Burn and corrosion of head, face, and neck Excludes2burn and corrosion of ear drum (T28.41, T28.91)burn and corrosion of eye and adnexa (T26.-)burn and corrosion of mouth and pharynx (T28.0)The appropriate 7th character is to be added to each code from category T20A - initial encounterD - subsequent encounterS - sequela