Burns and corrosions of external body surface, specified by site (T20-T25)

• burns and corrosions of first degree [erythema]
• burns and corrosions of second degree [blisters][epidermal loss]
• burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]

code from category T31 or T32 to identify extent of body surface involved