Mark Ostrowski, PSY.D.
NPI 1700022324 · Clinical Psychologist · Stamford, CT
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ostrowski, PSY.D. is a Clinical Psychologist provider in Stamford, CT (NPI 1700022324).
Provider details
- NPI number
- 1700022324
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 002433 (CT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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
- 2009-01-02
- Last updated
- 2012-05-16
Frequently asked questions
- What is Mark Ostrowski's NPI number?
- Mark Ostrowski's National Provider Identifier (NPI) is 1700022324, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ostrowski's specialty?
- Mark Ostrowski is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mark Ostrowski located?
- Mark Ostrowski's practice location on file with NPPES is 999 Summer St, Stamford, CT 06905-5546.
- What is Mark Ostrowski's phone number?
- The practice phone number listed in the NPPES registry for Mark Ostrowski is (203) 967-4995.
- Does Mark Ostrowski accept Medicare?
- Mark Ostrowski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ostrowski's NPI active?
- Yes — Mark Ostrowski's NPI (1700022324) is active in the NPPES registry as of the last update on 2012-05-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.