Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark J. Ostrowski, PSYD LLC

Organization Clinical Psychologist · NPI 1346649589

Mark J. Ostrowski, PSYD LLC is a Clinical Psychologist in Stamford, Connecticut. Licensed in Connecticut. Registered with an NPI since 2014.

Licensed in
CT
In the registry since
2014
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

999 Summer St Ste 200
Stamford, CT 06905-5546
Phone: (203) 967-4995
Fax: (203) 357-9030
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 002433 (CT)

Record details

NPI number1346649589
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Ostrowski — Clinical Psychologist · (203) 967-4995
NPI enumeratedAugust 13, 2014
Last updated in NPPESAugust 13, 2014
Mailing address999 Summer St, Suite 200, Stamford, CT 06905-5546

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