Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Glenn Mathis, 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

1427051341

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Registry record

Entity type Individual (Type 1)

Name Dr. John Glenn Mathis

Credential M.D.

Sex Male

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

Phone (574) 234-0049

Fax (574) 251-2861

Enumeration date May 24, 2005

Last updated in NPPES Oct 4, 2010

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 01026543A (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
4359074	Other	IN	AETNA
000000084425	Other	IN	ANTHEM
100223380A	Medicaid	IN	-
2010421004	Other	IN	CIGNA
110082368	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.

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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 John Mathis?

John Mathis is registered in NPPES with the primary taxonomy of Gastroenterology 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 2010-10-04.