Taxonomy code 1223X0400X: Dentist, Orthodontics and Dentofacial Orthopedics

1223X0400X is the NUCC Health Care Provider Taxonomy code for Dentist, Orthodontics and Dentofacial Orthopedics, in the group Dental Providers. It is one of the codes a provider lists on the NPI application to tell CMS and payers what they do.

Code

1223X0400X

Grouping

Dental Providers

Classification

Dentist

Specialization

Orthodontics and Dentofacial Orthopedics

Section

Individual

NUCC version

26.1

Definition

That area of dentistry concerned with the supervision, guidance and correction of the growing or mature dentofacial structures, including those conditions that require movement of teeth or correction of malrelationships and malformations of their related structures and the adjustment of relationships between and among teeth and facial bones by the application of forces and/or the stimulation and redirection of functional forces within the craniofacial complex. Major responsibilities of orthodontic practice include the diagnosis, prevention, interception and treatment of all forms of malocclusion of the teeth and associated alterations in their surrounding structures; the design, application and control of functional and corrective appliances; and the guidance of the dentition and its supporting structures to attain and maintain optimum occlusal relations in physiologic and esthetic harmony among facial and cranial structures.

Who uses this code

Dentists: Orthodontics and Dentofacial Orthopedics.

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 Dentist

Code	Name
`122300000X`	Dentist
`1223D0004X`	Dentist, Dental Anesthesiology
`1223D0001X`	Dentist, Dental Public Health
`1223E0200X`	Dentist, Endodontics
`1223G0001X`	Dentist, General Practice
`1223P0106X`	Dentist, Oral and Maxillofacial Pathology
`1223X0008X`	Dentist, Oral and Maxillofacial Radiology
`1223S0112X`	Dentist, Oral and Maxillofacial Surgery
`125Q00000X`	Dentist, Oral Medicine
`1223X2210X`	Dentist, Orofacial Pain
`1223P0221X`	Dentist, Pediatric Dentistry
`1223P0300X`	Dentist, Periodontics

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 1223X0400X 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.