Quick answers
- Which hospitals does Justin P. McWilliams work at?
- Medicare's official clinician data lists Justin P. McWilliams at 2 hospitals: Ronald Reagan UCLA Medical Center and Santa Monica - UCLA Medical Center & Orthopaedic Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Justin P. McWilliams see patients?
- Medicare's clinician data lists 7 practice locations, including Compton, CA, Los Angeles, CA and Manhattan Beach, CA. Call before your visit to confirm the address.
- What is Justin P. McWilliams's specialty?
- Medicare lists Interventional Radiology as the primary specialty, and also Diagnostic Radiology.
- Does Justin P. McWilliams accept Medicare assignment?
- Yes. Medicare's clinician data says Justin P. McWilliams 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.
- Does Justin P. McWilliams offer telehealth?
- Medicare's clinician data says Justin P. McWilliams offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Justin P. McWilliams?
- (424) 338-8790, as listed in official Medicare / NPI Registry data.
- What is Justin P. McWilliams's NPI number?
- 1437292331. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Justin P. McWilliams works
Medicare's Facility Affiliation Data lists Justin P. McWilliams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050262
- Santa Monica - UCLA Medical Center & Orthopaedic HospitalSanta Monica, CA · Acute Care Hospital · CCN 050112
Practice locations
Addresses where Justin P. McWilliams is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 135 E Compton BlvdCompton, CA 90220 (424) 338‑8790
- 1680 E 120th StLos Angeles, CA 90059
- 2200 N Sepulveda BlvdManhattan Beach, CA 90266 (310) 802‑0200
- 26585 Agoura Rd, Suite 210Calabasas, CA 91302 (818) 878‑0028
- 300 UCLA Medical Plz, Suite B130Los Angeles, CA 90095 (310) 206‑0456
Group practices
Medicare enrollment lists Justin P. McWilliams as a member of these groups (CMS data updated 2026-10-02).
- Martin Luther King Jr Community Medical Foundation206 clinicians in the group
- UCLA Radiology Medical Group202 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Diagnostic Radiologyalso
Other interventional radiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1437292331 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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