Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jack S. Bartoszek, D.O.

Geriatric Medicine (Family Medicine) Physician in Mishawaka, IN · enumerated 2005.

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

National Provider Identifier

1093714818

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Registry record

Entity type Individual (Type 1)

Name Dr. Jack S. Bartoszek

Credential D.O.

Sex Male

Practice address 615 Fulmer Rd, Mishawaka, IN, 46544

Phone (574) 252-3085

Fax (574) 252-5906

Enumeration date Jul 14, 2005

Last updated in NPPES Sep 20, 2013

Taxonomy & licenses

207QG0300X Geriatric Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 02001105 (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
100335800A	Medicaid	IN	-
OA41009	Other	MI	BCBSM
000000109340	Other	IN	ANTHEM NUMBER

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 Jack Bartoszek?

Jack Bartoszek is registered in NPPES with the primary taxonomy of Geriatric Medicine (Family Medicine) 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.

Other providers at this practice address

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V Durga Madhusudana Rao Orthopaedic Surgery Physician · Mishawaka, IN NPI 1487682167 Robert B Mcclure Do Family Medicine Physician · Mishawaka, IN NPI 1467679191 Michele Smith Family Nurse Practitioner · Mishawaka, IN NPI 1124215058 I-Spine, LLC Orthopaedic Surgery Physician · Mishawaka, IN NPI 1255506309 Linda Holcomb Family Nurse Practitioner · Mishawaka, IN NPI 1679733208 Michiana Primary Care LLC Family Medicine Physician · Mishawaka, IN NPI 1639480643 Katherine Guy Mental Health Counselor · Mishawaka, IN NPI 1669764965

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-09-20.