Physician Assistants & Advanced Practice Nursing Providers / 364SA2100X
Individual · specialization · Medicare specialty 89
364SA2100X Acute Care Clinical Nurse Specialist
364SA2100X is the taxonomy code for Acute Care, a specialization of 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 364SA2100X
- 2Level Specialization
- 3Medicare specialty 89 Certified Clinical Nurse Specialist
- 4Codes in this group 58
Definition
NUCC publishes no definition for 364SA2100X; the code is identified by its place in the tree below.
Where 364SA2100X sits
- Group: Physician Assistants & Advanced Practice Nursing Providers — code 4 of 58 in the group
- Classification: Clinical Nurse Specialist 364S00000X
- Specialization: Acute Care 364SA2100X
Choose 364SA2100X over the general Clinical Nurse Specialist code (364S00000X) when the provider's training or certification is specifically in acute care; the general code covers the classification as a whole. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
CMS's taxonomy crosswalk links 364SA2100X 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: 364S00000X 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 — other specializations |
|---|---|
| 364S00000X | Clinical Nurse Specialist |
| 364SA2200X | Adult Health — Medicare 89 Certified Clinical Nurse Specialist |
| 364SC2300X | Chronic Care |
| 364SC1501X | Community Health/Public Health |
The nearest 4 of 33 other codes under Clinical Nurse Specialist; all are on the group page.
History of 364SA2100X
NUCC's notes record no dated changes for 364SA2100X. 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 364SA2100X 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:
- 282N00000X General Acute Care Hospital (Hospitals)
- 2865M2000X Military General Acute Care Hospital (Hospitals)
- 2865X1600X Operational (Transportable) Military General Acute Care Hospital (Hospitals)
Find providers with 364SA2100X
Using 364SA2100X
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.