John Marshall, M.D.
NPI 1841344538 · Obstetrics & Gynecology Physician · Torrance, CA
John Marshall, M.D. is a Obstetrics & Gynecology Physician provider in Torrance, CA (NPI 1841344538).
Provider details
- NPI number
- 1841344538
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A18594 (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
19 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
- 2007-01-22
- Last updated
- 2007-07-09
Frequently asked questions
- What is John Marshall's NPI number?
- John Marshall's National Provider Identifier (NPI) is 1841344538, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Marshall's specialty?
- John Marshall is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is John Marshall located?
- John Marshall's practice location on file with NPPES is 1000 W Carson St, Torrance, CA 90502-2004.
- What is John Marshall's phone number?
- The practice phone number listed in the NPPES registry for John Marshall is (310) 222-3591.
- Is John Marshall's NPI active?
- Yes — John Marshall's NPI (1841344538) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.