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

Individual provider Clinical Social Worker · NPI 1275515009

Mr. Mark Leslie Gaynor, LCSW is a Clinical Social Worker in New Haven, Connecticut. Qualified in 1975, 51 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
51
Licensed in
CT
In the registry since
2005
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

100 Whitney Ave
New Haven, CT 06510
Phone: (203) 865-0865
Fax: (203) 865-0093
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 000930 (CT)

Record details

NPI number1275515009
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedNovember 17, 2005
Last updated in NPPESJune 27, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 1975 (51 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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