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

Dr. Leonard I Leven, MD

Individual provider Psychiatry Physician · NPI 1821098245

Dr. Leonard I Leven, MD is a Psychiatry Physician in Old Greenwich, Connecticut. Licensed in Connecticut and New York. Registered with an NPI since 2005.

Licensed in
CT, NY
In the registry since
2005
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

3 W End Ave
Old Greenwich, CT 06870-1640
Phone: (203) 637-1486
Fax: (203) 637-1486
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Child & Adolescent Psychiatry Physician (primary) Taxonomy 2084P0804X · Licence 167310 (NY)
Psychiatry Physician Taxonomy 2084P0800X · Licence 026744 (CT)
Psychiatry Physician Taxonomy 2084P0800X · Licence 167310 (NY)
Child & Adolescent Psychiatry Physician Taxonomy 2084P0804X · Licence 026744 (CT)

Record details

NPI number1821098245
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 28, 2005
Last updated in NPPESJuly 13, 2026

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