Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joseph E Hornyak IV, MD

Physical Medicine & Rehabilitation Physician in Ann Arbor, MI · enumerated 2006.

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

National Provider Identifier

1629150503

Verified

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Registry record

Entity type Individual (Type 1)

Name Joseph E Hornyak IV

Credential MD

Sex Male

Practice address 2205 Commonwealth Blvd, Ann Arbor, MI, 48105

Phone (734) 936-7175

Enumeration date Oct 19, 2006

Last updated in NPPES Jan 6, 2020

Taxonomy & licenses

2081P0004X Spinal Cord Injury Medicine Physician Allopathic & Osteopathic Physicians · License 4301064809 (MI) Secondary

208100000X Physical Medicine & Rehabilitation Physician Allopathic & Osteopathic Physicians · License 4301064809 (MI) Primary

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

Other identifiers

Identifier	Type	State	Issuer
3289413	Medicaid	MI	-

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 Joseph Hornyak?

Joseph Hornyak is registered in NPPES with the primary taxonomy of Physical Medicine & Rehabilitation Physician. 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 2020-01-06.