Quick answers
- Where does Terence Williams see patients?
- Medicare's clinician data lists 3 practice locations, including Duarte, CA and South Pasadena, CA. Call before your visit to confirm the address.
- What is Terence Williams's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Terence Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Terence Williams 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 Terence Williams?
- (626) 256-4673, as listed in official Medicare / NPI Registry data.
- What is Terence Williams's NPI number?
- 1003939133. 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 Terence Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1500 Duarte RdDuarte, CA 91010 (626) 256‑4673
- 1500 E Duarte RdDuarte, CA 91010
- 209 Fair Oaks AveSouth Pasadena, CA 91030 (626) 396‑2900
Group practices
Medicare enrollment lists Terence Williams as a member of this group (CMS data updated 2026-10-02).
- City of Hope Medical Foundation982 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Duarte
Clinicians with the same Medicare primary specialty in Duarte, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1003939133 |
| 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