According to Medicare.gov, a patient must have Medicare Part A to receive coverage in a skilled nursing facility. The patient must also have a qualifying medical condition and a three-day inpatient stay in the hospital. Medicare covers the first 20 days at 100 percent for the benefit period.
Medicare.gov explains, starting on day 21 through day 100, the patient is responsible for a coinsurance of $152.00 per day; this applies for each benefit period. On day 101, the patient becomes responsible for all medical expenses while in the skilled nursing facility.
If the patient is required to leave the skilled nursing facility, this is considered a "break in coverage." Medicare.gov notes that this may impact coverage depending on the length of the break.