DENNIS GATES, MENTAL HEALTH LLC
NPI 1134656747
Psychologist - Prescribing (Medical) in Largo, MD

Q: What is Dennis Gates, Mental Health LLC's NPI number?

The NPI number for Dennis Gates, Mental Health LLC is 1134656747. It was assigned to this organization in the NPPES registry on May 12, 2017.

Q: What is Dennis Gates, Mental Health LLC's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Prescribing (Medical), with taxonomy code 103TP0016X.

Active since May 12, 2017

1300 MERCANTILE LN STE 198, LARGO, MD 20774(301) 955-9812(301) 955-9813 Get Directions Write a Review

NPPES record last updated: October 27, 2025. Verified against the NPPES registry weekly; last sync: August 30, 2026.

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About Dennis Gates, Mental Health Llc NPPES

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

DENNIS GATES, MENTAL HEALTH LLC (NPI 1134656747) is a healthcare organization registered as a prescribing (medical) in Largo, Maryland and active in the NPI registry since May 2017. The organization lists Tom Dennis Gates, Psychiatric Nurse Practitioner, as its authorized official.

NPPES Registry Identity

NPI1134656747

Entity TypeOrganization

Primary Taxonomy103TP0016X

Legal Business NameDENNIS GATES, MENTAL HEALTH LLC

Location Address1300 MERCANTILE LN STE 198Largo, MD 20774-5339

Mailing Address1300 Mercantile Ln Ste 198Largo, MD 20774-5339 · (301) 955-9812 · Fax (301) 955-9813

Phone(301) 955-9812

Fax(301) 955-9813

Organization SubpartNo

Authorized OfficialTom Dennis GatesPsychiatric Nurse Practitioner · (301) 955-9812

Enumeration DateMay 12, 2017

Last NPPES UpdateOctober 27, 2025

NPPES CertifiedOctober 27, 2025

✔ NPI 1134656747 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · Prescribing (Medical)Behavioral Health & Social Service Providers

Taxonomy Code103TP0016X

License✔ Licensed in MD · R207808

Definition

A licensed, doctoral-level psychologist authorized to prescribe and has undergone specialized education and training in preparation for prescriptive practice and has passed an examination accepted by the state board of psychology relevant to establishing competence for prescribing, and has received from the state board of psychology a current certificate granting prescriptive authority, which has not been revoked or suspended.

1300 MERCANTILE LN STE 198, Largo, MD 20774

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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

Other Providers at the Same Location NPPES 12

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

MR. TOM DENNIS GATES II CRNP-PMH

Nurse Practitioner (Psychiatric/Mental Health)

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 955-9812

CENTER FOR THERAPEUTIC CONCEPTS INC

Clinic/Center (Rehabilitation)

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 386-2991

PATRICIA MONICA IVEY MSW

Social Worker

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 386-2991

LAVINA MIRANDA THOMPSON BOWLING LCPC

Counselor (Professional)

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 386-2991

REGINA ONEAL MA LCPC LSWA

Counselor (Mental Health)

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 386-2991

CENTER FOR THERAPEUTIC CONCEPTS INC

Community/Behavioral Health

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (301) 386-2991

CHARONNE MONIIQUE RANDALL LCSW-C

Social Worker (Clinical)

1300 MERCANTILE LN STE 198
UPPER MARLBORO, MD 20774

Prince George's County (301) 386-2991

CHARMAINE NICOLE STANLEY

Behavior Technician

1300 MERCANTILE LN STE 198
LARGO, MD 20774

Prince George's County (240) 604-3615

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 Dennis Gates, Mental Health LLC's NPI number?

The NPI number for Dennis Gates, Mental Health LLC is 1134656747. It was assigned to this organization in the NPPES registry on May 12, 2017.

Where is Dennis Gates, Mental Health LLC located?

Dennis Gates, Mental Health LLC is located at 1300 Mercantile Ln Ste 198, Largo, MD 20774. The listed phone number is (301) 955-9812.

What is Dennis Gates, Mental Health LLC's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Prescribing (Medical), with taxonomy code 103TP0016X.

When was this NPI record last updated?

The NPPES record for Dennis Gates, Mental Health LLC was last updated on October 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.