Physician Assistants & Advanced Practice Nursing Providers / 364S00000X
Individual · classification · Medicare specialty 89
364S00000X Clinical Nurse Specialist
364S00000X is the taxonomy code for Clinical Nurse Specialist, in the NUCC group “Physician Assistants & Advanced Practice Nursing Providers”. It is a code for individual providers — the kind used on a Type 1 NPI. Medicare maps it to specialty 89, Certified Clinical Nurse Specialist, under which 2,230 practitioners are enrolled.
- 1Taxonomy code 364S00000X
- 2Level Classification
- 3Medicare specialty 89 Certified Clinical Nurse Specialist
- 4Codes in this group 58
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 Health Care Provider Taxonomy, version 26.1
Where 364S00000X sits
- Group: Physician Assistants & Advanced Practice Nursing Providers — code 3 of 58 in the group
- Classification: Clinical Nurse Specialist 364S00000X
This is the general code for Clinical Nurse Specialist. 33 more specific codes sit beneath it; pick one of those when the provider's training or certification matches it, and this one otherwise. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
CMS's taxonomy crosswalk links 364S00000X to Medicare specialty 89 (Certified Clinical Nurse Specialist). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 2,230 practitioners are enrolled under it nationally, and 33 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 364SA2100X Acute Care Clinical Nurse Specialist; 364SA2200X Adult Health Clinical Nurse Specialist; 364SC0200X Critical Care Medicine Clinical Nurse Specialist; 364SC1501X Community Health/Public Health Clinical Nurse Specialist; 364SC2300X Chronic Care Clinical Nurse Specialist; 364SE0003X Emergency Clinical Nurse Specialist; 364SE1400X Ethics Clinical Nurse Specialist; 364SF0001X Family Health Clinical Nurse Specialist; and 25 more.
Related codes
| Code | Clinical Nurse Specialist — specializations |
|---|---|
| 364SA2100X | Acute Care |
| 364SA2200X | Adult Health — Medicare 89 Certified Clinical Nurse Specialist |
| 364SC2300X | Chronic Care |
| 364SC1501X | Community Health/Public Health |
| 364SC0200X | Critical Care Medicine |
| 364SE0003X | Emergency |
| 364SE1400X | Ethics |
| 364SF0001X | Family Health |
| 364SG0600X | Gerontology |
| 364SH1100X | Holistic |
| 364SH0200X | Home Health |
| 364SI0800X | Informatics |
| 364SL0600X | Long-Term Care |
| 364SM0705X | Medical-Surgical |
| 364SN0000X | Neonatal |
| 364SN0800X | Neuroscience |
| 364SX0106X | Occupational Health |
| 364SX0200X | Oncology — Medicare 89 Certified Clinical Nurse Specialist |
| 364SX0204X | Oncology, Pediatrics — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0200X | Pediatrics — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP1700X | Perinatal |
| 364SP2800X | Perioperative |
| 364SP0808X | Psychiatric/Mental Health — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0809X | Psychiatric/Mental Health, Adult — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0807X | Psychiatric/Mental Health, Child & Adolescent — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0810X | Psychiatric/Mental Health, Child & Family — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0811X | Psychiatric/Mental Health, Chronically Ill — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0812X | Psychiatric/Mental Health, Community — Medicare 89 Certified Clinical Nurse Specialist |
| 364SP0813X | Psychiatric/Mental Health, Geropsychiatric — Medicare 89 Certified Clinical Nurse Specialist |
| 364SR0400X | Rehabilitation |
| 364SS0200X | School |
| 364ST0500X | Transplantation |
| 364SW0102X | Women's Health |
History of 364S00000X
NUCC's notes record no dated changes for 364S00000X. The code set is republished every January and July, when codes are added, retitled or marked inactive; this page reflects version 26.1, so check the NUCC site if you are reading it after the next release.
Similar codes in other groups
If 364S00000X is not quite right, these codes in other groups share a word with it — often the same field practised by a different kind of provider:
- 207KI0005X Clinical & Laboratory Immunology (Allergy & Immunology) Physician (Allopathic & Osteopathic Physicians)
- 208U00000X Clinical Pharmacology Physician (Allopathic & Osteopathic Physicians)
- 207NI0002X Clinical & Laboratory Dermatological Immunology Physician (Allopathic & Osteopathic Physicians)
- 207RI0001X Clinical & Laboratory Immunology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians)
- 207RC0001X Clinical Cardiac Electrophysiology Physician (Allopathic & Osteopathic Physicians)
- 207SG0202X Clinical Biochemical Genetics Physician (Allopathic & Osteopathic Physicians)
Find providers with 364S00000X
Using 364S00000X
The code goes in the taxonomy field of the NPI application in NPPES, and on claims where a payer asks for it — box 24J (shaded) or 33b on the CMS-1500 with the ZZ qualifier, or the PRV segment of an 837 electronic claim. Payers match it against the taxonomy on the NPI record and, for Medicare, against the specialty on the enrollment, so all three should agree. To see which code a provider uses, search their NPI in the lookup.
Sources: NUCC Health Care Provider Taxonomy code set, version 26.1 (CSV); CMS Medicare Provider and Supplier Taxonomy Crosswalk, August 2026; CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29. Checked 2026-10-24. Methodology.