Physician Assistants & Advanced Practice Nursing Providers / 363LX0001X
Individual · specialization · Medicare specialty 50
363LX0001X Obstetrics & Gynecology Nurse Practitioner
363LX0001X is the taxonomy code for Obstetrics & Gynecology, a specialization of Nurse Practitioner, 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 50, Nurse Practitioner, under which 365,671 practitioners are enrolled.
- 1Taxonomy code 363LX0001X
- 2Level Specialization
- 3Medicare specialty 50 Nurse Practitioner
- 4Codes in this group 58
Definition
NUCC publishes no definition for 363LX0001X; the code is identified by its place in the tree below.
Where 363LX0001X sits
- Group: Physician Assistants & Advanced Practice Nursing Providers — code 47 of 58 in the group
- Classification: Nurse Practitioner 363L00000X
- Specialization: Obstetrics & Gynecology 363LX0001X
Choose 363LX0001X over the general Nurse Practitioner code (363L00000X) when the provider's training or certification is specifically in obstetrics & gynecology; 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 363LX0001X to Medicare specialty 50 (Nurse Practitioner). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 365,671 practitioners are enrolled under it nationally, and 17 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 363L00000X Nurse Practitioner; 363LA2100X Acute Care Nurse Practitioner; 363LA2200X Adult Health Nurse Practitioner; 363LC0200X Critical Care Medicine Nurse Practitioner; 363LC1500X Community Health Nurse Practitioner; 363LF0000X Family Nurse Practitioner; 363LG0600X Gerontology Nurse Practitioner; 363LN0000X Neonatal Nurse Practitioner; and 9 more.
Related codes
| Code | Nurse Practitioner — other specializations |
|---|---|
| 363LG0600X | Gerontology |
| 363LN0000X | Neonatal |
| 363LN0005X | Neonatal, Critical Care — Medicare 50 Nurse Practitioner |
| 363LX0106X | Occupational Health |
| 363LP0200X | Pediatrics |
| 363LP0222X | Pediatrics, Critical Care — Medicare 50 Nurse Practitioner |
The nearest 6 of 17 other codes under Nurse Practitioner; all are on the group page.
History of 363LX0001X
NUCC's notes record no dated changes for 363LX0001X. 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 363LX0001X 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:
- 207V00000X Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians)
- 207VG0400X Gynecology Physician (Allopathic & Osteopathic Physicians)
- 207VX0000X Obstetrics Physician (Allopathic & Osteopathic Physicians)
Find providers with 363LX0001X
Using 363LX0001X
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.