How many stages of classification are there in the epuap npuap pressure ulcer classification system?

The EPUAP/NPUAP pressure ulcer classification system recognizes four stages of pressure injuries. These stages range from Stage I, indicating non-blanchable erythema of intact skin, to Stage IV, which involves full-thickness tissue loss and exposure of muscle, bone, or supporting structures. Additionally, there are categories for unstageable pressure injuries and deep tissue pressure injuries. Each stage helps in assessing the severity and appropriate management of pressure ulcers.