Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Joan S Simon Oncken, LMFT

Marriage & Family Therapist in Lynnwood, WA · enumerated 2008 · practices at Oncken Counseling Services.

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

National Provider Identifier

1720256183

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Registry record

Entity type Individual (Type 1)

Name Joan S Simon Oncken

Credential LMFT

Sex Female

Practice address Lynnwood, WA, 98036

Phone (425) 771-1914

Fax (425) 771-0127

Enumeration date Feb 19, 2008

Last updated in NPPES Feb 19, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License LF00000836 (WA) Primary

LMFT · Licensed Marriage and Family Therapist: A licensed therapist specializing in relational and family psychotherapy. About the LMFT credential

Other identifiers

Identifier	Type	State	Issuer
243165	Other	WA	MHN
253936	Other	WA	VALUE OPTIONS
5777726	Other	WA	AETNA
ON4514	Other	WA	REGENCE

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 Joan Simon Oncken practice?

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

What is the NPI number for Joan Simon Oncken?

The National Provider Identifier (NPI) for Joan Simon Oncken is 1720256183, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Oncken Counseling Services Marriage & Family Therapist · Lynnwood, WA NPI 1396841466 Allan Zalewski Dentist · Lynnwood, WA NPI 1588750541 Jeffrey Pearson General Practice Dentistry · Lynnwood, WA NPI 1942490560 Gerald Oncken Counselor · Lynnwood, WA NPI 1265600274

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-19.