NPI Portal NPI Lookup & Verification

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

Mr. David Francis Timmer, M.S.W.

Clinical Social Worker in Hales Corners, WI · enumerated 2006.

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

National Provider Identifier

1639286552

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Registry record

Entity type Individual (Type 1)
Name Mr. David Francis Timmer
Credential M.S.W.
Sex Male
Practice address Hales Corners, WI, 53130
Phone (414) 529-2591
Fax (414) 529-2669
Enumeration date Aug 24, 2006
Last updated in NPPES Sep 11, 2025

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1722 123 (WI) Primary
106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 284 124 (WI) Secondary

Other identifiers

Identifier Type State Issuer
39653900 Medicaid WI -

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

What is the NPI number for David Timmer?
The National Provider Identifier (NPI) for David Timmer is 1639286552, a Type 1 (individual) record in the CMS NPPES registry.
Where does David Timmer practice?
The practice location on file with NPPES is in Hales Corners, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.