Hospital providers must provide written and verbal notice to Medicare Advantage members when they are receiving observation services as outpatients for more than 24 hours.
This notice is called the Medicare Outpatient Observation Notice (MOON). It informs Medicare beneficiaries (including Medicare Advantage plan members) that they are receiving outpatient observation services and are not admitted as inpatient of a hospital or critical access hospital (CAH).
All hospitals and CAHs have been required to provide this notice since March 2017. For more information, visit the Centers for Medicare & Medicaid Services (CMS) website.