Psychologist | Cognitive & Behavioral Psychology

Dr. Gareth Harrison, PSYD

1729 21st St Nw, Washington, District Of Columbia, 20009-1101

About Dr. Gareth Harrison

Dr. Gareth Harrison is a psychologist based in Washington, District Of Columbia who is specialized in Cognitive & Behavioral Psychology. His current practice location is 1729 21st St Nw, Washington. Patients can contact him at 202-234-0903. Dr. Gareth Harrison, PSYD, specializes in Cognitive & Behavioral Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1760253892.

Dr. Gareth Harrison has variety of professional responsibilities, including assessment (identifying, diagnosing, and conceptualizing problems experienced by individuals or groups), intervention (creating, implementing and evaluating interventions designed to induce positive change) and consultation. Cognitive Behavioral Psychologists also participates in research, education, training, and clinical practice including a range of issues and populations.

Practice Information

Dr. Gareth Harrison'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. Gareth Harrison
Specialization Cognitive & Behavioral Psychology
Credentials PSYD
Gender Male
Practice Address: 1729 21st St Nw,
Washington, DC - 20009-1101

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 Number1760253892
NPI Enumeration Date: 09 Jan, 2024
NPI Last Update On: 09 Jan, 2024

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. Gareth Harrison are as mentioned below.

License NumberSpecializationStateStatus
Cognitive & Behavioral Psychology Primary

Mailing Address

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

Dr. Gareth Harrison
7618 Clarendon Rd,
Bethesda, MD - 20814-6106

Book an Appointment with Dr. Gareth Harrison

To schedule an appointment, contact Dr. Gareth Harrison at 1729 21st St Nw, Washington, District Of Columbia or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Gareth Harrison:

Dr. Gareth Harrison is a psychologist specializing in Cognitive & Behavioral Psychology. He has variety of professional responsibilities, including assessment (identifying, diagnosing, and conceptualizing problems experienced by individuals or groups), intervention (creating, implementing and evaluating interventions designed to induce positive change) and consultation. Cognitive Behavioral Psychologists also participates in research, education, training, and clinical practice including a range of issues and populations.

Yes, Dr. Gareth Harrison 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. Gareth Harrison practices at 1729 21st St Nw, Washington, District Of Columbia, 20009-1101.

To schedule an appointment with Dr. Gareth Harrison, please contact the office at 202-234-0903.

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