Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David Yoonsuk Oh

Hematology & Oncology Physician in San Francisco, CA · enumerated 2011.

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

National Provider Identifier

1891084349

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Registry record

Entity type Individual (Type 1)

Name David Yoonsuk Oh

Sex Male

Practice address 400 Parnassus Ave Fl 4, Ucsf, San Francisco, CA, 94143

Phone (415) 353-2421

Enumeration date Apr 6, 2011

Last updated in NPPES Nov 14, 2019

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License A123255 (CA) Primary

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

Is NPI 1891084349 active?

Yes, as of the latest NPPES snapshot, NPI 1891084349 is active (record last updated 2019-11-14).

How do I verify David Oh's NPI record?

Cross-check NPI 1891084349 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-11-14.