Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dennis Gates, Mental Health LLC

Organization Prescribing (Medical) Psychologist · NPI 1134656747

Dennis Gates, Mental Health LLC is a Prescribing (Medical) Psychologist in Largo, Maryland. Licensed in Maryland. Registered with an NPI since 2017.

Licensed in
MD
In the registry since
2017
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

See every abbreviation used in this directory →

Practice location Address checks out

1300 Mercantile Ln Ste 198
Largo, MD 20774-5339
Phone: (301) 955-9812
Fax: (301) 955-9813
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Prescribing (Medical) Psychologist (primary) Taxonomy 103TP0016X · Licence R207808 (MD)

Record details

NPI number1134656747
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Tom Gates — Psychiatric Nurse Practitioner · (301) 955-9812
NPI enumeratedMay 12, 2017
Last updated in NPPESOctober 27, 2025
Certification dateOctober 27, 2025
Mailing address1300 Mercantile Ln Ste 198, Largo, MD 20774-5339