Dietitian Licensing Glossary
Dietitian credentialing and licensing involves both a national credential and, in most states, a separate state license — with its own terminology. This glossary defines the key terms you’ll encounter earning your RD/RDN credential and getting licensed in your state.
A
ACEND (Accreditation Council for Education in Nutrition and Dietetics)
The body that accredits dietetics education programs in the US, operating under the Academy of Nutrition and Dietetics. To be eligible for the CDR Registration Examination for Dietitians, a candidate must complete both academic coursework and supervised practice through an ACEND-accredited program (or an equivalent foreign-credentialed pathway).
Academy of Nutrition and Dietetics (the Academy)
The national professional organization for dietitians and nutrition professionals in the US. ACEND (accreditation) and CDR (credentialing) both operate under the Academy, though each functions as a distinct body with its own standards.
C
CDN (Certified Dietitian-Nutritionist)
A state-specific credential used in some states (notably New York) as the title for a state-licensed or state-certified dietitian/nutritionist. Requirements to hold a CDN typically track the national CDR RD/RDN standard, but the CDN title itself is issued by the state, not by CDR.
CDR (Commission on Dietetic Registration)
The national credentialing body that administers the Registration Examination for Dietitians and issues the RD/RDN credential. CDR sets the national eligibility standard (degree, supervised practice, exam) that applies the same way regardless of which state you plan to practice in — separate from any additional state licensing requirements.
Coordinated Program (CP)
An ACEND-accredited dietetics education pathway that combines the academic coursework (didactic program) and supervised-practice hours into a single integrated program, rather than requiring students to apply separately to a supervised-practice program after finishing coursework.
CPEU (Continuing Professional Education Unit)
CDR's unit of credit for the continuing education RD/RDN credential holders must complete to maintain their national registration. This is separate from — though sometimes accepted toward — a state's own continuing-education hour requirement for license renewal.
D
DICAS (Dietetic Internship Centralized Application Service)
The centralized online application portal most dietetics students use to apply to ACEND-accredited supervised-practice programs (dietetic internships), similar in function to a common application used across multiple programs.
Dietetic Internship (DI)
An ACEND-accredited supervised-practice program completed after (or, in a Coordinated Program, alongside) the academic coursework portion of dietetics education. Rotations typically span clinical nutrition, community/public health nutrition, and foodservice management settings, and completing one is required before sitting for the CDR Registration Examination for Dietitians.
DPD (Didactic Program in Dietetics)
The ACEND-accredited academic coursework portion of dietetics education — covering biochemistry, physiology, food science, and clinical nutrition — typically completed before applying to a separate supervised-practice program (dietetic internship), unless a student is enrolled in a Coordinated Program that bundles the two together.
DTR / NDTR (Dietetic Technician, Registered)
A related national credential, also issued by CDR, for dietetic technicians who complete an ACEND-accredited associate or bachelor's-level program and pass a separate CDR exam. A DTR/NDTR works under the supervision of an RD/RDN in many settings and is a distinct credential from the RD/RDN itself.
E
Endorsement (Licensure by Endorsement)
A state licensing pathway that waives some or all of a state's own education, supervised-practice, and exam requirements for applicants who already hold a current national credential — in dietetics, typically a current CDR RD/RDN registration. Because the RD/RDN is a single national credential rather than a state-issued one, most licensing states use endorsement (not pairwise reciprocity) as their out-of-state pathway. See our practicing-across-states explainer for which states in our dataset offer it.
See the endorsement explainer→J
Jurisprudence Exam
A short, state-specific exam covering that state's dietetics statutes and regulations, required by some states (for example, Texas) in addition to the national CDR credential — even for applicants using an endorsement pathway. It's a smaller add-on requirement, not a repeat of the national Registration Examination for Dietitians.
L
LD (Licensed Dietitian)
A state-issued professional title used by states that license dietitians as a standalone credential distinct from "nutritionist." The specific requirements to earn an LD title vary by state but commonly track the national CDR RD/RDN standard.
