Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ralf Holzer, MD

Q: What is the NPI number for Ralf Holzer?

The National Provider Identifier (NPI) for Ralf Holzer is 1629064795, a Type 1 (individual) record in the CMS NPPES registry.

Pediatric Cardiology Physician in New York, NY · enumerated 2005.

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

National Provider Identifier

1629064795

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Registry record

Entity type Individual (Type 1)

Name Ralf Holzer

Credential MD

Sex Male

Practice address 525 E 68th St, New York, NY, 10065

Phone (212) 746-3561

Enumeration date Sep 23, 2005

Last updated in NPPES Oct 15, 2018

Taxonomy & licenses

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License 35086049 (OH) Secondary

2080P0202X Pediatric Cardiology Physician Allopathic & Osteopathic Physicians · License 35086049 (OH) Secondary

2080P0202X Pediatric Cardiology Physician Allopathic & Osteopathic Physicians · License 287050 (NY) 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
HO4168321	Other	-	OHIO MEDICARE
64107337	Medicaid	KY	-
3810004595	Medicaid	WV	-
2576985	Medicaid	OH	-

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

Where does Ralf Holzer practice?

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

What is the NPI number for Ralf Holzer?

The National Provider Identifier (NPI) for Ralf Holzer is 1629064795, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-10-15.