Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GEORGE MARSHALL COWAN III PSY.D.
NPI 1215283833
Psychologist - Clinical in Jessup, MD

Q: What is George Cowan's NPI number?

The NPI number for George Cowan is 1215283833. It was assigned to this individual provider in the NPPES registry on August 1, 2012. The provider is also known as Dr. Marshall Cowan Psy.D..

Q: What is George Cowan's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Q: When was this NPI record last updated?

The NPPES record for George Cowan was last updated on June 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 49 days 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.

Active since August 01, 2012

8450 DORSEY RUN RD, JESSUP, MD 20794(410) 724-3067 Get Directions Write a Review

NPPES record last updated: June 29, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Dr. George Marshall Cowan Iii Psy.d. NPPES

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

DR. GEORGE MARSHALL COWAN III PSY.D. (NPI 1215283833) is an individual clinical provider in Jessup, Maryland, licensed in Maryland (04056) and active in the NPI registry since August 2012.

NPPES Registry Identity

NPI1215283833

Entity TypeIndividualMale

Primary Taxonomy103TC0700X

Provider Legal NameDR. GEORGE MARSHALL COWAN IIICredential: PSY.D.

Location Address8450 DORSEY RUN RDJessup, MD 20794-9486

Mailing Address8450 Dorsey Run RdJessup, MD 20794-9486 · (410) 724-3067

Phone(410) 724-3067

Sole ProprietorNo

Enumeration DateAugust 1, 2012

Last NPPES UpdateJune 29, 2026

NPPES CertifiedJune 29, 2026

✔ NPI 1215283833 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code103TC0700X

License✔ Licensed in MD · 04056

Definition

A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

8450 DORSEY RUN RD, Jessup, MD 20794

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Other Names 1

Other Name (5)Dr. Marshall Cowan Psy.d.

Other Providers at the Same Location NPPES 20

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

KATHJIA DEMAISIP OTR/L

Occupational Therapist

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3000

ASHLEY DEVINE

Social Worker (Clinical)

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3115

REHEMA ROSE BARNETT LMSW

Social Worker

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3135

DR. KHALID EL-SAYED MD

Student in an Organized Health Care Education/Training Program

8450 DORSEY RUN RD, FORENSIC PSYCHIATRY FELLOWSHIP / PRE-TRIAL DIVISION
JESSUP, MD 20794

Howard County (410) 671-5529

MR. CRAIG MICHAEL MADIOU LCSW-C

Social Worker (Clinical)

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3125

RACHELLE MECHALY

Social Worker (Clinical)

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3119

CLIFTON T PERKINS HOSPITAL

Pharmacy (Institutional Pharmacy)

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3168

MS. AMA BENTUMA ABBAN PMHNP

Nurse Practitioner (Psychiatric/Mental Health)

8450 DORSEY RUN RD
JESSUP, MD 20794

Howard County (410) 724-3000

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 George Cowan's NPI number?

The NPI number for George Cowan is 1215283833. It was assigned to this individual provider in the NPPES registry on August 1, 2012. The provider is also known as Dr. Marshall Cowan Psy.D..

Where is George Cowan located?

George Cowan practices at 8450 Dorsey Run Rd, Jessup, MD 20794. The listed phone number is (410) 724-3067.

What is George Cowan's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

When was this NPI record last updated?

The NPPES record for George Cowan was last updated on June 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 49 days 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.