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

Dr. Patrick Michael O'Leary, D.O.

General Practice Physician in Mansfield, OH · enumerated 2015.

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

National Provider Identifier

1164818084

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Registry record

Entity type Individual (Type 1)

Name Dr. Patrick Michael O'Leary

Credential D.O.

Sex Male

Practice address Mansfield, OH, 44906

Phone (833) 510-4357

Enumeration date Apr 7, 2015

Last updated in NPPES Nov 11, 2025

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

Taxonomy & licenses

2083A0300X Addiction Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License 34.013158 (OH) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 34.013158 (OH) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

What is the NPI number for Patrick O'Leary?

The National Provider Identifier (NPI) for Patrick O'Leary is 1164818084, a Type 1 (individual) record in the CMS NPPES registry.

Where does Patrick O'Leary practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-11.