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

John Constantine, PHD

Individual provider Psychologist · NPI 1386636595

John Constantine, PHD is a Psychologist in Greenfield, Indiana. Licensed in Indiana. Registered with an NPI since 2005.

Licensed in
IN
In the registry since
2005
Specialties on file
2
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

120 W McKenzie Rd Ste F
Greenfield, IN 46140-1072
Phone: (317) 468-6200
Fax: (317) 468-6201
Show map & directions

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 20090254A (IN)
Psychiatry Physician Taxonomy 2084P0800X · Licence 20090254A (IN)

Record details

NPI number1386636595
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedAugust 16, 2005
Last updated in NPPESOctober 8, 2010