M23 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Internal derangement of knee.
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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)
Cystic meniscus
Derangement of meniscus due to old tear or injury
Other meniscus derangements
Loose body in knee
Chronic instability of knee
Other spontaneous disruption of ligament(s) of knee
Other internal derangements of knee
Unspecified internal derangement of knee
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