Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Diane Si-Si Wu, MD

Psychiatry Physician in Oakland, CA · enumerated 2016.

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

National Provider Identifier

1033572599

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Registry record

Entity type Individual (Type 1)

Name Diane Si-Si Wu

Credential MD

Sex Female

Practice address 2940 Summit St Ste 2d, Oakland, CA, 94609

Phone (650) 600-9234

Enumeration date Apr 1, 2016

Last updated in NPPES Jan 26, 2024

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License A150998 (CA) Primary

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Diane Wu?

Diane Wu is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-26.