Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Ann Kosir, MD

Q: What is the NPI number for Mary Kosir?

The National Provider Identifier (NPI) for Mary Kosir is 1508803594, a Type 1 (individual) record in the CMS NPPES registry.

Surgery Physician in Detroit, MI · enumerated 2006.

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

National Provider Identifier

1508803594

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Registry record

Entity type Individual (Type 1)

Name Mary Ann Kosir

Credential MD

Sex Female

Practice address 4100 John R, Detroit, MI, 48201

Phone (800) 527-6266

Fax (313) 576-8699

Enumeration date May 31, 2006

Last updated in NPPES Aug 3, 2016

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 4301057608 (MI) 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 Mary Kosir?

The National Provider Identifier (NPI) for Mary Kosir is 1508803594, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Kosir practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-03.