Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Maier

Counselor in Seattle, WA · enumerated 2009.

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

National Provider Identifier

1346479052

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Registry record

Entity type Individual (Type 1)

Name William Maier

Sex Male

Practice address 1200 5th Ave Ste 800, Seattle, WA, 98101

Phone (206) 374-0109

Enumeration date Jul 2, 2009

Last updated in NPPES Feb 23, 2023

Taxonomy & licenses

171M00000X Case Manager/Care Coordinator Other Service Providers Secondary

101Y00000X Counselor Behavioral Health & Social Service Providers · License RC6010404 (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

How do I verify William Maier's NPI record?

Cross-check NPI 1346479052 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1346479052 active?

Yes, as of the latest NPPES snapshot, NPI 1346479052 is active (record last updated 2023-02-23).

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Karen Berlin Psychiatry Physician · Seattle, WA NPI 1740346261 Travis Osborne Clinical Psychologist · Seattle, WA NPI 1649480906 Rebecca Skrifvars Marriage & Family Therapist · Seattle, WA NPI 1477882348 Melissa Reid Clinical Psychologist · Seattle, WA NPI 1932490448 Emily Gassert Mental Health Counselor · Seattle, WA NPI 1619396363 Katherine Oehlberg Psychologist · Seattle, WA NPI 1437566148 Sae-Jin Kim Psychologist · Seattle, WA NPI 1528461126 Jasper Berg Clinical Psychologist · Seattle, WA NPI 1447643911

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-23.