When a Medicare beneficiary receives outpatient observation services from a hospital or critical access hospital (CAH) for more than 24 hours, he or she (or the beneficiary’s authorized representative) must receive a Medicare Outpatient Observation Notice (MOON). The written MOON and a verbal explanation of the notice must be delivered no later than 36 hours after services were initiated. The MOON is mandated by the Federal Notice of Observation Treatment and Implication for Care Eligibility Act (NOTICE Act), passed on Aug. 6, 2015.
Hospitals and CAHs must use one of the following Office of Management and Budget (OMB)-approved MOONs, which can be downloaded on the CMS website:
Instructions on how to fill out the MOON can be found here. Additional information about the MOON can be found in CMS MLN Matters Number 9935 at https://www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNMattersArticles/Downloads/MM9935.pdf