Psychologist Taxonomy Code 103T00000X

103T00000X Level II - Classification
69,841Registered providers
25.1NUCC version
56States & territories
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.

Code Details for 103T00000X

ClassificationPsychologist
Code levelLevel II - Classification
Last updatedJanuary 01, 2026
Notes / sourceSource: American Psychological Association [1/1/2007: modified definition]

About Taxonomy Code 103T00000X

The taxonomy code 103T00000X identifies Psychologist within the Behavioral Health & Social Service Providers provider grouping. It is a Level II — Classification code, which names a provider's occupation or service within the broader provider grouping.

NPI records show 69,841 registered providers whose primary or secondary taxonomy is this code. Of these, 12,922 (19%) are registered as organizations and 56,919 (81%) as individual providers. The states with the most psychologist providers are California (9,632), New York (6,182), Michigan (3,769).

Taxonomy codes are self-selected by the provider based on their education and training; they describe the provider's type and specialty, not the specific services rendered.

Provider Composition & Statistics

69,841Total providers
12,922Organizations 19%
56,919Individuals 81%
39,196Female
17,700Male
23Undisclosed

Among individual providers:

Gender is recorded for individual providers only; organizations are not gendered. Source: NPPES, last updated 2026-06-21T00:00:00.

View all 69,841 providers

Psychologist Providers by State

Provider counts by U.S. state and territory. Select a state to open its provider directory.

Frequently Asked Questions

NPPES lists 69,841 registered providers with this taxonomy code (Psychologist).

Both. About 19% of these providers are registered as organizations and 81% as individuals.

This taxonomy code does not map to a Medicare specialty code in the current crosswalk.

It is a Level II - Classification code in the NUCC Health Care Provider Taxonomy set.

Use the "Providers by state" directory on this page to open the list of psychologist providers registered in any U.S. state.

Source: National Uniform Claim Committee (NUCC) Health Care Provider Taxonomy code set, Version 25.1. Provider counts from NPPES. See nucc.org.