Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Leonard A Mazza, DC

Chiropractor in York, PA · enumerated 2006.

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

National Provider Identifier

1699719195

Verified

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Registry record

Entity type Individual (Type 1)

Name Leonard A Mazza

Credential DC

Sex Male

Practice address York, PA, 17403

Phone (717) 334-4481

Enumeration date Jun 15, 2006

Last updated in NPPES Jan 8, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License DC003389L (PA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Leonard Mazza practice?

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

What is the NPI number for Leonard Mazza?

The National Provider Identifier (NPI) for Leonard Mazza is 1699719195, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-08.