Warner Peng, MD

Warner Peng is a Hematology & Oncology Physician provider (Internal Medicine) practicing in Oxnard, CA, registered in the NPPES registry with NPI 1154584704 since 2008. The credential MD stands for Doctor of Medicine.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1154584704
Entity type	Individual (Type 1)
Name	Warner Peng
Credential	MD
Sex	Male
Practice address	Oxnard, CA, 93030
Phone	8054857232
Enumeration date	2008-07-03
Last updated in NPPES	2021-12-23

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
207RH0003X	Hematology & Oncology Physician	Primary	C167982	CA

MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Copy-ready billing details

Provider: Warner Peng, MD
NPI: 1154584704
Taxonomy: 207RH0003X (Hematology & Oncology Physician)
Address: Oxnard, CA, 93030

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1295915825	Barbara Bellfield	Individual	Family Nurse Practitioner	Oxnard, CA

Verify this record

Cross-check NPI 1154584704 against the authoritative CMS record: view Warner Peng on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

What specialty is Warner Peng?

Warner Peng is registered in NPPES with the primary taxonomy of Hematology & Oncology 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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-12-23.