DAVID GEORGE THOMASSEN MS, LGPC
NPI 1013338623
Counselor - Mental Health in Frederick, MD

Active since December 27, 2013
309 E PATRICK ST, FREDERICK, MD 21701(240) 578-2322 Get Directions Write a Review

NPPES record last updated: December 27, 2013. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About David George Thomassen Ms, Lgpc NPPES

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

DAVID GEORGE THOMASSEN MS, LGPC (NPI 1013338623) is an individual mental health provider in Frederick, Maryland, licensed in Maryland (LGP3782) and active in the NPI registry since December 2013.

NPPES Registry Identity

NPI1013338623
Entity TypeIndividualMale
Primary Taxonomy101YM0800X
Provider Legal NameDAVID GEORGE THOMASSENCredential: MS, LGPC
Location Address309 E PATRICK STFrederick, MD 21701-5614
Mailing Address309 E Patrick StFrederick, MD 21701-5614 · (240) 578-2322
Sole ProprietorYes
Enumeration DateDecember 27, 2013
NPI 1013338623 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License Licensed in MD · LGP3782
309 E PATRICK ST, Frederick, MD 21701

Other Providers at the Same Location NPPES 16

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

Social Worker (Clinical)
309 E PATRICK ST
FREDERICK, MD 21701
Nurse Practitioner (Psychiatric/Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701
Counselor (Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701
Counselor (Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701
Nurse Practitioner (Adult Health)
309 E PATRICK ST
FREDERICK, MD 21701
Nurse Practitioner (Psychiatric/Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701
Counselor (Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701
Nurse Practitioner (Psychiatric/Mental Health)
309 E PATRICK ST
FREDERICK, MD 21701

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 David Thomassen's NPI number?

The NPI number for David Thomassen is 1013338623. It was assigned to this individual provider in the NPPES registry on December 27, 2013.

Where is David Thomassen located?

David Thomassen practices at 309 E Patrick St, Frederick, MD 21701. The listed phone number is (240) 578-2322.

What is David Thomassen's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for David Thomassen was last updated on December 27, 2013. NPI Profile syncs with the weekly NPPES data releases published by CMS.