CMS Medical Nutrition Therapy Coverage Policy Update (NCD 252): What Billing Teams Need to Know for 2026

CMS's National Coverage Determination 252 governing Medical Nutrition Therapy (MNT) has been modified, with an updated effective date of March 12, 2026. This policy establishes coverage duration limits, frequency rules, and coordination requirements between MNT and Diabetes Self-Management Training (DSMT) for Medicare Part B beneficiaries. If your practice or facility bills MNT services for patients with diabetes or renal disease, this policy directly affects how you document medical necessity and schedule services.

What CMS NCD 252 Covers for Medical Nutrition Therapy

Under Section 1861(s)(2)(V) of the Social Security Act, Medicare Part B covers MNT services for beneficiaries diagnosed with diabetes or renal disease as defined at 42 CFR 410.130. The regulations governing MNT were first established January 2, 2002, and this NCD—last substantively reviewed in December 2021—coordinates coverage rules at the national level.

The core benefit is straightforward: Medicare covers a defined number of hours of MNT per benefit period, and those hours are tied to how long the beneficiary has been receiving MNT. The key distinctions are first-year versus subsequent-year limits, and whether additional hours can be justified by a change in the patient's condition.

CMS MNT Hour Limits: First Year vs. Subsequent Years

Effective January 1, 2022, and carried forward under this updated NCD, the nationally covered hour limits are:

• First year of MNT: Three hours of MNT administration
• Subsequent years: Two hours per benefit period

These limits apply to both diabetes and renal disease diagnoses. The treating dietitian or nutritionist retains clinical discretion over how those hours are distributed across individual sessions—meaning all three (or two) hours don't need to be delivered in a single visit. The only requirement is that all other conditions under the NCD and 42 CFR 410.130–410.134 are met.

This flexibility matters for scheduling. A first-year patient could receive, for example, one 60-minute session followed by two 30-minute follow-ups, as long as the total doesn't exceed the covered limit.

When Additional MNT Hours Are Medically Necessary Under CMS Policy

The policy carves out a clear exception for patients whose clinical situation changes during an episode of care. Pursuant to 42 CFR 410.132(b)(5), additional MNT hours beyond the standard limits are considered medically necessary and covered when:

All three elements must be present. The physician's determination—and the order for additional hours—needs to be clearly documented in the medical record. A dietitian's clinical note alone is not sufficient to establish medical necessity for hours beyond the standard benefit. Billing teams should establish a workflow that captures and retains the physician's written or electronic order before additional MNT claims are submitted.

CMS Coverage Rules for MNT and DSMT in the Same Episode of Care

One of the most operationally significant aspects of NCD 252 is how it handles patients receiving both MNT and Diabetes Self-Management Training (DSMT). These are two distinct benefits that can overlap for diabetic patients, and prior policy versions created ambiguity about whether one reduced the other.

Under the current and modified NCD, if a physician determines that both MNT and DSMT are medically necessary in the same episode of care, Medicare will cover both at their full benefit levels—no reduction to either. The physician's medical necessity determination for concurrent services must be documented.

There is one firm rule: MNT and DSMT cannot be provided on the same date of service. Sessions must be scheduled on separate days. Billing for both on a single date of service will result in a claim denial and could trigger a medical review flag. Schedulers and billing staff need to coordinate closely to prevent same-day service conflicts from creating downstream revenue cycle problems.

Affected Codes

This policy does not list specific CPT or HCPCS codes in the policy document. Billing teams should cross-reference the applicable MNT and DSMT procedure codes through the CMS Claims Processing Instructions referenced in this NCD (Transmittal 11272 and Transmittal 11426) and confirm current coding with their Medicare Administrative Contractor (MAC).

Related ICD-10 Diagnosis Codes

This policy does not enumerate specific ICD-10-CM codes. Coverage applies to beneficiaries with a diagnosis of diabetes or renal disease as defined at 42 CFR 410.130. Confirm applicable diagnosis codes with your MAC or coding resources.

Prior Authorization and Documentation Requirements

NCD 252 does not establish a prior authorization requirement for standard MNT hours. However, the policy does place the burden of establishing medical necessity on clear physician documentation—particularly for:

• Concurrent MNT and DSMT services (physician must determine both are medically necessary)
• Additional hours beyond the standard benefit (physician must document the change in condition and issue an order)

Practices should treat these physician documentation requirements as effectively equivalent to prior auth checkpoints in terms of claims risk. A missing or inadequate physician order is the single most likely reason an MNT claim will be denied or recouped under this policy.

What Your Billing Team Should Do