Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Keith John Kowalczyk, MD

Urology Physician in Washington, DC · enumerated 2008.

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

National Provider Identifier

1134370182

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Registry record

Entity type Individual (Type 1)

Name Dr. Keith John Kowalczyk

Credential MD

Sex Male

Practice address 3800 Reservoir Rd Nw, Department of Urology, 4phc, Washington, DC, 20007

Phone (202) 444-4922

Fax (877) 625-1478

Enumeration date Oct 8, 2008

Last updated in NPPES Jul 27, 2020

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License MD040082 (DC) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208800000X Urology Physician Allopathic & Osteopathic Physicians · License D72603 (MD) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Keith Kowalczyk?

Keith Kowalczyk 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.

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 2020-07-27.