Taxonomy code 103T00000X: Psychologist

103T00000X is the NUCC Health Care Provider Taxonomy code for Psychologist, in the group Behavioral Health & Social Service Providers. It is one of the codes a provider lists on the NPI application to tell CMS and payers what they do.

Code

103T00000X

Grouping

Behavioral Health & Social Service Providers

Classification

Psychologist

Section

Individual

NUCC version

26.1

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.

NUCC notes: Source: American Psychological Association [1/1/2007: modified definition]

Who uses this code

The general psychologist code. Licensed clinical psychologists often choose Psychologist, Clinical instead.

Psychologists (the usual code)

Get an NPI with this taxonomy

Two free ways. SimpleNPI files the application for you with 103T00000X entered from your license type; the NPI usually arrives by email and text, with all the documentation, within 10 minutes. Or apply yourself at nppes.cms.hhs.gov and type the code into the taxonomy field. First, check the free registry in case you already have an NPI.

Option 1 · Free · Easiest

SimpleNPI files it for you

One short form: name, license, contact, address, identity and an e-signed authorization. About 3 minutes, no CMS account to create.
A person checks your license and address, then files the application with CMS under your signed authorization.
Your NPI arrives by email and text, with all the documentation, usually within 10 minutes. Filed after midnight Eastern? It issues around 6 am Eastern.

Usually within 10 minutes after the form is complete.

Start the free application

Option 2 · Free

Apply yourself at NPPES

Create an Identity & Access account at nppes.cms.hhs.gov.
Choose Apply for an NPI for myself, Individual (Type 1).
Enter identity, addresses, taxonomy code and license number, then certify and submit.

Usually a few business days; often minutes when the Social Security match passes.

Go to NPPES

Related codes in Psychologist

Code	Name
`103TA0400X`	Psychologist, Addiction (Substance Use Disorder)
`103TA0700X`	Psychologist, Adult Development & Aging
`103TC0700X`	Psychologist, Clinical
`103TC2200X`	Psychologist, Clinical Child & Adolescent
`103TB0200X`	Psychologist, Cognitive & Behavioral
`103TC1900X`	Psychologist, Counseling
`103TE1000X`	Psychologist, Educational
`103TE1100X`	Psychologist, Exercise & Sports
`103TF0000X`	Psychologist, Family
`103TF0200X`	Psychologist, Forensic
`103TP2701X`	Psychologist, Group Psychotherapy
`103TH0004X`	Psychologist, Health

Questions

Is 103T00000X the right taxonomy code for a psychologist?

Yes. 103T00000X, Psychologist, is the code SimpleNPI files for psychologists. Related codes some choose instead: 103TC0700X (Clinical Psychologist), 103TC2200X (Clinical Child & Adolescent Psychologist), 103TH0004X (Health Psychologist), 103G00000X (Clinical Neuropsychologist).

Can I change my taxonomy code later?

Yes, for free, in your NPPES account. Add the new code with its license, make it primary, and remove the old one if it no longer applies. The NPI itself never changes.

Does 103T00000X have to match my license?

It should describe the profession your license covers. Payers compare the taxonomy with the license during credentialing, and a mismatch slows that down.

Written by Ammon Hardin, LMT, who grew a massage practice to ten locations, built a veteran therapy network, and credentialed a large number of providers along the way. Updated Tue Oct 27, 2026. Free to read, free to use; SimpleNPI files NPI applications for free.