managed-care plan adoption or requirements for commercial, Medicare, dental or vision products.
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.
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.
| Payer name | Medicaid WashingtonSource: Substrate payer directory · data last changed |
|---|---|
| Operating states | WASource: Substrate payer directory · data last changed |
| 837P professional claims payer IDStedi | AIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID |
| 837I institutional claims payer IDStedi | AIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID |
| 835 ERA payer IDStedi | AIDWAEnrollment requiredSource: Stedi payer catalog · catalog dated · matched by payer ID |
| 270 eligibility payer IDStedi | AIDWASource: Stedi payer catalog · catalog dated · matched by payer ID |
| 270 eligibility payer IDAvaility | AIDWASource: Availity payer catalog · catalog dated · matched by payer ID |
| 276 claim status payer IDStedi | AIDWASource: Stedi payer catalog · catalog dated · matched by payer ID |
Routing sources and verification
- Substrate payer directoryPayer identity, aliases, operating states, and vendor IDs. Data last changed ; checked .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
| Channel and number | Payer Notes | Department | Specialties |
|---|---|---|---|
| phone(800) 869-7165 | Behavioral health, Other stated contextBenefit context: Managed Care Coordinator |
| |
| phone(877) 644-4613 | Behavioral health, Other stated contextBenefit context: Managed Care Coordinator |
| |
| phone(800) 665-1029 | Other stated contextBenefit context: Managed Care Coordinator |
| |
| phone(833) 731-2167 | Other stated contextBenefit context: Managed Care Coordinator |
| |
| phone(800) 562-3022 |
|
Phone and fax numbers sourced directly from the payer response