Quick answers
- Where does John Williams Iii see patients?
- Medicare's clinician data lists 2 practice locations, including Los Angeles, CA and West Hollywood, CA. Call before your visit to confirm the address.
- What is John Williams Iii's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does John Williams Iii accept Medicare assignment?
- Yes. Medicare's clinician data says John Williams Iii 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 John Williams Iii?
- (310) 423-5000, as listed in official Medicare / NPI Registry data.
- What is John Williams Iii's NPI number?
- 1205819133. 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 John Williams Iii is enrolled with Medicare (CMS data updated 2026-10-02).
- 444 S San Vicente BlvdLos Angeles, CA 90048 (310) 423‑5000
- 8700 Beverly BlvdWest Hollywood, CA 90048
Group practices
Medicare enrollment lists John Williams Iii as a member of this group (CMS data updated 2026-10-02).
- Cedars-Sinai Medical Center799 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1978 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1205819133 |
| 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