An RD is a registered dietitian, a food and nutrition expert who has completed a specific set of education, training, and examination requirements. The credential is issued by the Commission on Dietetic Registration (CDR), and you may also see it written as RDN (registered dietitian nutritionist). Both titles refer to the same certification and the same qualifications.
What It Takes to Become an RD
As of January 1, 2024, anyone becoming eligible for the registration exam for the first time needs a graduate degree (master’s or higher) from an accredited institution. Before that date, a bachelor’s degree was sufficient. RDs who earned their credential under the old requirement don’t need to go back for a master’s.
Beyond the degree, candidates must complete at least 1,000 hours of supervised practice through an accredited program. These hours can come through a dietetic internship, a coordinated program that blends coursework and clinical training, or a graduate program that integrates both. The supervised practice spans settings like hospitals, community health centers, and food service operations, giving future RDs hands-on experience before they ever work independently.
After finishing their education and supervised hours, candidates sit for a national registration exam. Passing it earns the RD credential. To keep it, dietitians must complete continuing education throughout their careers.
How an RD Differs From a Nutritionist
The distinction matters because the title “nutritionist” has inconsistent legal protection. In many states, anyone can call themselves a nutritionist regardless of training. The title “registered dietitian,” by contrast, is always tied to the CDR credential and its education, practice, and exam requirements.
Most states have enacted laws regulating who can practice dietetics. Licensing statutes typically include title protection, which prevents unlicensed individuals from calling themselves a dietitian or nutritionist. Many states go further with practice exclusivity clauses that limit the ability of unlicensed people to provide nutrition services that fall within the dietitian’s defined scope of practice. A handful of states, including Arizona, California, Colorado, Michigan, and Virginia, currently have no dietetics licensure statute on the books, meaning regulation in those states is lighter or nonexistent at the state level.
The practical takeaway: if you see “RD” or “RDN” after someone’s name, you know they’ve met a nationally standardized set of qualifications. The word “nutritionist” alone doesn’t guarantee any particular level of training unless the state where that person practices requires it.
Where Registered Dietitians Work
Hospitals are the single largest employer, accounting for about 26% of dietitians. But the profession extends well beyond hospital walls. Roughly 12% are self-employed, often running private practices. About 11% work for government agencies, 9% work in nursing and residential care facilities, and 7% work in outpatient care centers.
Within those settings, RDs tend to fall into a few broad categories. Clinical dietitians work directly with patients in hospitals, long-term care facilities, clinics, or private practice, designing nutrition plans around specific medical conditions. Community dietitians focus on public health, working in clinics, government agencies, nonprofits, and HMOs to improve nutrition at a population level. Management dietitians oversee food service operations in places like school cafeterias, hospitals, and prisons.
Specialty Certifications
After gaining experience, RDs can pursue board-certified specialist credentials in focused areas. CDR currently offers specialist certifications in eight fields:
- Sports dietetics
- Pediatric nutrition
- Pediatric critical care nutrition
- Renal nutrition (kidney disease)
- Oncology nutrition (cancer care)
- Gerontological nutrition (older adults)
- Obesity and weight management
- Digestive health
These certifications signal deeper expertise in a particular area and require additional practice experience and a specialty exam beyond the baseline RD credential.
Insurance Coverage for RD Services
Whether insurance covers visits with an RD depends on your plan and your diagnosis. Medicare covers what’s called medical nutrition therapy for people with diabetes, kidney disease, or a kidney transplant within the past 36 months. A doctor must provide a referral. The initial year includes 3 hours of services at no cost to the patient, followed by up to 2 additional hours each year after that. If your condition changes, your doctor can refer you for more hours.
Medicare requires that these services be delivered by a registered dietitian or a nutrition professional who meets equivalent qualifications. Many private insurance plans also cover RD visits for specific conditions, though the details vary widely. If you’re considering seeing an RD, checking with your insurance plan first will save you from unexpected bills.
Through January 2026, Medicare allows medical nutrition therapy via telehealth from any location in the U.S. After that date, telehealth access narrows to patients in rural areas who connect from a medical facility, also in a rural area.