Medicare Outpatient Observation Notice (MOON)
Enacted August 6, 2015, the Notice of Observation Treatment and Implication for Care Eligibility Act (NOTICE Act) requires hospitals and Critical Access Hospitals (CAH) to provide notification to individuals receiving observation services as outpatients for more than 24 hours explaining the status of the individual as an outpatient, not an inpatient, and the implications of such status.
Source:
https://www.cms.gov/newsroom/fact-sheets/medicare-outpatient-observation-notice-moon
The MOON must be delivered to beneficiaries in Original Medicare (fee-for-service) and Medicare Advantage enrollees who receive observation services as outpatients for more than 24 hours.
This also includes beneficiaries in the following circumstances:
•Beneficiaries who do not have Part B coverage (as noted on the MOON,
observation stays are covered under Medicare Part B).
Source:
https://www.cms.gov/Medicare/Medicare-General-Information/BNI/Downloads/CR9935-MOON-Instructions.pdf