Allopathic & Osteopathic Physicians / 2085R0001X
Individual · specialization · Medicare specialty 92
2085R0001X Radiation Oncology Physician
2085R0001X is the taxonomy code for Radiation Oncology, a specialization of Radiology, in the NUCC group “Allopathic & Osteopathic Physicians”. It is a code for individual providers — the kind used on a Type 1 NPI. Medicare maps it to specialty 92, Physician/Radiation Oncology, under which 5,892 practitioners are enrolled.
- 1Taxonomy code 2085R0001X
- 2Level Specialization
- 3Medicare specialty 92 Physician/Radiation Oncology
- 4Codes in this group 238
Definition
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 2085R0001X sits
- Group: Allopathic & Osteopathic Physicians — code 220 of 238 in the group
- Classification: Radiology
- Specialization: Radiation Oncology 2085R0001X
Choose 2085R0001X over the general Radiology code when the provider's training or certification is specifically in radiation oncology; 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 2085R0001X to Medicare specialty 92 (Physician/Radiation Oncology). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 5,892 practitioners are enrolled under it nationally.
Related codes
| Code | Radiology — other specializations |
|---|---|
| 2085N0700X | Neuroradiology |
| 2085N0904X | Nuclear Radiology |
| 2085P0229X | Pediatric Radiology |
| 2085R0205X | Radiological Physics |
| 2085R0203X | Therapeutic Radiology |
| 2085R0204X | Vascular & Interventional Radiology |
The nearest 6 of 11 other codes under Radiology; all are on the group page.
History of 2085R0001X
NUCC's earliest recorded change to 2085R0001X is from 2007 (definition added, source added), and has been revised 1 time since.
- 2007-07-01 — definition added, source added
- 2011-07-01 — modified source
Similar codes in other groups
If 2085R0001X 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:
- 133VN1301X Oncology Nutrition Registered Dietitian (Dietary & Nutritional Service Providers)
- 163WX0200X Oncology Registered Nurse (Nursing Service Providers)
- 163WP0218X Pediatric Oncology Registered Nurse (Nursing Service Providers)
- 1835X0200X Oncology Pharmacist (Pharmacy Service Providers)
- 364SX0200X Oncology Clinical Nurse Specialist (Physician Assistants & Advanced Practice Nursing Providers)
- 364SX0204X Pediatric Oncology Clinical Nurse Specialist (Physician Assistants & Advanced Practice Nursing Providers)
Find providers with 2085R0001X
Using 2085R0001X
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.