Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas F. Ignaczak, M.D.

Internal Medicine Physician in Battle Creek, MI · enumerated 2006.

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

National Provider Identifier

1053480947

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas F. Ignaczak

Credential M.D.

Sex Male

Practice address 363 Fremont St Ste 203, Battle Creek, MI, 49017

Phone (269) 969-6123

Fax (269) 969-6122

Enumeration date Nov 7, 2006

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License TI035364 (MI) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 4301035364 (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
1101301121	Other	MI	BCBS
3199719	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 Thomas Ignaczak?

Thomas Ignaczak is registered in NPPES with the primary taxonomy of Internal Medicine 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 2018-03-17.