Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John L Kniaz, DO

Gastroenterology Physician in Munster, IN · enumerated 2006 · practices at Dalal Medical Corporation.

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

National Provider Identifier

1659470110

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Registry record

Entity type Individual (Type 1)

Name John L Kniaz

Credential DO

Sex Male

Practice address 9410 Calumet Ave Ste 401, Munster, IN, 46321

Phone (219) 922-4900

Fax (219) 836-9922

Enumeration date Sep 21, 2006

Last updated in NPPES Aug 13, 2024

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 02000771 (IN) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
628340	Other	IN	MEDICARE PTAN
100354640A	Medicaid	IN	-
211956	Other	IL	MEDICARE PTAN

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 specialty is John Kniaz?

John Kniaz 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.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-13.