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Dianna Yan MD PC

Specialist in Gaithersburg, MD · enumerated 2009 · authorized official Dianna Yan, Owner.

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

National Provider Identifier

1558599498

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Registry record

Entity type Organization (Type 2)
Legal business name Dianna Yan MD PC
Practice address 8909 Shady Grove Ct, Gaithersburg, MD, 20877
Phone (301) 963-0900
Fax (301) 963-9694
Enumeration date Jun 30, 2009
Last updated in NPPES Jul 7, 2009

Taxonomy & classification

174400000X Specialist Other Service Providers · License D43385 (MD) Primary

Authorized official

Name Dianna Yan
Title Owner
Phone (301) 963-0900

Other identifiers

Identifier Type State Issuer
755631400 Medicaid MD -
133049 Other MD MEDICARE PTAN

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 is the NPI number for Dianna Yan MD PC?
The NPI for Dianna Yan MD PC is 1558599498, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Dianna Yan MD PC?
NPPES lists Dianna Yan (Owner) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-07-07.