Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sonja Lynn Mcmillan, SUDP

Addiction (Substance Use Disorder) Counselor in Oakville, WA · enumerated 2009.

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

National Provider Identifier

1134363963

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Registry record

Entity type Individual (Type 1)

Name Sonja Lynn Mcmillan

Credential SUDP

Sex Female

Practice address 21 Niederman Rd Ste C, Oakville, WA, 98568

Phone (360) 709-1733

Enumeration date Apr 23, 2009

Last updated in NPPES Jan 14, 2026

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License CP60449347 (WA) Primary

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.

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Frequently asked questions

Where does Sonja Mcmillan practice?

The practice location on file with NPPES is in Oakville, WA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Sonja Mcmillan?

The National Provider Identifier (NPI) for Sonja Mcmillan is 1134363963, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-14.