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

Fredric Donald Leary Jr., M.D.

Family Medicine Physician in Oak Park, IL · enumerated 2007.

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

National Provider Identifier

1255475570

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Registry record

Entity type Individual (Type 1)

Name Fredric Donald Leary Jr.

Credential M.D.

Sex Male

Practice address Oak Park, IL, 60304

Phone (708) 524-5079

Fax (303) 466-5949

Enumeration date Feb 19, 2007

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

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

The National Provider Identifier (NPI) for Fredric Leary is 1255475570, a Type 1 (individual) record in the CMS NPPES registry.

Where does Fredric Leary practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.