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

Dr. Mark Aaron Gapen, PHD

Individual provider Psychologist · NPI 1467786616

Dr. Mark Aaron Gapen, PHD is a Clinical Psychologist in Brookline, Massachusetts. Graduated from Emory University School of Medicine in 2009, 17 years ago. Accepts Medicare assignment.

Years since qualifying
17
Trained at
Emory University School of Medicine
In the registry since
2009
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 →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1269 Beacon St
Brookline, MA 02446-5248
Phone: (617) 232-1303
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X

Record details

NPI number1467786616
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedSeptember 21, 2009
Last updated in NPPESSeptember 21, 2009
Mailing address40 Long Ave, Boston, MA 02134-2554

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolEMORY UNIVERSITY SCHOOL OF MEDICINE
Graduated 2009 (17 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Brookline