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
Mailing addressPo Box 129, Greenfield, IN 46140-0129