ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.7 > T24.72 T24.72 Corrosion of third degree of knee Non-Billable/Non-Specific Codes T24.721Corrosion of third degree of right kneeT24.721A..., initial encounterT24.721D..., subsequent encounterT24.721S..., sequelaT24.722Corrosion of third degree of left kneeT24.722A..., initial encounterT24.722D..., subsequent encounterT24.722S..., sequelaT24.729Corrosion of third degree of unspecified kneeT24.729A..., initial encounterT24.729D..., subsequent encounterT24.729S..., sequela