My experience with status: Medicare criteria, i.e. Interqual, are listed by condition. Criteria for observation status vs. inpatient must be met for reimbursement for that stay. Also, certain surgeries are listed as to what Medicare reimburses for inpatient status vs. observation/outpatient. The observation status means less coverage, but only home medications that are administered during the Obs stay. If the patient has a Medicare replacement plan or supplemental insurance, that might cover the home po meds that are given during the stay. There seems to be a fear tactic within the general Medicare population that the ACA is causing hospitals to treat them unfairly. As CMs, we can assure them that observation is a way to reimburse less, but it also prevents fraud, and hospitals admitting patients with no need to be there. It in no way reduces the quality of care. Medicaid pays 24 hours of observation, private payers differ.