Oliver Eng, M.D.
NPI 1245556406 · Surgical Oncology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Surgical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oliver Eng, M.D. is a Surgical Oncology Physician provider in Orange, CA (NPI 1245556406).
Provider details
- NPI number
- 1245556406
- Entity type
- Individual
- Primary specialty
- Surgical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036146817 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
16 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,352 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 333 City Blvd W Ste 1600Orange, CA 92868-5903Phone: (714) 456-6262Fax: (714) 456-6377
Registry dates
- Enumerated
- 2010-04-13
- Last updated
- 2022-11-14
- Certified
- 2022-11-14
Frequently asked questions
- What is Oliver Eng's NPI number?
- Oliver Eng's National Provider Identifier (NPI) is 1245556406, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oliver Eng's specialty?
- Oliver Eng is listed in the NPPES registry with a primary specialty of Surgical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Oliver Eng located?
- Oliver Eng's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Oliver Eng's phone number?
- The practice phone number listed in the NPPES registry for Oliver Eng is (714) 880-7812.
- Does Oliver Eng accept Medicare?
- Oliver Eng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oliver Eng's NPI active?
- Yes — Oliver Eng's NPI (1245556406) is active in the NPPES registry as of the last update on 2022-11-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.