Final answer:
The CPT code for active wound care for wounds less than 20 square centimeters is 97597, which is specifically for selective debridement of a wound up to that size.
Step-by-step explanation:
The CPT code used for active wound care for wounds less than 20 square centimeters is 97597. CPT code 97597 refers to 'Debridement (e.g., high pressure waterjet with/without suction, sharp selective debridement with scissors, scalpel and forceps), open wound, (e.g., fibrin, devitalized epidermis and/or dermis, exudate, debris, biofilm), including topical application(s), wound assessment, and instruction(s) for ongoing care, per session; total wound(s) surface area less than or equal to 20 square centimeters'. It is used when a medical professional performs selective debridement of a wound that is less than or equal to the specified size. The procedure involves removing nonviable tissue to promote healing of the healthy tissue.