Medicare Out Patient Observation Notice (MOON)

Article Overview

This article explains the Medicare Outpatient Observation Notice (MOON) and the circumstances that trigger its use for hospital patients who are not admitted as inpatients. It covers the notice’s purpose, patient communication requirements, implementation timing, and the broader payment and coverage context that makes the notice important for hospitals, beneficiaries, and care teams. The article is relevant to hospital compliance, patient access, coding, and revenue cycle staff who need to understand Medicare status notifications and related coverage implications.