WARNER PENG MD
NPI 1154584704
Internal Medicine - Hematology & Oncology in Oxnard, CA
About Warner Peng Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WARNER PENG MD (NPI 1154584704) is an individual hematology & oncology provider in Oxnard, California, licensed in California (C167982) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS and is a graduate of University Of Kansas School Of Med (kc/wich/sal) (2008).
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Warner Peng Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Warner Peng reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Santa Barbara, CA 93105
- Reassigned Medicare billing, California enrollment
- 403 clinicians in this Medicare group
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Austin J Ma MD A Professional Corporation
- 16 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93030 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Warner Peng's NPI number?
The NPI number for Warner Peng is 1154584704. It was assigned to this individual provider in the NPPES registry on July 3, 2008.
Where is Warner Peng located?
Warner Peng practices at 1851 Lombard St Ste 105, Oxnard, CA 93030. The listed phone number is (805) 485-7232.
What is Warner Peng's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Warner Peng enrolled in Medicare?
Yes. Warner Peng is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Warner Peng's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Warner Peng reassigns Medicare benefits to 2 organizations: Sansum Clinic (Santa Barbara, CA) and Austin J Ma, M.D., A Professional Corporation (Los Angeles, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Warner Peng's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Warner Peng was last updated on December 23, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Warner Peng, MD · NPI 1154584704
Hematology & Oncology physician in Oxnard, California. Individual provider, active in the CMS NPPES registry since July 3, 2008.
## Identity
- **NPI:** 1154584704 (Entity type: Individual)
- **Enumerated:** July 3, 2008
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** C167982 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1851 LOMBARD ST STE 105, Oxnard, CA 93030-8231
- **Phone:** (805) 485-7232
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Sansum Clinic (NPI 1932121514, Santa Barbara, CA); Austin J Ma, M.D., A Professional Corporation (NPI 1174685846, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Kansas School Of Med, class of 2008
## Record status
- **NPPES last updated:** December 23, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1154584704) · Data from the CMS NPPES public registry.