John Williams III, M.D.
NPI 1205819133 · Maternal & Fetal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Williams III, M.D. is a Maternal & Fetal Medicine Physician provider in Los Angeles, CA (NPI 1205819133).
Provider details
- NPI number
- 1205819133
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G39794 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-23
- Last updated
- 2013-05-17
Frequently asked questions
- What is John Williams III's NPI number?
- John Williams III's National Provider Identifier (NPI) is 1205819133, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Williams III's specialty?
- John Williams III is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Williams III located?
- John Williams III's practice location on file with NPPES is 8700 Beverly Blvd., Los Angeles, CA 90048-1865.
- What is John Williams III's phone number?
- The practice phone number listed in the NPPES registry for John Williams III is (310) 423-5000.
- Does John Williams III accept Medicare?
- John Williams III is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Williams III's NPI active?
- Yes — John Williams III's NPI (1205819133) is active in the NPPES registry as of the last update on 2013-05-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.