ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.5 > T24.52 > T24.529 T24.529 Corrosion of first degree of unspecified knee Non-Billable/Non-Specific Codes T24.529A..., initial encounterT24.529D..., subsequent encounterT24.529S..., sequela