Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Leo B Semkiw, M.D.

Specialist in San Jose, CA · enumerated 2006.

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

National Provider Identifier

1215949110

Verified

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Registry record

Entity type Individual (Type 1)

Name Leo B Semkiw

Credential M.D.

Sex Male

Practice address 2430 Samaritan Dr, San Jose, CA, 95124

Phone (408) 371-5300

Fax (408) 371-6387

Enumeration date Aug 12, 2006

Last updated in NPPES Nov 14, 2008

Taxonomy & licenses

174400000X Specialist Other Service Providers · License G56561 (CA) 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
1245247196	Other	CA	GROUP NPI NUMBER
030493774	Other	CA	TAX INDENTIFICATION 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.

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Frequently asked questions

What specialty is Leo Semkiw?

Leo Semkiw is registered in NPPES with the primary taxonomy of Specialist. 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 2008-11-14.