Definition: APR DRGs

Developed by 3M, the All Patient Refined Diagnosis Related Groups (APR DRGs) classifies patients into four severity of illness (SOI) subclasses for each DRG: SOI 1- minor, SOI 2 – moderate, SOI 3 – major and SOI 4 – extreme. SOI is defined as the extent of physiological decompensation or organ system loss of function (i.e. the functional deterioration of a previously working structure or system). The SOI class furnishes a basis for evaluating hospital resource use or to establish patient care guidelines.