DR. MARK OSTROWSKI PSY.D.
NPI 1700022324
Psychologist - Clinical in Stamford, CT
About Dr. Mark Ostrowski Psy.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK OSTROWSKI PSY.D. (NPI 1700022324) is an individual clinical provider in Stamford, Connecticut, licensed in Connecticut (002433) and active in the NPI registry since January 2009. He is enrolled in Medicare PECOS and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Mark Ostrowski Psy.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Mark Ostrowski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Stamford, CT 06905
- Reassigned Medicare billing, Connecticut enrollment
- Medicare enrollment name: Mark J. Ostrowski Psyd LLC
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06905 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Ostrowski's NPI number?
The NPI number for Mark Ostrowski is 1700022324. It was assigned to this individual provider in the NPPES registry on January 2, 2009.
Where is Mark Ostrowski located?
Mark Ostrowski practices at 999 Summer St Suite 200, Stamford, CT 06905. The listed phone number is (203) 967-4995.
What is Mark Ostrowski's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Mark Ostrowski enrolled in Medicare?
Yes. Mark Ostrowski is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Mark Ostrowski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Ostrowski reassigns Medicare benefits to Mark J. Ostrowski, Psy.D. LLC (Stamford, CT). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Ostrowski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Ostrowski accept?
Health plans from Anthem Blue Cross and Blue Shield list Mark Ostrowski as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Mark Ostrowski was last updated on May 16, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Mark Ostrowski, PSY.D. · NPI 1700022324
Clinical provider in Stamford, Connecticut. Individual provider, active in the CMS NPPES registry since January 2, 2009.
## Identity
- **NPI:** 1700022324 (Entity type: Individual)
- **Enumerated:** January 2, 2009
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** 002433 (Connecticut)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 999 SUMMER ST, SUITE 200, Stamford, CT 06905-5546
- **Phone:** (203) 967-4995 · **Fax:** (203) 357-9030
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Mark J. Ostrowski, Psy.D. LLC (NPI 1346649589, Stamford, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** May 16, 2012
- **Other identifiers:** Medicare PIN 680001539 (CT)
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Source: [NPI Profile](https://npiprofile.com/npi/1700022324) · Data from the CMS NPPES public registry.