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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. David Y. Tsai, M.D.

Hospitalist Physician in Mountain View, CA · enumerated 2012.

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

National Provider Identifier

1053683334

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Registry record

Entity type Individual (Type 1)
Name Dr. David Y. Tsai
Credential M.D.
Sex Male
Practice address 701 E El Camino Real, Mountain View, CA, 94040
Phone (650) 934-7000
Enumeration date Feb 2, 2012
Last updated in NPPES Feb 25, 2021

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A120477 (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
112703 Other CA SID # 112703

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

How do I verify David Tsai's NPI record?
Cross-check NPI 1053683334 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1053683334 active?
Yes, as of the latest NPPES snapshot, NPI 1053683334 is active (record last updated 2021-02-25).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-25.