ICD-10-CM > M00-M99 > M20-M25 > M23 > M23.2 > M23.23 M23.23 Derangement of other medial meniscus due to old tear or injury Non-Billable/Non-Specific Codes M23.231Derangement of other medial meniscus due to old tear or injury, right kneeM23.232Derangement of other medial meniscus due to old tear or injury, left kneeM23.239Derangement of other medial meniscus due to old tear or injury, unspecified knee