Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jan Ryszkowski, M.D.

Nuclear Medicine Physician in Little Rock, AR · enumerated 2008.

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

National Provider Identifier

1134304512

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Registry record

Entity type Individual (Type 1)

Name Dr. Jan Ryszkowski

Credential M.D.

Sex Male

Practice address 316 Commentry Way, Little Rock, AR, 72223

Phone (501) 352-7043

Enumeration date Jan 4, 2008

Last updated in NPPES Sep 19, 2025

Taxonomy & licenses

207UN0902X Nuclear Imaging & Therapy Physician Allopathic & Osteopathic Physicians · License 4301091356 (MI) Secondary

207UN0901X Nuclear Cardiology Physician Allopathic & Osteopathic Physicians · License 4301091356 (MI) Secondary

207UN0903X In Vivo & In Vitro Nuclear Medicine Physician Allopathic & Osteopathic Physicians · License 4301091356 (MI) Secondary

207U00000X Nuclear Medicine Physician Allopathic & Osteopathic Physicians · License E-5892 (AR) Primary

207U00000X Nuclear Medicine Physician Allopathic & Osteopathic Physicians · License 4301091356 (MI) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 4301091356 (MI) Secondary

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
174688001	Medicaid	AR	-

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 Jan Ryszkowski?

Jan Ryszkowski is registered in NPPES with the primary taxonomy of Nuclear 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-19.