Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Hiram Stephen Williams, M.D.

Pediatrics Physician in Okemos, MI · enumerated 2006.

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

National Provider Identifier

1538191259

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Registry record

Entity type Individual (Type 1)

Name Dr. Hiram Stephen Williams

Credential M.D.

Sex Male

Practice address 1600 W Grand River Ave, Okemos, MI, 48864

Phone (517) 349-6560

Fax (517) 349-5796

Enumeration date Jul 6, 2006

Last updated in NPPES Aug 22, 2016

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 4301059122 (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
4441219	Medicaid	MI	-
1538191259	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1538191259 active?

Yes, as of the latest NPPES snapshot, NPI 1538191259 is active (record last updated 2016-08-22).

How do I verify Hiram Williams's NPI record?

Cross-check NPI 1538191259 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-22.