Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jacek Lech Mostwin, M.D.

Urology Physician in Baltimore, MD · enumerated 2006.

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

National Provider Identifier

1487607149

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Registry record

Entity type Individual (Type 1)

Name Jacek Lech Mostwin

Credential M.D.

Sex Male

Practice address 601 N Caroline St, Baltimore, MD, 21287

Phone (410) 955-6100

Enumeration date May 17, 2006

Last updated in NPPES Feb 13, 2013

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License D21971 (MD) 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
382191900	Medicaid	MD	-

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 Jacek Mostwin?

Jacek Mostwin is registered in NPPES with the primary taxonomy of Urology 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 2013-02-13.