M23.20Derangement of unspecified meniscus due to old tear or injury

M23.20 is the ICD-10-CM diagnosis code for derangement of unspecified meniscus due to old tear or injury. It belongs to category M23 (internal derangement of knee), block M20-M25 (other joint disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

Within M23.2, choose M23.20 (unspecified meniscus due to old tear or injury) only when documentation doesn't support a more specific option: anterior horn of medial meniscus due to old tear or injury (M23.21), posterior horn of medial meniscus due to old tear or injury (M23.22), other medial meniscus due to old tear or injury (M23.23), anterior horn of lateral meniscus due to old tear or injury (M23.24), posterior horn of lateral meniscus due to old tear or injury (M23.25) and other lateral meniscus due to old tear or injury (M23.26).

To report this condition, pick the subcode that matches the documentation: M23.200 (knee), M23.201 (knee), M23.202 (knee), M23.203 (knee), M23.204 (knee), M23.205 (knee), M23.206 (right knee), M23.207 (left knee) and 1 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.