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

DR. MARISSA DENNIS PHD
NPI 1841999067
Psychologist in Brookline, MA

Active since February 27, 2023
2 BROOKLINE PL BOSTON CHILDREN'S BROOKLINE, BROOKLINE, MA 02445(617) 355-7025 Get Directions Write a Review

NPPES record last updated: July 22, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 22, 2026, May 30, 2025, Feb 27, 2023 (3 updates tracked since 2023).

About Dr. Marissa Dennis Phd NPPES

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

DR. MARISSA DENNIS PHD (NPI 1841999067) is an individual psychologist in Brookline, Massachusetts and active in the NPI registry since February 2023.

NPPES Registry Identity

NPI1841999067
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. MARISSA DENNISCredential: PHD
Location Address2 BROOKLINE PL BOSTON CHILDREN'S BROOKLINEBrookline, MA 02445
Mailing Address2 Brookline Pl Boston Children's Brookline, Division Of Developmental MedicineBrookline, MA 02445 · (802) 760-7673
Sole ProprietorYes
Enumeration DateFebruary 27, 2023
Last NPPES UpdateJuly 22, 20263 updates tracked since enumeration
NPPES CertifiedJuly 22, 2026
NPI 1841999067 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
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.
2 BROOKLINE PL BOSTON CHILDREN'S BROOKLINE, Brookline, MA 02445

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

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 Marissa Dennis's NPI number?

The NPI number for Marissa Dennis is 1841999067. It was assigned to this individual provider in the NPPES registry on February 27, 2023.

Where is Marissa Dennis located?

Marissa Dennis practices at 2 Brookline Pl Boston Children's Brookline, Brookline, MA 02445. The listed phone number is (617) 355-7025.

What is Marissa Dennis'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 Marissa Dennis was last updated on July 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.