Warner Peng, MD
Hematology & Oncology Physician · Oxnard, CA
Warner Peng, MD is a hematology & oncology physician with a practice address in Oxnard, California, and NPI 1154584704, issued on Jul 3, 2008. Check the license (California C167982, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Warner Peng
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- C167982 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1851 Lombard St Ste 105, Oxnard, CA 93030
- Phone
- (805) 485-7232
- Enumerated
- Jul 3, 2008
- Record last updated
- Dec 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200331003452); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 1851 Lombard St Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Barbara Bellfield, NPFamily Nurse Practitioner1295915825
Verify Warner Peng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C167982Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.1 times the Medicare Part D claims of the average hematology & oncology physician in 2024
2,675 Medicare Part D claims for 402 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims. 59 claims were for opioids.
Most prescribed
- Anastrozole181 claims
- Procrit110 claims
- Abiraterone Acetate103 claims
- Dexamethasone Sodium Phosphate101 claims
- Prednisone86 claims
- Ondansetron Hcl82 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $4,377.96
192 payments; by number, the most common kind was food and beverage; the largest payer was Celgene Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Austin J MA MD A Professional CorporationOxnard, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
Other hematology & oncology physician records in California
- Mark Abate, M.D.Santa Barbara, CA1588778674
- Iman Abdalla, MDLos Angeles, CA1730248311
- Haifaa Abdulhaq, MDFresno, CA1508024647
- Nihal Abdulla, MDLos Alamitos, CA1750585345
- Mehrad Abedi, M.D.Sacramento, CA1467459222
- Oyewale Abidoye, M.D.La Jolla, CA1790841815
- Mohammed Abu Zaanona, MDSanta Barbara, CA1922591197
- Mohamad Adada, M.D., PHDRoseville, CA1528590734
- Jesse Adams, MDSacramento, CA1851479554
- Thompson Adams, MDSanta Monica, CA1407880891
Common questions
What is Warner Peng, MD's NPI number?
Warner Peng, MD's National Provider Identifier (NPI) is 1154584704, issued on Jul 3, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Warner Peng, MD located?
The NPPES record lists a practice address at 1851 Lombard St Ste 105, Oxnard, CA, 93030. Phone: (805) 485-7232. Providers update this record themselves, so call before visiting.
How can I verify Warner Peng, MD's license?
NPPES lists California license number C167982, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Warner Peng, MD prescribe under Medicare Part D?
In 2024, Warner Peng, MD had 2,675 Medicare Part D claims for 402 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.