Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. May Lee Yong, M.D.

Diagnostic Radiology Physician in Menlo Park, CA · enumerated 2006 · practices at San Mateo Medical Center.

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

National Provider Identifier

1770515694

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Registry record

Entity type Individual (Type 1)

Name Dr. May Lee Yong

Credential M.D.

Sex Female

Practice address 795 Willow Rd Bldg 334, Menlo Park, CA, 94025

Phone (877) 780-5559

Enumeration date Jul 7, 2006

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License A94589 (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
00A945890	Medicaid	CA	-

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

How do I verify May Yong's NPI record?

Cross-check NPI 1770515694 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1770515694 active?

Yes, as of the latest NPPES snapshot, NPI 1770515694 is active (record last updated 2018-03-17).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-03-17.