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Respiratory, Developmental, Rehabilitative And Restorative Service Providers › Occupational Therapy Assistant

Occupational Therapy Assistant Taxonomy Code

224Z00000X Level II - Classification
43,239Registered providers
Version 25.1NUCC version
54States & territories

Definition

An occupational therapy assistant is a person who has graduated from an occupational therapy assistant program accredited by the Accreditation Council for Occupational Therapy Education (ACOTE) or predecessor organizations, has successfully completed a period of supervised fieldwork experience required by the accredited occupational therapy assistant program, has passed a nationally recognized entry-level examination for occupational therapy assistants, and fulfills state requirements for licensure, certification, or registration. An occupational therapy assistant provides interventions under the supervision of an occupational therapist which emphasize the therapeutic use of everyday life activities (i.e., occupations) with individuals or groups for the purpose of facilitating participation in roles and situations and in home, school, workplace, community and other settings. Occupational therapy services are provided for the purpose of promoting health and wellness and are provided to those who have or are at risk for developing an illness, injury, disease, disorder, condition, impairment, disability, activity limitation, or participation restriction. Occupational therapy assistants address the physical, cognitive, psychosocial, sensory, and other aspects of occupational performance in a variety of contexts to support engagement in everyday life activities that affect health, well-being, and quality of life.

Grouping
Respiratory, Developmental, Rehabilitative And Restorative Service Providers
Classification
Occupational Therapy Assistant
Notes / source
Source: The Guide to Occupational Therapy Practice, 2nd edition. Bethesda: American Occupational Therapy Association, 2007. [7/1/2008: definition changed, source changed]
Last updated
January 01, 2026

Provider composition

43,239Total providers
1,576Organizations 4%
41,663Individuals 96%
36,804Female
4,857Male
2Undisclosed

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 43,239 providers

Occupational Therapy Assistant providers by state

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

All states (nationwide) 43,239 Alabama288Alaska47Arizona1,109Arkansas1,119California1,777Colorado741Connecticut468Delaware253District Of Columbia31Florida4,173Georgia642Guam1Hawaii84Idaho169Illinois1,611Indiana1,116Iowa274Kansas615Kentucky777Louisiana239Maine281Maryland733Massachusetts788Michigan912Minnesota398Mississippi352Missouri1,030Montana103Nebraska258Nevada187New Hampshire315New Jersey699New Mexico339New York2,829North Carolina1,421North Dakota103Ohio2,420Oklahoma920Oregon437Pennsylvania2,194Puerto Rico177Rhode Island172South Carolina778South Dakota99Tennessee1,043Texas4,316Utah138Vermont61Virgin Islands1Virginia1,117Washington816West Virginia363Wisconsin1,479Wyoming85

About taxonomy code 224Z00000X

The taxonomy code 224Z00000X identifies Occupational Therapy Assistant within the Respiratory, Developmental, Rehabilitative and Restorative 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 43,239 registered providers whose primary or secondary taxonomy is 224Z00000X. Of these, 1,576 (4%) are registered as organizations and 41,663 (96%) as individual providers. The states with the most occupational therapy assistant providers are Texas (4,316), Florida (4,173), New York (2,829).

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.

Frequently asked questions

224Z00000X questions

NPPES lists 43,239 registered providers whose primary or secondary taxonomy code is 224Z00000X (Occupational Therapy Assistant).

Both. About 4% of providers using 224Z00000X are registered as organizations and 96% as individuals.

Taxonomy code 224Z00000X does not map to a Medicare specialty code in the current crosswalk.

224Z00000X 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 occupational therapy assistant 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.