Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Oliver D Gilliam, M.D.

Gastroenterology Physician in South Bend, IN · enumerated 2005 · practices at Michiana Gastroenterology, Inc.

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

National Provider Identifier

1497759765

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Registry record

Entity type Individual (Type 1)

Name Dr. Oliver D Gilliam

Credential M.D.

Sex Male

Practice address 17501 Generations Dr, South Bend, IN, 46635

Phone (574) 234-0049

Fax (574) 251-2861

Enumeration date Jun 2, 2005

Last updated in NPPES Jan 21, 2011

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 01035882A (IN) 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
100090510	Medicaid	IN	-
2738533002	Other	IN	CIGNA
000000084427	Other	IN	ANTHEM
4667992	Other	IN	AETNA
100010837	Other	IN	RAILROAD MEDICARE

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

Where does Oliver Gilliam practice?

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

What is the NPI number for Oliver Gilliam?

The National Provider Identifier (NPI) for Oliver Gilliam is 1497759765, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-21.