DR. CATHERINE DAY
NPI 1699636720
Psychologist in Frederick, MD

Active since November 19, 2025
10 N JEFFERSON ST STE 203, FREDERICK, MD 21701(202) 750-1028 Get Directions Write a Review

NPPES record last updated: May 22, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: May 22, 2026, Nov 19, 2025 (2 updates tracked since 2025).

About Dr. Catherine Day NPPES

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

DR. CATHERINE DAY (NPI 1699636720) is an individual psychologist in Frederick, Maryland, licensed in Maryland (A01225) and active in the NPI registry since November 2025. She maintains a secondary practice location in Rockville.

NPPES Registry Identity

NPI1699636720
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. CATHERINE DAY
Location Address10 N JEFFERSON ST STE 203Frederick, MD 21701-4865
Mailing Address6010 Executive Blvd Unit 303Rockville, MD 20852-3809 · (202) 750-1028
Sole ProprietorNo
Enumeration DateNovember 19, 2025
Last NPPES UpdateMay 22, 20262 updates tracked since enumeration
NPPES CertifiedMay 22, 2026
NPI 1699636720 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in MD · A01225
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.
10 N JEFFERSON ST STE 203, Frederick, MD 21701

Secondary Practice Location 1

Location 16010 Executive Blvd Unit 303Rockville, MD 20852-3809 · Phone (202) 750-1028 ext. 106

Other Providers at the Same Location NPPES 11

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

Counselor (Mental Health)
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Social Worker (Clinical)
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Counselor
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Counselor (Mental Health)
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Counselor (Mental Health)
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Community/Behavioral Health
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Counselor (Professional)
10 N JEFFERSON ST STE 203
FREDERICK, MD 21701
Social Worker (Clinical)
10 N JEFFERSON ST STE 203
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 Catherine Day's NPI number?

The NPI number for Catherine Day is 1699636720. It was assigned to this individual provider in the NPPES registry on November 19, 2025.

Where is Catherine Day located?

Catherine Day practices at 10 N Jefferson St Ste 203, Frederick, MD 21701. The listed phone number is (202) 750-1028.

What is Catherine Day's specialty?

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

When was this NPI record last updated?

The NPPES record for Catherine Day was last updated on May 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.