Medicare Outpatient Observation Notice MOON

Article Overview

This article explains the Medicare Outpatient Observation Notice (MOON) and why hospitals use it for patients receiving observation-level outpatient services rather than inpatient care. It covers the notice’s purpose, timing, the types of facilities and beneficiaries affected, and the broader payment and coverage context that makes the notice important for hospitals and patients. The content is most relevant to hospital compliance, patient communication, and revenue cycle staff who need a general understanding of the notice requirements and related Medicare coverage implications.