Quick answers
- Where does Matthew R. Williams see patients?
- Medicare's clinician data lists 1 practice location in San Diego, CA. Call before your visit to confirm the address.
- What is Matthew R. Williams's specialty?
- Medicare lists Pediatric Medicine as the primary specialty, and also Cardiovascular Disease (Cardiology).
- Does Matthew R. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew R. 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 Matthew R. Williams?
- (858) 576-1700, as listed in official Medicare / NPI Registry data.
- What is Matthew R. Williams's NPI number?
- 1831423250. 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 Matthew R. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 3020 Children'S WaySan Diego, CA 92123 (858) 576‑1700
Group practices
Medicare enrollment lists Matthew R. Williams as a member of this group (CMS data updated 2026-10-02).
- Rady Children's Hospital San Diego169 clinicians in the group
Specialties
Other pediatricians in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Clinician information
| Medical school | University Of Colorado School Of Medicine, Denver |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831423250 |
| 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