ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.7 T21.7 Corrosion of third degree of trunk Non-Billable/Non-Specific Code First (T51-T65) to identify chemical and intent Use Additional external cause code to identify place (Y92) Codes T21.70Corrosion of third degree of trunk, unspecified siteT21.70XA..., initial encounterT21.70XD..., subsequent encounterT21.70XS..., sequelaT21.71Corrosion of third degree of chest wallT21.71XA..., initial encounterT21.71XD..., subsequent encounterT21.71XS..., sequelaT21.72Corrosion of third degree of abdominal wallT21.72XA..., initial encounterT21.72XD..., subsequent encounterT21.72XS..., sequelaT21.73Corrosion of third degree of upper backT21.73XA..., initial encounterT21.73XD..., subsequent encounterT21.73XS..., sequelaT21.74Corrosion of third degree of lower backT21.74XA..., initial encounterT21.74XD..., subsequent encounterT21.74XS..., sequelaT21.75Corrosion of third degree of buttockT21.75XA..., initial encounterT21.75XD..., subsequent encounterT21.75XS..., sequelaT21.76Corrosion of third degree of male genital regionT21.76XA..., initial encounterT21.76XD..., subsequent encounterT21.76XS..., sequelaT21.77Corrosion of third degree of female genital regionT21.77XA..., initial encounterT21.77XD..., subsequent encounterT21.77XS..., sequelaT21.79Corrosion of third degree of other site of trunkT21.79XA..., initial encounterT21.79XD..., subsequent encounterT21.79XS..., sequela