Hospital Inpatient Services Modernization Act This bill extends the Acute Hospital Care at Home Program under Medicare until two years after the end of the COVID-19 public health emergency (the program allows hospitals to treat certain patients from emergency departments or inpatient hospital beds at home during the emergency period). It also requires an evaluation of this program and the Hospital Without Walls program (the program allowed hospitals to transfer patients to outside facilities, such as hotels, to continue treatment during the emergency period).