Current
M23 — Internal derangement of knee
Part of Chapter 13: Diseases of the musculoskeletal system and connective tissue , block Other joint disorders (M20-M25) .
Official Notes
Excludes1
ankylosis ( M24.66 )
Excludes1
deformity of knee ( M21 .-)
Excludes1
osteochondritis dissecans ( M93.2 )
Excludes2
current injury - see injury of knee and lower leg (S80-S89)
Excludes2
recurrent dislocation or subluxation of joints ( M24.4 )
Excludes2
recurrent dislocation or subluxation of patella (M22.0-M22.1)
Child Codes
- M23.0 Cystic meniscus Has subcodes
- M23.2 Derangement of meniscus due to old tear or injury Has subcodes
- M23.3 Other meniscus derangements Has subcodes
- M23.4 Loose body in knee Has subcodes
- M23.5 Chronic instability of knee Has subcodes
- M23.6 Other spontaneous disruption of ligament(s) of knee Has subcodes
- M23.8 Other internal derangements of knee Has subcodes
- M23.9 Unspecified internal derangement of knee Has subcodes
Referenced By
Official notes on these codes cite M23.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS