Taxonomy code 224Z00000X: Occupational Therapy Assistant

224Z00000X is the NUCC Health Care Provider Taxonomy code for Occupational Therapy Assistant, in the group Respiratory, Developmental, Rehabilitative and Restorative Service Providers. It is one of the codes a provider lists on the NPI application to tell CMS and payers what they do.

Code

224Z00000X

Grouping

Respiratory, Developmental, Rehabilitative and Restorative Service Providers

Classification

Occupational Therapy Assistant

Section

Individual

NUCC version

26.1

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.

NUCC notes: Source: The Guide to Occupational Therapy Practice, 2nd edition. Bethesda: American Occupational Therapy Association, 2007. [7/1/2008: definition changed, source changed]

Who uses this code

For COTAs.

Occupational therapists: Occupational Therapy Assistant (COTA).

Get an NPI with this taxonomy

Two free ways. SimpleNPI files the application for you, and a person confirms the taxonomy before filing; 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 Occupational Therapy Assistant

Code	Name
`224ZR0403X`	Occupational Therapy Assistant, Driving and Community Mobility
`224ZE0001X`	Occupational Therapy Assistant, Environmental Modification
`224ZF0002X`	Occupational Therapy Assistant, Feeding, Eating & Swallowing
`224ZL0004X`	Occupational Therapy Assistant, Low Vision

Questions

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 224Z00000X 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.