The 60% rule is a federal regulatory compliance standard established by the Centers for Medicare & Medicaid Services for inpatient rehabilitation facilities in the United States. Under this mandate, at least 60 percent of a facility's total patient population must consist of individuals diagnosed with one of specific medical conditions that require intensive, multidisciplinary rehabilitative care, such as strokes, spinal cord injuries, brain trauma, or major multiple amputations. This rule ensures that designated rehabilitation hospitals maintain their specialized focus on complex medical recovery rather than general custodial care.