Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas William Zastrow, D.C.

Chiropractor in Greenfield, WI · enumerated 2006.

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

National Provider Identifier

1285700773

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas William Zastrow

Credential D.C.

Sex Male

Practice address 4811 S 76th St, Suite 204, Greenfield, WI, 53220

Phone (414) 281-5266

Fax (414) 281-9772

Enumeration date Nov 27, 2006

Last updated in NPPES Mar 20, 2014

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 1471 (WI) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Thomas Zastrow?

Thomas Zastrow is registered in NPPES with the primary taxonomy of Chiropractor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-03-20.