M23Internal derangement of knee
ICD-10-CM category (non-billable header) code — part of Other joint disorders (M20-M25)
Coding Notes
Excludes1 (never code both together)
- ankylosis (M24.66)
- deformity of knee (M21.-)
- osteochondritis dissecans (M93.2)
Excludes2 (not part of this condition — may code both)
- current injury - see injury of knee and lower leg (S80-S89)
- recurrent dislocation or subluxation of joints (M24.4)
- recurrent dislocation or subluxation of patella (M22.0-M22.1)
Subcategories (8)
- M23.0 Cystic meniscus
- M23.2 Derangement of meniscus due to old tear or injury
- M23.3 Other meniscus derangements
- M23.4 Loose body in knee
- M23.5 Chronic instability of knee
- M23.6 Other spontaneous disruption of ligament(s) of knee
- M23.8 Other internal derangements of knee
- M23.9 Unspecified internal derangement of knee