Grossman and Grossman Mds a Medical Corporation
NPI 1255483525 · Obstetrics Physician · Thousand Oaks, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grossman and Grossman Mds a Medical Corporation is a Obstetrics Physician organization in Thousand Oaks, CA (NPI 1255483525).
Provider details
- NPI number
- 1255483525
- Entity type
- Organization
- Primary specialty
- Obstetrics PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Robert Grossman, President(805) 498-0240
Specialties & taxonomies
Allopathic & Osteopathic Physicians
- Internal Medicine Physician207R00000X
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
- 2026-01-16
- Certified
- 2026-01-16
Frequently asked questions
- What is Grossman and Grossman Mds a Medical Corporation's NPI number?
- Grossman and Grossman Mds a Medical Corporation's National Provider Identifier (NPI) is 1255483525, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Grossman and Grossman Mds a Medical Corporation?
- Grossman and Grossman Mds a Medical Corporation is classified in the NPPES registry as Obstetrics Physician (Allopathic & Osteopathic Physicians).
- Where is Grossman and Grossman Mds a Medical Corporation located?
- Grossman and Grossman Mds a Medical Corporation's practice location on file with NPPES is 558 N Ventu Park Rd, Thousand Oaks, CA 91320-2718.
- What is Grossman and Grossman Mds a Medical Corporation's phone number?
- The practice phone number listed in the NPPES registry for Grossman and Grossman Mds a Medical Corporation is (805) 498-0240.
- Does Grossman and Grossman Mds a Medical Corporation accept Medicare?
- Grossman and Grossman Mds a Medical Corporation is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Grossman and Grossman Mds a Medical Corporation?
- The authorized official listed on Grossman and Grossman Mds a Medical Corporation's NPPES record is Robert Grossman, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Grossman and Grossman Mds a Medical Corporation's NPI active?
- Yes — Grossman and Grossman Mds a Medical Corporation's NPI (1255483525) is active in the NPPES registry as of the last update on 2026-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.