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.
Type 1 excludes
Type 2 excludes
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)
Codes
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
Versions
2026
No changes
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
Code changed
Type 1 excludes
ankylosis (M24.66)current injury - see injury of knee and lower leg (S80-S89)deformity of knee (M21.-)osteochondritis dissecans (M93.2)recurrent dislocation or subluxation of joints (M24.4)recurrent dislocation or subluxation of patella (M22.0-M22.1)
- ankylosis (M24.66)
- deformity of knee (M21.-)
- osteochondritis dissecans (M93.2)
Type 2 excludes
- 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)
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code