Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Margaret Farrell, PSY.D.

Clinical Psychologist in Rockville, MD · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1780906438

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Registry record

Entity type Individual (Type 1)

Name Margaret Farrell

Credential PSY.D.

Sex Female

Practice address Rockville, MD, 20850

Phone (240) 750-6467

Enumeration date Feb 23, 2010

Last updated in NPPES Feb 1, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 05481 (MD) Primary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 35SI00506400 (NJ) Secondary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What is the NPI number for Margaret Farrell?

The National Provider Identifier (NPI) for Margaret Farrell is 1780906438, a Type 1 (individual) record in the CMS NPPES registry.

Where does Margaret Farrell practice?

The practice location on file with NPPES is in Rockville, MD. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-01.