Getting an Illinois LDN License

Illinois licenses dietitians as Licensed Dietitian Nutritionists, or LDNs, under the Dietitian Nutritionist Practice Act (225 ILCS 30). The Illinois Department of Financial and Professional Regulation (IDFPR) administers it. Unlike states that only protect a title, Illinois restricts a core part of practice: "No person may provide, offer to provide, or attempt to provide medical nutrition therapy, whether for remuneration, or hold himself or herself out as a licensed dietitian nutritionist ... unless the person is licensed in accordance with this Act" (Sec. 15(a)).

The act also defines the practice of dietetics and nutrition to include nutrition care services "in person and via telehealth," so an RDN outside Illinois who provides medical nutrition therapy to Illinois patients is inside the law's reach.

What does the Illinois license protect?

Two things. First, medical nutrition therapy, which Sec. 15 reserves to licensees. Second, the titles. Only a licensee may use "licensed dietitian nutritionist," "dietitian nutritionist," or "dietitian," or the letters "L.D.N." (Sec. 80(a)). The act adds that an earned, federally trademarked nutrition credential may still be used, but "such use does not give an individual the right to practice dietetics or nutrition or provide medical nutrition therapy unless the individual is licensed under this Act" (Sec. 80(c)). Your RDN tells Illinois what you are qualified to do; the LDN is what lets you do the regulated part there.

The current wording dates from Public Act 102-945, effective January 1, 2023. Under Sec. 76, anyone licensed as a dietitian on that date may keep and renew the license as a licensed dietitian nutritionist.

Is there a way to start before the license issues?

Yes, and it is one of the most useful provisions in any state's dietitian law. Sec. 15(b) says the license requirement does not prohibit medical nutrition therapy by "a person who is licensed to practice dietetics and nutrition under the law of another state, territory of the United States, or country and has applied in writing to the Department" for an Illinois license, until the earliest of:

1. six months after filing the written application;
2. withdrawal of the application; or
3. denial of the application.

The bridge depends on holding a license elsewhere. An RDN whose only credential is the RD, for example a California resident, does not fit the wording. And the clock starts at filing, so a slow file can run past six months before the license issues. For telehealth employers onboarding RDNs into Illinois, this window matters, and our post on what telehealth companies expect covers how.

What are the qualifications for an Illinois LDN?

Under Sec. 45, an applicant needs:

• a bachelor's or higher degree in human nutrition, foods and nutrition, dietetics, nutrition science, clinical nutrition or one of several other listed majors, from an accredited program, with education leading to competence in medical nutrition therapy;
• a passing score on an exam the Department authorizes, which may include the exams of the Commission on Dietetic Registration, the Certification Board for Nutrition Specialists, or the American Clinical Board of Nutrition; and
• a dietetic internship or at least 900 hours of supervised practice experience that includes training in medical nutrition therapy.

The Department must provide by rule an exam waiver for applicants who, at the time of application, are registered dietitians with CDR, certified nutrition specialists, or diplomates of the American Clinical Board of Nutrition and who meet the other qualifications. That is the route most RDNs use.

How does endorsement work in Illinois?

Sec. 75 lets the Department, "in its discretion," license without examination an applicant who is a dietitian, dietitian nutritionist or nutritionist licensed or certified in another state, territory or country, if the requirements there "were, at the date of his or her licensure, substantially equal to the requirements of this Act." Note the timing: the comparison is with the other state's rules on the day you were licensed, not today.

The same section sets a deadline that catches people: "An applicant has 3 years from the date of application to complete the application process." After that, the application is denied, the fee is forfeited and you start over under the rules then in effect. Our guide to license by endorsement compares Illinois with other states.

When does an Illinois LDN renew?

On a fixed statewide date. IDFPR's rule says licenses "shall expire on October 31 of each odd-numbered year," and renewal requires 30 hours of continuing education (68 Ill. Adm. Code 1245.300). The next deadline is October 31, 2027. If you are licensed in 2026, your first license period is short, so plan your hours early. Practicing on an expired or inactive license is treated as unlicensed practice under the same rule.

The fee schedule is set by rule and the fees are not refundable (Sec. 85). Check IDFPR's current schedule before applying.

Is the Illinois act scheduled to end in 2028?

Each section of the act carries the note "Section scheduled to be repealed on January 1, 2028." Unless the General Assembly extends the act, the license framework lapses on that date. Our post on the Illinois dietitian act's 2028 sunset tracks it.

Does the Dietitian Compact help Illinois dietitians?

No. Illinois has not joined the compact, so an Illinois resident cannot use it for practice elsewhere, and an out-of-state RDN cannot use it to practice in Illinois. No state issues compact privileges yet in any case. See which states have joined the Dietitian Compact.

How can we help with an Illinois LDN?

If you hold a license in another state, the first job is getting a complete written application on file, which starts the six-month window. Our License by Endorsement (RDN) service is $599 per state: we confirm your route, prepare the IDFPR application for your review, request verifications and CDR proof, and track the file against both the six-month bridge and the three-year limit. You sign, pay IDFPR and submit. If you are on a nutritionist or other non-RD route, the Full State License Application is $749 per state. State fees are separate. The Illinois state page has the summary.