Mark Greenstadt, M.D., Inc.
NPI 1770635120 · Internal Medicine Physician · Northridge, CA
Mark Greenstadt, M.D., Inc. is a Internal Medicine Physician organization in Northridge, CA (NPI 1770635120).
Provider details
- NPI number
- 1770635120
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Greenstadt, President(818) 717-3021
- License
- G35141 (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
- 2007-01-17
- Last updated
- 2020-08-22
Frequently asked questions
- What is Mark Greenstadt, M.D., Inc.'s NPI number?
- Mark Greenstadt, M.D., Inc.'s National Provider Identifier (NPI) is 1770635120, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark Greenstadt, M.D., Inc.?
- Mark Greenstadt, M.D., Inc. is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Greenstadt, M.D., Inc. located?
- Mark Greenstadt, M.D., Inc.'s practice location on file with NPPES is 18350 Roscoe Blvd, Northridge, CA 91325-4109.
- What is Mark Greenstadt, M.D., Inc.'s phone number?
- The practice phone number listed in the NPPES registry for Mark Greenstadt, M.D., Inc. is (818) 717-3021.
- Who is the authorized official for Mark Greenstadt, M.D., Inc.?
- The authorized official listed on Mark Greenstadt, M.D., Inc.'s NPPES record is Mark Greenstadt, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark Greenstadt, M.D., Inc.'s NPI active?
- Yes — Mark Greenstadt, M.D., Inc.'s NPI (1770635120) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.