Quick answers
- Where does Derek E. Go see patients?
- Medicare's clinician data lists 2 practice locations, including Ontario, CA and Los Angeles, CA. Call before your visit to confirm the address.
- What is Derek E. Go's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Derek E. Go accept Medicare assignment?
- Yes. Medicare's clinician data says Derek E. Go accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Derek E. Go?
- (909) 724-5000, as listed in official Medicare / NPI Registry data.
- What is Derek E. Go's NPI number?
- 1639639503. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Derek E. Go is enrolled with Medicare (CMS data updated 2026-10-02).
- 2295 S Vineyard AveOntario, CA 91761 (909) 724‑5000
- 4950 W Sunset BlvdLos Angeles, CA 90027 (323) 783‑4011
Group practices
Medicare enrollment lists Derek E. Go as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Ontario
Clinicians with the same Medicare primary specialty in Ontario, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639639503 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians