Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dennis Y. Wu, MD

Nephrology Physician in Modesto, CA · enumerated 2007.

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

National Provider Identifier

1114063716

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Registry record

Entity type Individual (Type 1)

Name Dennis Y. Wu

Credential MD

Sex Male

Practice address 4601 Dale Rd, Modesto, CA, 95356

Phone (209) 557-1000

Enumeration date Jan 30, 2007

Last updated in NPPES Dec 20, 2021

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License A77652 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Dennis Wu?

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

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-20.