ICD-10-CM > S00-T88 > T20-T25 > T24 > T24.6 > T24.62 > T24.629 T24.629 Corrosion of second degree of unspecified knee Non-Billable/Non-Specific Codes T24.629A..., initial encounterT24.629D..., subsequent encounterT24.629S..., sequela