Dietary & Nutritional Service Providers / 133N00000X
Individual · classification
133N00000X Nutritionist
133N00000X is the taxonomy code for Nutritionist, in the NUCC group “Dietary & Nutritional Service Providers”. It is a code for individual providers — the kind used on a Type 1 NPI. It has no entry in the CMS Medicare taxonomy crosswalk.
- 1Taxonomy code 133N00000X
- 2Level Classification
- 3Medicare specialty Not in the crosswalk
- 4Codes in this group 13
Definition
A specialist in adapting and applying food and nutrient knowledge to the solution of food and nutritional problems, the control of disease, and the promotion of health. Nutritionists perform research, instruct groups and individuals about nutritional requirements, and assist people in developing meal patterns that meet their nutritional needs; (2) A nutritionist is someone who has completed undergraduate and/or graduate training in the discipline of nutrition without necessarily meeting the academic and experience requirements to qualify for the Registered Dietitian designation.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 133N00000X sits
- Group: Dietary & Nutritional Service Providers — code 12 of 13 in the group
- Classification: Nutritionist 133N00000X
This is the general code for Nutritionist. 1 more specific code 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
133N00000X has no entry in the CMS Medicare Provider and Supplier Taxonomy Crosswalk. That usually means Medicare does not enroll this kind of provider under its own specialty — the provider can still hold an NPI and use this code on claims to other payers.
Related codes
| Code | Nutritionist — specializations |
|---|---|
| 133NN1002X | Nutrition, Education |
History of 133N00000X
NUCC's notes record no dated changes for 133N00000X. 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.
Find providers with 133N00000X
Using 133N00000X
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). Checked 2026-10-24. Methodology.