Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter David Holzwarth, MD

Pediatrics Physician in Neenah, WI · enumerated 2006.

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

National Provider Identifier

1629001912

Verified

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Registry record

Entity type Individual (Type 1)

Name Peter David Holzwarth

Credential MD

Sex Male

Practice address 120 Second Street, Neenah, WI, 54956

Phone (920) 969-7900

Fax (920) 969-7979

Enumeration date Jul 9, 2006

Last updated in NPPES Jan 14, 2019

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 35954 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1629001912	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Peter Holzwarth?

The National Provider Identifier (NPI) for Peter Holzwarth is 1629001912, a Type 1 (individual) record in the CMS NPPES registry.

Where does Peter Holzwarth practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-01-14.