Medical institutions that provide diagnostic and treatment services for people whose illnesses or injuries require that they occupy a bed for at least one night. Hospitals can be distinguished by the level of care they offer (general acute, subacute, extended acute care), the auspices under which they operate which also, in some cases, defines the patients they serve (city/county, state, Veteran's Affairs, military hospitals), and the medical conditions they specialize in treating (specialty hospitals).