Insurance Billing

Billing Medicare for MNT: The Complete Dietitian's Guide

Medicare MNT billing for dietitians: covered conditions, the 3-hour/2-hour rule, referral requirements, G0270/G0271, telehealth, and claim specifics.

By Alva Health Team · Published July 12, 2026 · ← All articles

Medicare is the payer dietitians most often get wrong — not because it's arbitrary, but because it's specific. Commercial habits don't transfer: the covered conditions are enumerated, the hours are capped by statute, the referral isn't optional, and two G-codes exist that no commercial payer asks for. Bill Medicare on autopilot and the denials are automatic too.

The upside of all that specificity: once you know the rules, Medicare is one of the most predictable payers you'll ever bill. There's no mystery fee schedule and no coverage roulette. Here's the complete picture.

First prerequisite: you must be enrolled

You cannot bill Medicare — and legally cannot treat Medicare beneficiaries for covered MNT on a cash basis as a workaround — until you're enrolled as a Medicare provider. Enrollment (PECOS, MAC processing, effective dates) is its own process with its own timeline; work through the Medicare enrollment guide for dietitians first. Everything below assumes you're enrolled with an active PTAN.

What Medicare covers: three conditions, not "nutrition"

Medicare Part B covers MNT only for:

That's the list. Prediabetes, obesity without a qualifying diagnosis, hyperlipidemia, hypertension, GI conditions — none of these qualify for the Part B MNT benefit on their own.

What Medicare does NOT cover (the part that surprises people): general weight-loss counseling by a dietitian, billed as MNT, without a qualifying diagnosis. A patient who "just wants to lose weight" and has neither diabetes nor CKD is not an MNT beneficiary, no matter how medically reasonable the care is. (Medicare does have a separate obesity behavioral counseling benefit, but it's historically been payable to primary-care practitioners in primary-care settings rather than to RDs billing independently — if this is your niche, verify current CMS policy carefully before building a Medicare caseload around it.) When a service isn't covered, discuss cost with the patient up front and use an Advance Beneficiary Notice (ABN) so they can knowingly choose to pay out of pocket.

The hours: 3 in year one, 2 after

Coverage is measured in hours per calendar year, not visits:

• First calendar year of MNT: 3 hours.
• Each subsequent calendar year: 2 hours.

Notes that keep this from biting you:

• It's a calendar year, not a rolling 12 months. A patient who starts in November doesn't carry unused hours into January — the counter resets.
• Hours convert to units: 3 hours = 12 units of 15-minute codes. A typical first year might be a 4-unit initial (97802) plus four 2-unit follow-ups (97803). Count units with the 8-minute rule exactly as documented.
• Track the balance. If another dietitian already used hours this year, those hours are gone — you can't see the counter, so ask patients about prior MNT at intake.

The referral: always required, renewed annually

Medicare MNT must be ordered by the patient's treating physician — an MD or DO. Two rules trip practices constantly:

1. No referral, no coverage. Ever. There is no self-referred Medicare MNT. The referring physician's name and NPI go in boxes 17/17b of every CMS-1500 claim.
2. The referral must be renewed each calendar year. A patient in their third year of MNT needs a current-year order on file, not the original one. Build the renewal request into your December/January workflow — and into your physician referral relationships generally.

Keep the signed order in the chart. In an audit, the referral is the first document requested.

G0270 and G0271: additional hours after a change

When the patient's condition, diagnosis, or treatment regimen changes — new insulin regimen, progression of CKD stage, new complicating diagnosis — the physician can order additional hours beyond the annual cap. Those extra hours are billed with G-codes, not CPT codes:

Requirements: a new physician order for the additional hours and documentation of the change that justifies them. Bill G-codes for regular initial hours, or CPT codes for the additional ones, and you'll be denied for using the wrong family.

Telehealth: covered, but verify before you rely on it

MNT has been billable via telehealth under Medicare, with dietitians recognized as eligible telehealth providers for these services. But Medicare telehealth policy has been revised repeatedly in recent years — which services qualify, where the patient may be located, and which POS/modifier combinations apply have all shifted.

The safe operating procedure: before scheduling Medicare MNT as telehealth, check current CMS guidance (the CMS telehealth services list and your MAC's guidance) for MNT's status, then bill with the POS and modifier that guidance specifies. General telehealth mechanics are covered in the telehealth billing guide.

Billing specifics that differ from commercial payers

• Assignment is mandatory for MNT. You accept Medicare's allowed amount as payment in full. No balance billing the difference between your fee and the fee schedule. Medicare publishes MNT allowed amounts annually — look yours up by locality in the CMS Physician Fee Schedule tool (context in what drives dietitian reimbursement rates).
• Claim filing is mandatory, whether or not you'd rather hand the patient a superbill. If you furnish a covered service to a beneficiary, you file the claim — the superbill model is not an option for covered Medicare MNT.
• Diagnosis coding follows the referral. The qualifying condition (E10.x/ E11.x diabetes, N18.x CKD, or transplant status) drives the claim — this is not a Z71.3-primary situation.
• Part B cost sharing: MNT has generally been treated favorably on patient cost sharing compared to most Part B services; confirm current-year rules so you collect (or don't collect) correctly at the visit.
• Medicare Advantage is a different animal. MA plans must cover what Original Medicare covers, but networks, prior auth, and claim routing differ by plan — see billing Medicare Advantage as a dietitian.

A Medicare MNT checklist

1. Enrolled, with active PTAN and current fee schedule amounts.
2. Qualifying diagnosis confirmed (diabetes, non-dialysis CKD, or transplant within 36 months).
3. Current calendar-year physician referral on file, NPI captured.
4. Hours remaining this year verified against your records and patient history.
5. Units counted from documented face-to-face time.
6. Right code family: 97802/97803 for initial hours, G0270/G0271 for physician-ordered additional hours.
7. Telehealth status verified against current CMS guidance before virtual visits.
8. Claim filed with assignment accepted.

Rigid rules cut both ways: they're unforgiving to guesswork and generous to systems. Put these eight checks into a repeatable workflow and Medicare becomes your most boring payer — which is exactly what you want.

How Alva helps: Alva tracks the rules you'd otherwise track by hand — referral on file and renewal dates, hours used against the annual cap, units from actual session time — and validates each Medicare claim before submission, for $99/month. Start a 7-day free trial.