Psychologist | Clinical Psychology

Dr. Mark Ostrowski, PSY.D.

999 Summer St, Suite 200, Stamford, Connecticut, 06905-5546

About Dr. Mark Ostrowski

Dr. Mark Ostrowski is a psychologist based in Stamford, Connecticut who is specialized in Clinical Psychology. Active license number of Dr. Mark Ostrowski is 002433 for Clinical Psychology in Connecticut. His current practice location is 999 Summer St, Suite 200, Stamford. Patients can contact him at 203-967-4995 or can fax him at 203-357-9030. Dr. Mark Ostrowski, PSY.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1700022324.

Dr. Mark Ostrowski is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. Mark Ostrowski's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Mark Ostrowski
Specialization Clinical Psychology
Credentials PSY.D.
Gender Male
Practice Address: 999 Summer St, Suite 200
Stamford, CT - 06905-5546
Fax 203-357-9030

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1700022324
NPI Enumeration Date: 02 Jan, 2009
NPI Last Update On: 16 May, 2012

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Mark Ostrowski are as mentioned below.

License NumberSpecializationStateStatus
002433Clinical Psychology ConnecticutPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Mark Ostrowski
999 Summer St, Suite 200
Stamford, CT - 06905-5546
Phone: 203-967-4995
Fax: 203-357-9030

Book an Appointment with Dr. Mark Ostrowski

To schedule an appointment, contact Dr. Mark Ostrowski at 999 Summer St, Suite 200, Stamford, Connecticut or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Mark Ostrowski:

Dr. Mark Ostrowski is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Dr. Mark Ostrowski is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Mark Ostrowski practices at 999 Summer St, Suite 200, Stamford, Connecticut, 06905-5546.

To schedule an appointment with Dr. Mark Ostrowski, please contact the office at 203-967-4995.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.