Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Peter John Holewinski

Specialist in Santa Rosa, CA · enumerated 2016 · practices at Pine Flat Ranch, Inc..

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

National Provider Identifier

1972053114

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Registry record

Entity type Individual (Type 1)

Name Mr. Peter John Holewinski

Sex Male

Practice address 170 Farmers Ln Ste 11, Santa Rosa, CA, 95405

Phone (707) 843-3851

Fax (707) 595-3227

Enumeration date Oct 12, 2016

Last updated in NPPES Oct 12, 2016

Taxonomy & licenses

174400000X Specialist Other Service Providers · License HCO494700016 (CA) 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

What is the NPI number for Peter Holewinski?

The National Provider Identifier (NPI) for Peter Holewinski is 1972053114, a Type 1 (individual) record in the CMS NPPES registry.

Where does Peter Holewinski practice?

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

Other providers at this practice address

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Pine Flat Ranch, Inc. In Home Supportive Care Agency · Santa Rosa, CA NPI 1396295531

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-12.