National Coverage Determination (NCD)
A National Coverage Determination (NCD) is CMS's nationwide rule on whether, and under what conditions, Medicare covers a specific service.
Updated
A National Coverage Determination (NCD) is a CMS-issued, nationwide policy that establishes whether Medicare covers a particular item or service, and any conditions — such as diagnosis, frequency, or setting — that must be met for coverage to apply. An NCD applies uniformly across all Medicare regions.
Where no NCD exists, a Medicare Administrative Contractor may issue a Local Coverage Determination (LCD) for its own jurisdiction. When an NCD exists it supersedes any conflicting LCD for the same service.
In practice
An NCD can make coverage conditional on documented clinical criteria, and a claim that does not meet those conditions will be denied — sometimes with limited appeal grounds, because the denial follows a national policy rather than a case-level judgment. Reading the relevant NCD before billing a service with conditional coverage is how a practice avoids predictable denials.
Commonly confused with
- Local Coverage Determination: An LCD is a MAC's coverage policy for its own region when no NCD exists; an NCD is nationwide and takes precedence where the two address the same service.