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Robert Ostroff, M.D.
NPI 1912109240 · Internal Medicine Physician · Petaluma, CA
Robert Ostroff, M.D. is a Internal Medicine Physician provider in Petaluma, CA (NPI 1912109240).
Provider details
- NPI number
- 1912109240
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G23046 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(89/100 index)
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
400 N Mcdowell Blvd
Petaluma, CA 94954-2339
Phone: (707) 778-1111
Street-level locationGet directions
Mailing address
1310 Commerce St
Petaluma, CA 94954-1469
Registry dates
- Enumerated
- 2007-05-31
- Last updated
- 2007-07-24
Frequently asked questions
- What is Robert Ostroff's NPI number?
- Robert Ostroff's National Provider Identifier (NPI) is 1912109240, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Ostroff's specialty?
- Robert Ostroff is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Ostroff located?
- Robert Ostroff's practice location on file with NPPES is 400 N Mcdowell Blvd, Petaluma, CA 94954-2339.
- What is Robert Ostroff's phone number?
- The practice phone number listed in the NPPES registry for Robert Ostroff is (707) 778-1111.
- Is Robert Ostroff's NPI active?
- Yes — Robert Ostroff's NPI (1912109240) is active in the NPPES registry as of the last update on 2007-07-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.