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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Weiming Ryan Yan, M.D.

Gastroenterology Physician in Frederick, MD · enumerated 2008 · practices at Frederick Gastroenterology Associates PA.

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

National Provider Identifier

1851552624

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Registry record

Entity type Individual (Type 1)
Name Weiming Ryan Yan
Credential M.D.
Sex Male
Practice address Frederick, MD, 21704
Phone (301) 695-6800
Fax (301) 695-6891
Enumeration date Jun 24, 2008
Last updated in NPPES Nov 7, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License D0072237 (MD) Primary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D72237 (MD) Secondary
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.

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Frequently asked questions

What is the NPI number for Weiming Yan?
The National Provider Identifier (NPI) for Weiming Yan is 1851552624, a Type 1 (individual) record in the CMS NPPES registry.
Where does Weiming Yan practice?
The practice location on file with NPPES is in Frederick, MD. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-07.