133VN1301X Oncology Nutrition Registered Dietitian

Definition

An individual who is a Board Certified Specialist in Oncology Nutrition and provides direct nutrition care for individuals at risk for or diagnosed with cancer. RDNs working directly with individuals at risk for, or diagnosed with, any type of malignancy or pre-malignant condition, in a variety of settings (e.g. hospitals, clinics, cancer centers, hospices, public health), OR indirectly through roles in management, education, industry, and research practice linked specifically to oncology nutrition. RDN who works indirectly with oncology nutrition through roles in management, education, industry, and research.

— NUCC Health Care Provider Taxonomy, version 26.1

Where 133VN1301X sits

• Group: Dietary & Nutritional Service Providers — code 7 of 13 in the group
• Classification: Dietitian, Registered 133V00000X
• Specialization: Nutrition, Oncology 133VN1301X

Choose 133VN1301X over the general Dietitian, Registered code (133V00000X) when the provider's training or certification is specifically in nutrition, 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 133VN1301X to Medicare specialty 71 (Registered Dietitian or Nutrition Professional). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 11,323 practitioners are enrolled under it nationally, and 8 other taxonomy codes map to the same specialty.

Other codes under the same Medicare specialty: 133V00000X Registered Dietitian; 133VN1004X Pediatric Nutrition Registered Dietitian; 133VN1005X Renal Nutrition Registered Dietitian; 133VN1006X Metabolic Nutrition Registered Dietitian; 133VN1101X Gerontological Nutrition Registered Dietitian; 133VN1201X Obesity and Weight Management Nutrition Registered Dietitian; 133VN1401X Pediatric Critical Care Nutrition Registered Dietitian; 133VN1501X Sports Dietetics Nutrition Registered Dietitian.

Related codes

The nearest 6 of 8 other codes under Dietitian, Registered; all are on the group page.

History of 133VN1301X

133VN1301X was added to the code set in 2019.

• 2019-07-01 — new

Similar codes in other groups

If 133VN1301X 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:

• 207LP4000X Physician Nutrition Specialist (Anesthesiology) (Allopathic & Osteopathic Physicians)
• 207QP0002X Physician Nutrition Specialist (Family Medicine) (Allopathic & Osteopathic Physicians)
• 207RH0003X Hematology & Oncology Physician (Allopathic & Osteopathic Physicians)
• 207RX0202X Medical Oncology Physician (Allopathic & Osteopathic Physicians)
• 207RP1002X Physician Nutrition Specialist (Internal Medicine) (Allopathic & Osteopathic Physicians)
• 207VX0201X Gynecologic Oncology Physician (Allopathic & Osteopathic Physicians)

Using 133VN1301X

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.