Insurance Billing

Can Dietitians Bill Incident-To? Medicare Rules

Medicare MNT can't be billed incident-to: the RD bills under her own NPI. Where incident-to does apply to dietitians (G0447) and the audit risk.

By Javier Alvarez · Published September 29, 2026 · 6 min read

Short answer: no. Under Medicare, medical nutrition therapy can't be billed incident-to a physician. CMS says it plainly in the Claims Processing Manual: MNT codes 97802, 97803 and 97804 "cannot be paid 'incident to' physician services" (Pub. 100-04, Ch. 4 §300.4). The registered dietitian enrolls in Medicare and bills MNT under her own NPI, even when she works inside a physician's office.

There is one real exception, and it isn't MNT: intensive behavioral therapy for obesity (G0447). Below we cover why the rule exists, how RDs employed by a practice should bill, where incident-to actually shows up, and what to do if a claim was billed the wrong way.

Why MNT can't go incident-to: it has its own benefit

Incident-to is a Medicare payment rule. It lets a physician (or NP or PA) bill for services that auxiliary staff provide under their direct supervision, as long as the services are an "integral, although incidental" part of the physician's own care (Benefit Policy Manual, Ch. 15 §60).

The same manual draws a line. Medicare contractors "must not apply incident to requirements to services having their own benefit category." Those services have to meet the requirements of their own benefit instead. The regulation says the same thing: incident-to covers services that are not "specifically listed in the Act as a separate benefit" (42 CFR 410.26).

MNT is one of those separate benefits. Congress created it in 2000 (BIPA §105), and it's the benefit that lets RDs bill Medicare directly. It comes with its own rules (42 CFR 410.130–410.134 and NCD 180.1):

• Who can provide it: a registered dietitian or nutrition professional who meets the federal definition and is enrolled in Medicare.
• Who qualifies: beneficiaries with diabetes or renal disease, referred by a physician. Renal disease includes the 36 months after a kidney transplant. Patients on maintenance dialysis are excluded.
• How much: 3 hours in the first calendar year and 2 hours in later years, with a new referral each year. More hours are allowed after a documented change in condition, billed with G0270/G0271.
• How it's paid: the lesser of the actual charge or 85% of the physician fee schedule amount. RDs must accept assignment (Ch. 4 §300.3–300.4).

An MNT visit billed incident-to fails that benefit's own tests. The claim names the wrong rendering provider, it gets paid at the physician rate instead of the 85% RD rate, and it hides who actually delivered the service. The full rules for billing the benefit correctly are in our Medicare MNT billing guide.

"But I work for the doctor." How employed RDs bill MNT

Working inside a physician practice doesn't change the answer. What changes is who gets paid, not whose NPI is the rendering provider.

1. You enroll in Medicare as an individual. You get a PTAN tied to your own NPI; the walkthrough is in Medicare enrollment for dietitians.
2. You reassign your benefits to the group. The practice bills under its Type 2 NPI and receives the payment. If NPI types are fuzzy, see NPI Type 1 vs. Type 2.
3. Each MNT claim lists you as the rendering provider. CMS says that when an RD is part of a group, the RD's own identifier goes on the claim (Ch. 4 §300.5).
4. The physician appears on the claim as the referring provider. The referring physician's NPI is required on Medicare MNT claims. A claim without it is returned (Ch. 4 §300.2). A clean referral saves you from this; our MNT referral form template covers the fields.

Hospitals are the other legitimate setup. The manual lets a hospital bill MNT when the RD has reassigned her benefits to it, but it's still the RD's service billed under the MNT benefit, not incident-to.

Where incident-to does show up for dietitians: G0447

Intensive behavioral therapy (IBT) for obesity is the exception. It's billed as G0447 (individual, 15 minutes), and G0473 is the group version. It's a preventive benefit for beneficiaries with a BMI of 30 or more (NCD 210.12), and it works very differently from MNT:

• Only primary care can bill it. Coverage is limited to primary care physicians and practitioners (family, internal, geriatric and pediatric medicine, plus NPs, CNSs and PAs) in a primary care setting.
• An RD can deliver it only as auxiliary personnel. CMS's decision memo says Medicare may cover IBT "when billed by the primary care physician or practitioner and furnished by auxiliary personnel" under the incident-to conditions in 42 CFR 410.26(b) (CAG-00423N). In the same memo, CMS declined requests to let dietitians bill IBT directly.
• The incident-to conditions apply in full. The physician starts the course of treatment and stays actively involved. The RD works under direct supervision, and the claim goes out under the supervising practitioner's NPI.

Supervision rules changed recently. Starting January 1, 2026, CMS allows direct supervision through real-time audio-video (not audio-only) for services without a 010 or 090 global surgery indicator. That covers most incident-to services under §410.26 (CMS Telehealth FAQ, Q10). Before you build a workflow on it, confirm how your MAC applies it to G0447 and write down how the supervising practitioner was available.

Medicare Advantage and commercial payers

Incident-to is a traditional Medicare concept. Other payers set their own rules.

• Medicare Advantage plans must cover what Original Medicare covers, but their billing rules come from the plan's provider manual and your contract. Most expect the credentialed RD as the rendering provider. More on these plans in Medicare Advantage billing for dietitians.
• Commercial plans differ a lot. Some credential RDs and expect the RD's NPI on every claim. Others have "supervised provider" policies for staff who aren't credentialed. Many don't address RDs at all. The only safe answer is the one the payer puts in writing: the provider manual, a reimbursement policy, or a written reply from provider services.

If a payer tells you on the phone that billing under the physician is "fine," get a reference number and ask for the policy. The verification call script has the questions to ask.

The audit risk of getting this wrong

Billing an RD's MNT visit under a physician's NPI isn't a harmless formatting choice. It tells the payer that someone else delivered the service, at a different payment rate. When a post-payment review finds it, the usual result is recoupment: the payer takes back what it paid, often across every claim billed the same way. Some practices call this a clawback, and it can reach back years. Our insurance audits guide covers what triggers a review, and the audit-proof claims playbook covers how to answer one.

If you find it's been happening:

1. Stop billing that way now. Move the RD to her own enrollment and set up reassignment.
2. Find the affected claims. List dates of service, codes and amounts paid.
3. Get compliance or legal advice before you contact the payer. Medicare expects identified overpayments to be reported and returned within set deadlines, and a professional can tell you how to do that correctly.

Quick reference

The rule is short enough to fit on a sticky note: MNT uses your own NPI, and incident-to is for G0447 in primary care. For the payer-by-payer view of Medicare coverage, see Does Medicare cover nutrition counseling?

Part of Medicare MNT. Start with Medicare MNT Billing Guide for Dietitians (2026 Rules).