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

DR. THANH TAM NGUYEN-LOUIE PHD
NPI 1659866390
Psychologist in Catonsville, MD

Active since June 26, 2018PECOS Enrolled
1009 FREDERICK RD, CATONSVILLE, MD 21228(443) 355-7572 Get Directions Write a Review

NPPES record last updated: July 15, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 15, 2026, Mar 1, 2021, Nov 24, 2020 and 1 more (4 updates tracked since 2018).

About Dr. Thanh Tam Nguyen-louie Phd NPPES

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

DR. THANH TAM NGUYEN-LOUIE PHD (NPI 1659866390) is an individual psychologist in Catonsville, Maryland, licensed in Maryland (06548) and active in the NPI registry since June 2018. She is enrolled in Medicare PECOS and is a graduate of Other (2018).

NPPES Registry Identity

NPI1659866390
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. THANH TAM NGUYEN-LOUIECredential: PHD
Location Address1009 FREDERICK RDCatonsville, MD 21228-5055
Mailing Address4520 Rusty GateEllicott City, MD 21043-6565 · (858) 361-4084
Sole ProprietorYes
Medical School CMSOtherGraduated 2018
Enumeration DateJune 26, 2018
Last NPPES UpdateJuly 15, 20264 updates tracked since enumeration
NPPES CertifiedJuly 15, 2026
NPI 1659866390 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in MD · 06548
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
Also ListedPsychologist · ClinicalTaxonomy 103TC0700X · License 06548 (MD)
1009 FREDERICK RD, Catonsville, MD 21228

Other Names 1

Other Name (5)Tam Nguyen-louie Phd

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

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare (PECOS)

Dr. Thanh Tam Nguyen-louie Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2264929579
PECOS Enrollment IDI20251014000255
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

Counselor (Mental Health)
1009 FREDERICK RD
CATONSVILLE, MD 21228
Internal Medicine
1009 FREDERICK RD
BALTIMORE, MD 21228
Counselor (Professional)
1009 FREDERICK RD
CATONSVILLE, MD 21228
Counselor (Professional)
1009 FREDERICK RD
CATONSVILLE, MD 21228
Community/Behavioral Health
1009 FREDERICK RD
CATONSVILLE, MD 21228
Social Worker
1009 FREDERICK RD
CATONSVILLE, MD 21228
Social Worker (Clinical)
1009 FREDERICK RD
CATONSVILLE, MD 21228
Psychologist
1009 FREDERICK RD
CATONSVILLE, MD 21228

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 Thanh Tam Nguyen-louie's NPI number?

The NPI number for Thanh Tam Nguyen-louie is 1659866390. It was assigned to this individual provider in the NPPES registry on June 26, 2018. The provider is also known as Tam Nguyen-Louie Phd.

Where is Thanh Tam Nguyen-louie located?

Thanh Tam Nguyen-louie practices at 1009 Frederick Rd, Catonsville, MD 21228. The listed phone number is (443) 355-7572.

What is Thanh Tam Nguyen-louie's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Thanh Tam Nguyen-louie enrolled in Medicare?

Yes. Thanh Tam Nguyen-louie is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Thanh Tam Nguyen-louie was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 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.