The Medicare SNF Three-Day Rule requires you to have at least three consecutive days as an admitted inpatient in a hospital before Medicare will cover skilled nursing facility care. This rule is crucial because it determines whether your SNF stay will be covered by Medicare Part A.
The key distinction is between inpatient admission and observation status. When you’re under observation, you’re technically an outpatient, and this time does not count toward the required three-day inpatient stay. Hospitals are required to inform you of your status, but it’s important to ask directly whether you’re admitted as an inpatient or under observation.
Here are two examples to illustrate the rule. If you were formally admitted to the hospital as an inpatient for three days and discharged on the fourth day, you would meet the three-day requirement for covered SNF care. However, if you spent one day in the emergency room under observation services and then were admitted as an inpatient for only two more days, your SNF stay would not be covered because the observation day doesn’t count toward the three-day requirement, leaving you with only two qualifying inpatient days.
