Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Leonard M. Mattes M.D., P.C.

Q: What is the NPI number for Leonard M. Mattes M.D., P.C.?

The NPI for Leonard M. Mattes M.D., P.C. is 1023395654, a Type 2 (organization) record in the CMS NPPES registry.

Cardiovascular Disease Physician in New York, NY · enumerated 2011 · authorized official Leonard Mattes, Owner.

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

National Provider Identifier

1023395654

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Registry record

Entity type Organization (Type 2)

Legal business name Leonard M. Mattes M.D., P.C.

Practice address 1199 Park Ave, Suite 1f, New York, NY, 10128

Phone (212) 876-7045

Fax (212) 722-3286

Enumeration date Nov 10, 2011

Last updated in NPPES Nov 10, 2011

Taxonomy & classification

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 093836 (NY) Primary

Authorized official

Name Leonard Mattes

Title Owner

Phone (212) 876-7045

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 Leonard M. Mattes M.D., P.C.?

The NPI for Leonard M. Mattes M.D., P.C. is 1023395654, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Leonard M. Mattes M.D., P.C.?

NPPES lists Leonard Mattes (Owner) as the authorized official for this organization.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-10.