LD/N (Licensed Dietitian/Nutritionist)
A combined state title used by states (for example, Florida) that license "dietitian" and "nutritionist" together under a single credential, rather than treating them as separate regulated titles.
Licensing Board
The state agency responsible for regulating dietitian licensure where a state requires one. Licensing boards set requirements, review applications, issue licenses, and handle complaints. Board names and administering departments vary by state — some states house dietitian licensing within a medical board, a department of health, or a dedicated licensing agency.
M
MNT (Medical Nutrition Therapy)
A nutrition-based clinical treatment used to manage a specific medical condition — for example, dietary management of diabetes, kidney disease, or cardiovascular conditions — typically provided by a registered dietitian as part of a patient's overall care plan. Some states' scope-of-practice statutes specifically name MNT as part of what a licensed dietitian is authorized to provide.
N
National Credential vs. State License
A key distinction on this site: the RD/RDN credential is issued once, nationally, by CDR, and doesn't vary by state. A state license (where required) is a separate, additional authorization to use a protected title or practice within that specific state, issued by that state's own licensing board. Holding the national credential doesn't automatically grant you every state's license — though many states streamline the process via endorsement.
Non-Licensing State
A state that does not operate a dietitian licensing board, application process, or renewal cycle at all. Examples include California and Colorado — practitioners there rely on the national RD/RDN credential and, in some cases, a narrower state title-protection or anti-fraud statute rather than a formal license.
Nutritionist
A much less consistently regulated term than "dietitian." In many states, anyone can call themselves a nutritionist regardless of credential; a smaller number of states separately license or restrict the term, sometimes combining it with the dietitian title (see LD/N) and sometimes regulating it as a distinct license category. Check each state's page for how "nutritionist" is specifically treated there.
P
Preprofessional / Supervised Practice
The hands-on training component of dietetics education, completed through an ACEND-accredited program (a dietetic internship or a Coordinated Program) before a candidate is eligible for the CDR Registration Examination for Dietitians. The specific hour requirement is set by each accredited program under ACEND standards and can vary by program.
Provisional License
A temporary license some states issue to an applicant who has met most, but not all, requirements — for example, someone awaiting exam results or completing final supervised-practice hours — allowing limited practice under supervision until the full license requirements are met.
R
RD (Registered Dietitian)
The national credential issued by CDR to individuals who complete an ACEND-accredited degree and supervised-practice program and pass the Registration Examination for Dietitians. RD and RDN refer to the same underlying credential — RDN is an optional, equivalent title.
RDN (Registered Dietitian Nutritionist)
An alternate, equivalent title to RD, introduced by CDR to clarify the nutrition scope of the credential. Credential holders may use either RD or RDN interchangeably — both represent the same national registration.
Reciprocity
A pairwise arrangement in which two states specifically agree to recognize each other's licenses. Dietitian licensure generally doesn't work this way — because the RD/RDN credential is issued once, nationally, by CDR, most licensing states use endorsement (a one-directional pathway from the national credential into that state's license) rather than negotiating state-to-state reciprocity agreements.
See how endorsement works instead→Registration Examination for Dietitians
The national computer-based exam administered by CDR (via Pearson VUE testing centers) that a candidate must pass to earn the RD/RDN credential. It is a single, one-time national exam — most states that also require a state license do not make you retake it, though some layer on a short state-specific exam (see Jurisprudence Exam).
S
Scope of Practice
The specific set of professional activities (such as nutrition assessment, nutrition counseling, or medical nutrition therapy) that a state's dietetics statute authorizes a licensed dietitian to perform. Scope-of-practice language varies by state and is typically defined in the same statute chapter that creates the license itself.
T
Title Protection
A legal restriction on who may use a specific professional title — for example, "dietitian" or "RD" — regardless of whether the state also operates a full licensing process. Some states combine title protection with a full license; others (including some non-licensing states in our dataset) protect a title through a narrower statute without a licensing board, application, or renewal process behind it.