ICD-10-CM > M00-M99 > M91-M94 > M94 > M94.2 > M94.26 M94.26 Chondromalacia, knee Non-Billable/Non-Specific Codes M94.261Chondromalacia, right kneeM94.262Chondromalacia, left kneeM94.269Chondromalacia, unspecified knee