TRILLIUM PSYCHOLOGICAL SERVICES PLLC
NPI 1053201970
Psychologist in Leonardtown, MD

Active since July 03, 2025
40900 MERCHANTS LN UNIT 207, LEONARDTOWN, MD 20650(518) 369-5258 Get Directions Write a Review

NPPES record last updated: December 15, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 15, 2025, Nov 14, 2025, Jul 3, 2025 (3 updates tracked since 2025).

About Trillium Psychological Services Pllc NPPES

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

TRILLIUM PSYCHOLOGICAL SERVICES PLLC (NPI 1053201970) is a healthcare organization registered as a psychologist in Leonardtown, Maryland and active in the NPI registry since July 2025. The organization lists Michelle Mcdonald, Owner, as its authorized official.

NPPES Registry Identity

NPI1053201970
Entity TypeOrganization
Primary Taxonomy103T00000X
Legal Business NameTRILLIUM PSYCHOLOGICAL SERVICES PLLC
Location Address40900 MERCHANTS LN UNIT 207Leonardtown, MD 20650-3796
Mailing Address40900 Merchants Ln Unit 207Leonardtown, MD 20650-3796 · (518) 369-5282 · Fax (301) 560-4954
Organization SubpartNo
Authorized OfficialMichelle McdonaldOwner · (518) 369-5282
Enumeration DateJuly 3, 2025
Last NPPES UpdateDecember 15, 20253 updates tracked since enumeration
NPPES CertifiedDecember 15, 2025
✔ NPI 1053201970 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
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.
40900 MERCHANTS LN UNIT 207, Leonardtown, MD 20650

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Trillium Psychological Services Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Trillium Psychological Services PLLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Clinical Psychologist
NPI 1417494469
40900 MERCHANTS LN UNIT 207
Leonardtown, MD 20650
(518) 369-5282
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Trillium Psychological Services PLLC's NPI number?

The NPI number for Trillium Psychological Services PLLC is 1053201970. It was assigned to this organization in the NPPES registry on July 3, 2025.

Where is Trillium Psychological Services PLLC located?

Trillium Psychological Services PLLC is located at 40900 Merchants Ln Unit 207, Leonardtown, MD 20650. The listed phone number is (518) 369-5258.

What is Trillium Psychological Services PLLC's specialty?

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

Is Trillium Psychological Services PLLC enrolled in Medicare?

Yes. Trillium Psychological Services PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Trillium Psychological Services PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Clinical Psychologist) reassigns their Medicare billing to Trillium Psychological Services PLLC. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Trillium Psychological Services PLLC was last updated on December 15, 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.