Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARK F GEER
NPI 1609843507
Psychologist in Wellesley, MA

Active since March 01, 2006
11 RIVER ST, COLONY CARE BEHAVIORAL HEALTH, WELLESLEY, MA 02481(781) 431-1177(781) 431-1181 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mark F Geer NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK F GEER (NPI 1609843507) is an individual psychologist in Wellesley, Massachusetts, licensed in Massachusetts (2969) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1609843507
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameMARK F GEER
Location Address11 RIVER ST, COLONY CARE BEHAVIORAL HEALTHWellesley, MA 02481-2098
Mailing Address11 River StWellesley, MA 02481-2098 · (781) 431-1177 · Fax (781) 431-1181
Fax(781) 431-1181
Sole ProprietorNo
Enumeration DateMarch 1, 2006
Last NPPES UpdateJuly 13, 2026
NPI 1609843507 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in MA · 2969
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
11 RIVER ST, Wellesley, MA 02481

Other Identifiers 1

Medicaid0510645MA

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Social Worker (Clinical)
11 RIVER ST, COLONY CARE BEHAVIORAL HEALTH
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST, STE 2
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST
WELLESLEY, MA 02481
Psychiatry & Neurology (Psychiatry)
11 RIVER ST
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST
WELLESLEY, MA 02481
Social Worker (Clinical)
11 RIVER ST
WELLESLEY, MA 02481

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Geer's NPI number?

The NPI number for Mark Geer is 1609843507. It was assigned to this individual provider in the NPPES registry on March 1, 2006.

Where is Mark Geer located?

Mark Geer practices at 11 River St Colony Care Behavioral Health, Wellesley, MA 02481. The listed phone number is (781) 431-1177.

What is Mark Geer's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

When was this NPI record last updated?

The NPPES record for Mark Geer was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.