Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Corbell Mckay, M.ED.

Mental Health Counselor in Tulalip, WA · enumerated 2008.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1336399955

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Registry record

Entity type Individual (Type 1)

Name Mr. William Corbell Mckay

Credential M.ED.

Sex Male

Practice address 2821 Mission Hill Rd, Tulalip, WA, 98271

Phone (360) 716-4326

Fax (360) 651-4404

Enumeration date Sep 19, 2008

Last updated in NPPES Sep 19, 2008

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License LH 00003498 (WA) Primary

Other identifiers

Identifier	Type	State	Issuer
1992791	Medicaid	WA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1336399955 active?

Yes, as of the latest NPPES snapshot, NPI 1336399955 is active (record last updated 2008-09-19).

How do I verify William Mckay's NPI record?

Cross-check NPI 1336399955 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-19.