Registered Dietitian
73,784 active US providers register Registered Dietitian as their primary taxonomy. That is 0.8% of every provider in the registry, and the 34th largest of 584 specialties with a page here.
- Taxonomy code
- 133V00000X
- Grouping
- Dietary & Nutritional Service Providers
- Classification
- Dietitian, Registered
- Active providers
- 73,784
- States covered
- 51 of 51
What the code means
A Registered Dietitian (RD)/Registered Dietitian Nutritionist (RDN) is an individual uniquely trained in the science of nutrition and practice of dietetics to design and provide medical nutrition therapy (MNT) and other evidence-based applications of the Nutrition Care Process (NCP) that exemplify the profession's systematic approach to providing high quality nutrition care. Registered dietitians provide MNT for the purpose of disease prevention or management, or to treat or rehabilitate an illness, injury, or condition, with the use of specific, indicated physical and cognitive nutrition care services comprised of one or more of the following aspects of the NCP: nutrition assessment/reassessment, nutrition diagnosis, nutrition intervention (e.g., nutrition counseling, therapeutic diet ordering, and nutrition education) and nutrition monitoring and evaluation.
Definition quoted verbatim from the NUCC Health Care Provider Taxonomy code set, version 25.1. Not paraphrased.
Where they are
Counted by practice location, not by mailing address or by licence state. A provider practising across a state line is counted where they practise.
| State | Providers | Share |
|---|---|---|
| California | 7,513 | |
| Texas | 5,566 | |
| New York | 5,165 | |
| Florida | 3,769 | |
| Pennsylvania | 3,416 | |
| Illinois | 3,089 | |
| North Carolina | 2,962 | |
| Ohio | 2,680 | |
| Massachusetts | 2,528 | |
| New Jersey | 2,352 | |
| Washington | 2,307 | |
| Michigan | 1,932 | |
| Georgia | 1,670 | |
| Minnesota | 1,649 | |
| Arizona | 1,557 |
Showing the 15 largest of 51 states with at least one.
Who registers under this code
67,794 of these are people and 5,990 are organisations, so 8% of the code is businesses rather than clinicians. Half of them had registered by 2018, and 27,004 registered in the last five years, 37% of the current population.
That is close to the pace of the registry as a whole.
Where the practices are
By practice-location city. City counts are noisier than state counts, because a large employer files one address for many providers.
- AUSTIN, TX1,092
- NEW YORK, NY1,040
- CHICAGO, IL1,026
- SEATTLE, WA656
- HOUSTON, TX584
- SAN DIEGO, CA516
- LOS ANGELES, CA506
- BROOKLYN, NY492
- SAN FRANCISCO, CA446
- PHOENIX, AZ442
What else they list
Providers whose primary code is Registered Dietitian most often carry these secondary taxonomies as well. This is the closest thing the registry has to a map of which specialties overlap in practice, and it is not published anywhere else.
| Also listed | Providers | Share |
|---|---|---|
| Nutritionist | 1,268 | 1.7% |
| Nutrition Education Nutritionist | 812 | 1.1% |
| Pediatric Nutrition Registered Dietitian | 673 | 0.9% |
| Metabolic Nutrition Registered Dietitian | 566 | 0.8% |
| Renal Nutrition Registered Dietitian | 493 | 0.7% |
| Obesity and Weight Management Nutrition Registered Dietitian | 415 | 0.6% |
| Sports Dietetics Nutrition Registered Dietitian | 226 | 0.3% |
| Lactation Consultant (Non-RN) | 220 | 0.3% |
Nearby specialties
Other taxonomies NUCC files under Dietitian, Registered.
- Pediatric Nutrition Registered Dietitian1,378
- Metabolic Nutrition Registered Dietitian878
- Renal Nutrition Registered Dietitian680
- Obesity and Weight Management Nutrition Registered Dietitian477
- Sports Dietetics Nutrition Registered Dietitian266
Looking up a specific provider
These counts come from the monthly NPPES file. To check one provider, use their NPI: the lookup reads the live registry and shows whether the identifier is still active, which the monthly file cannot tell you about the last few weeks.
Counts from npidata_pfile_20050523-20260712.csv, built 2026-08-09. Primary taxonomy only, deactivated identifiers excluded.