Psychologist
57,378 active US providers register Psychologist as their primary taxonomy. That is 0.6% of every provider in the registry, and the 44th largest of 584 specialties with a page here.
- Taxonomy code
- 103T00000X
- Grouping
- Behavioral Health & Social Service Providers
- Classification
- Psychologist
- Active providers
- 57,378
- States covered
- 51 of 51
What the code means
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.
Definition quoted verbatim from the NUCC Health Care Provider Taxonomy code set, version 25.1. Not paraphrased.
Where they are
Counted by practice location, not by mailing address or by licence state. A provider practising across a state line is counted where they practise.
| State | Providers | Share |
|---|---|---|
| California | 8,205 | |
| New York | 5,535 | |
| Pennsylvania | 3,175 | |
| Michigan | 3,107 | |
| Florida | 2,825 | |
| Texas | 2,665 | |
| Massachusetts | 2,575 | |
| North Carolina | 1,991 | |
| Minnesota | 1,963 | |
| New Jersey | 1,794 | |
| Ohio | 1,766 | |
| Maryland | 1,411 | |
| Illinois | 1,318 | |
| Colorado | 1,311 | |
| Washington | 1,264 |
Showing the 15 largest of 51 states with at least one.
Who registers under this code
48,674 of these are people and 8,704 are organisations, so 15% of the code is businesses rather than clinicians. Half of them had registered by 2010, and 10,399 registered in the last five years, 18% of the current population.
That is close to the pace of the registry as a whole.
Where the practices are
By practice-location city. City counts are noisier than state counts, because a large employer files one address for many providers.
- NEW YORK, NY1,819
- LOS ANGELES, CA757
- SAN FRANCISCO, CA552
- SAN DIEGO, CA506
- BOSTON, MA479
- BROOKLYN, NY466
- PHILADELPHIA, PA453
- CHICAGO, IL435
- HOUSTON, TX427
- MINNEAPOLIS, MN375
What else they list
Providers whose primary code is Psychologist most often carry these secondary taxonomies as well. This is the closest thing the registry has to a map of which specialties overlap in practice, and it is not published anywhere else.
| Also listed | Providers | Share |
|---|---|---|
| Clinical Psychologist | 3,139 | 5.5% |
| Mental Health Counselor | 1,339 | 2.3% |
| Clinical Child & Adolescent Psychologist | 1,108 | 1.9% |
| Counseling Psychologist | 957 | 1.7% |
| Student in an Organized Health Care Education/Training Program | 930 | 1.6% |
| Cognitive & Behavioral Psychologist | 813 | 1.4% |
| School Psychologist | 684 | 1.2% |
| Clinical Neuropsychologist | 657 | 1.1% |
Nearby specialties
Other taxonomies NUCC files under Psychologist.
- Clinical Psychologist82,705
- School Psychologist14,896
- Counseling Psychologist9,604
- Clinical Child & Adolescent Psychologist5,759
- Cognitive & Behavioral Psychologist2,400
- Intellectual & Developmental Disabilities Psychologist1,234
Looking up a specific provider
These counts come from the monthly NPPES file. To check one provider, use their NPI: the lookup reads the live registry and shows whether the identifier is still active, which the monthly file cannot tell you about the last few weeks.
Counts from npidata_pfile_20050523-20260712.csv, built 2026-08-09. Primary taxonomy only, deactivated identifiers excluded.