Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Genadij Sienkiewicz, M.D.

Dermatology Physician in Vestal, NY · enumerated 2006.

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

National Provider Identifier

1821036740

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Registry record

Entity type Individual (Type 1)

Name Dr. Genadij Sienkiewicz

Credential M.D.

Sex Male

Practice address 200 Front St, Vestal, NY, 13850

Phone (607) 658-1003

Fax (607) 658-1006

Enumeration date Jun 3, 2006

Last updated in NPPES Nov 19, 2011

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 131991 (NY) 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
00685727	Medicaid	NY	-

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 Genadij Sienkiewicz?

Genadij Sienkiewicz is registered in NPPES with the primary taxonomy of Dermatology 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 2011-11-19.