Psychologist | Clinical Psychology

Dr. Marissa Dennis, PHD

300 Longwood Ave, Boston, Massachusetts, 02115-5724

About Dr. Marissa Dennis

Dr. Marissa Dennis is a psychologist based in Boston, Massachusetts who is specialized in Clinical Psychology. Active license number of Dr. Marissa Dennis is PSY10001753 for Clinical Psychology in Massachusetts. Her current practice location is 300 Longwood Ave, Boston. Patients can contact her at 617-355-6000. Dr. Marissa Dennis, PHD, specializes in Clinical Psychology and her NPI number (Unique professional ID assigned by NPPES) is 1841999067.

Dr. Marissa Dennis is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). Her main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that she can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. Marissa Dennis's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Marissa Dennis
Specialization Clinical Psychology
Credentials PHD
Gender Female
Practice Address: 300 Longwood Ave,
Boston, MA - 02115-5724

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1841999067
NPI Enumeration Date: 27 Feb, 2023
NPI Last Update On: 10 Aug, 2026

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Marissa Dennis are as mentioned below.

License NumberSpecializationStateStatus
PSY10001753Clinical Psychology MassachusettsPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Marissa Dennis
300 Longwood Ave,
Boston, MA - 02115-5724
Phone: 617-355-6000

Book an Appointment with Dr. Marissa Dennis

To schedule an appointment, contact Dr. Marissa Dennis at 300 Longwood Ave, Boston, Massachusetts or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Marissa Dennis:

Dr. Marissa Dennis is a psychologist specializing in Clinical Psychology. She is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). Her main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that she can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Dr. Marissa Dennis is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Marissa Dennis practices at 300 Longwood Ave, Boston, Massachusetts, 02115-5724.

To schedule an appointment with Dr. Marissa Dennis, please contact the office at 617-355-6000.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.