Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael S Leininger, PA PHYSICIAN ASST

Physician Assistant in Joliet, IL · enumerated 2006.

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

National Provider Identifier

1235147257

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Registry record

Entity type Individual (Type 1)

Name Michael S Leininger

Credential PA PHYSICIAN ASST

Sex Male

Practice address 333 N Madison St, Joliet, IL, 60435

Phone (815) 725-7133

Fax (815) 773-7859

Enumeration date Aug 4, 2006

Last updated in NPPES Feb 14, 2020

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085002266 (IL) Primary

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Michael Leininger?

Michael Leininger is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-02-14.