Oliver S. Eng, M.D.
Surgical Oncology Physician · Orange, CA
Oliver S. Eng, M.D. is a surgical oncology physician with a practice address in Orange, California, and NPI 1245556406, issued on Apr 13, 2010. Check the license (California A140751, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Oliver S. Eng
- Credential
- M.D.
- Primary taxonomy
- Surgical Oncology Physician 2086X0206X
- License numbers
- A140751 CA
036146817 IL
Self-reported in NPPES; status is on the state search - Practice location
- 101 The City Dr S, Orange, CA 92868
- Phone
- (714) 880-7812
- Enumerated
- Apr 13, 2010
- Record last updated
- Nov 14, 2022
- Medicare enrollment
- Enrolled (PECOS I20211213001011); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest surgical oncology physician records → All 250 in California → Look up another NPI →
Also registered at 101 The City Dr S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Danny Abad, PAPhysician Assistant1477158673
- Edward AbaradoStudent in an Organized Health Care Education/Training Program1912855198
- Nagina Abdiani, DOGeriatric Medicine (Family Medicine) Physician1518543271
- Mariam Abdul-Latif, M.D.Pediatrics Physician1538418884
- Eric AbelloOtolaryngology Physician1922566215
- Brandon Abeyta, MDAnesthesiology Physician1841291804
Verify Oliver S. Eng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A140751Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $1,352.31
7 payments; by number, the most common kind was food and beverage; the largest payer was Applied Medical Resources Corporation. The 1,132 providers of this specialty with any payment received $4,224.74 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
- University Surgeons OF Orange A Medical GroupOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Oliver S. Eng among 250 surgical oncology physician records in California
Oliver S. Eng, M.D. is one of 250 surgical oncology physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 64% of them.
- NPI issued2010 · 64% of these records are older, 33% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2010 · median 2004 among the 184 with a school on file
- Record last updated2022 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086X0206X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgical Oncology Physician providers in California
There are 250 surgical oncology physician records in California.
All 250 in California → Every provider in Orange → Surgical Oncology Physician nationwide →
The 8 surgical oncology physician records with the nearest ZIP codes
- Valentina BonevOrange, CA 928681326312075
- John A Butler, MDOrange, CA 928681902986094
- James Jakowatz, MDOrange, CA 928681649225384
- Karen T Lane, MDOrange, CA 928681316027444
- Erin Lin, D.O.Orange, CA 928681780983411
- Alexandra Lopez-Aguiar, M.D.Orange, CA 928681477972040
- Melissa Mao, MDOrange, CA 928681245594498
- Thuy Tran, M.D.Orange, CA 928681851736938
Common questions
What is Oliver S. Eng, M.D.'s NPI number?
Oliver S. Eng, M.D.'s National Provider Identifier (NPI) is 1245556406, issued on Apr 13, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Oliver S. Eng, M.D. located?
The NPPES record lists a practice address at 101 The City Dr S, Orange, CA, 92868. Phone: (714) 880-7812. Providers update this record themselves, so call before visiting.
How can I verify Oliver S. Eng, M.D.'s license?
NPPES lists California license number A140751, 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.
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.