Taxonomy code 364S00000X: Clinical Nurse Specialist

364S00000X is the NUCC Health Care Provider Taxonomy code for Clinical Nurse Specialist, in the group Physician Assistants & Advanced Practice Nursing Providers. It is one of the codes a provider lists on the NPI application to tell CMS and payers what they do.

Code

364S00000X

Grouping

Physician Assistants & Advanced Practice Nursing Providers

Classification

Clinical Nurse Specialist

Section

Individual

NUCC version

26.1

Definition

A registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses and clinical experience, is expert in a specialty area of nursing practice within one or more of the components of direct patient/client care, consultation, education, research and administration.

NUCC notes: Sources: American Nurses Association, American Nurses Credentialing Center, 1996 Certification Catalogue and The Interagency Conference on Nursing Statistics.

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 Clinical Nurse Specialist

Code	Name
`364SA2100X`	Clinical Nurse Specialist, Acute Care
`364SA2200X`	Clinical Nurse Specialist, Adult Health
`364SC2300X`	Clinical Nurse Specialist, Chronic Care
`364SC1501X`	Clinical Nurse Specialist, Community Health/Public Health
`364SC0200X`	Clinical Nurse Specialist, Critical Care Medicine
`364SE0003X`	Clinical Nurse Specialist, Emergency
`364SE1400X`	Clinical Nurse Specialist, Ethics
`364SF0001X`	Clinical Nurse Specialist, Family Health
`364SG0600X`	Clinical Nurse Specialist, Gerontology
`364SH1100X`	Clinical Nurse Specialist, Holistic
`364SH0200X`	Clinical Nurse Specialist, Home Health
`364SI0800X`	Clinical Nurse Specialist, Informatics

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 364S00000X 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.