Sidney Marshak, M.D.
NPI 1790851780 · Family Medicine Physician · Los Angeles, CA
Sidney Marshak, M.D. is a Family Medicine Physician provider in Los Angeles, CA (NPI 1790851780).
Provider details
- NPI number
- 1790851780
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A29098 (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
- 2006-11-28
- Last updated
- 2007-07-08
Frequently asked questions
- What is Sidney Marshak's NPI number?
- Sidney Marshak's National Provider Identifier (NPI) is 1790851780, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sidney Marshak's specialty?
- Sidney Marshak is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sidney Marshak located?
- Sidney Marshak's practice location on file with NPPES is 3484 E 1st St, Los Angeles, CA 90063-2946.
- What is Sidney Marshak's phone number?
- The practice phone number listed in the NPPES registry for Sidney Marshak is (323) 268-4436.
- Is Sidney Marshak's NPI active?
- Yes — Sidney Marshak's NPI (1790851780) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.