Internal derangement of knee - M23

Excludes1: It indicates that the conditions described by two codes cannot occur together in the same patient. These codes are mutually exclusive.

Type 1 Excludes:

ankylosis (M24.66)
deformity of knee (M21.-)
osteochondritis dissecans (M93.2)

Excludes2: This note means that the conditions described by two codes are not usually associated with each other but can sometimes occur together.

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)

These ranges represents subcategories of Internal derangement of knee. The "M23" signifies that these are the diseases within this broad category.

Codes:

M23.0 - Cystic meniscus
M23.00 - Cystic meniscus, unspecified meniscus
M23.000 - Cystic meniscus, unspecified lateral meniscus, right knee
M23.001 - Cystic meniscus, unspecified lateral meniscus, left knee
M23.002 - Cystic meniscus, unspecified lateral meniscus, unspecified knee
M23.003 - Cystic meniscus, unspecified medial meniscus, right knee
M23.004 - Cystic meniscus, unspecified medial meniscus, left knee
M23.005 - Cystic meniscus, unspecified medial meniscus, unspecified knee
M23.006 - Cystic meniscus, unspecified meniscus, right knee
M23.007 - Cystic meniscus, unspecified meniscus, left knee
M23.009 - Cystic meniscus, unspecified meniscus, unspecified knee
M23.01 - Cystic meniscus, anterior horn of medial meniscus
M23.011 - Cystic meniscus, anterior horn of medial meniscus, right knee
M23.012 - Cystic meniscus, anterior horn of medial meniscus, left knee
M23.019 - Cystic meniscus, anterior horn of medial meniscus, unspecified knee
M23.02 - Cystic meniscus, posterior horn of medial meniscus
M23.021 - Cystic meniscus, posterior horn of medial meniscus, right knee
M23.022 - Cystic meniscus, posterior horn of medial meniscus, left knee
M23.029 - Cystic meniscus, posterior horn of medial meniscus, unspecified knee
M23.03 - Cystic meniscus, other medial meniscus
M23.031 - Cystic meniscus, other medial meniscus, right knee
M23.032 - Cystic meniscus, other medial meniscus, left knee
M23.039 - Cystic meniscus, other medial meniscus, unspecified knee
M23.04 - Cystic meniscus, anterior horn of lateral meniscus
M23.041 - Cystic meniscus, anterior horn of lateral meniscus, right knee
M23.042 - Cystic meniscus, anterior horn of lateral meniscus, left knee
M23.049 - Cystic meniscus, anterior horn of lateral meniscus, unspecified knee
M23.05 - Cystic meniscus, posterior horn of lateral meniscus
M23.051 - Cystic meniscus, posterior horn of lateral meniscus, right knee
M23.052 - Cystic meniscus, posterior horn of lateral meniscus, left knee
M23.059 - Cystic meniscus, posterior horn of lateral meniscus, unspecified knee
M23.06 - Cystic meniscus, other lateral meniscus
M23.061 - Cystic meniscus, other lateral meniscus, right knee
M23.062 - Cystic meniscus, other lateral meniscus, left knee
M23.069 - Cystic meniscus, other lateral meniscus, unspecified knee
M23.2 - Derangement of meniscus due to old tear or injury
M23.20 - Derangement of unspecified meniscus due to old tear or injury
M23.200 - Derangement of unspecified lateral meniscus due to old tear or injury, right knee
M23.201 - Derangement of unspecified lateral meniscus due to old tear or injury, left knee
M23.202 - Derangement of unspecified lateral meniscus due to old tear or injury, unspecified knee
M23.203 - Derangement of unspecified medial meniscus due to old tear or injury, right knee
M23.204 - Derangement of unspecified medial meniscus due to old tear or injury, left knee
M23.205 - Derangement of unspecified medial meniscus due to old tear or injury, unspecified knee
M23.206 - Derangement of unspecified meniscus due to old tear or injury, right knee
M23.207 - Derangement of unspecified meniscus due to old tear or injury, left knee
M23.209 - Derangement of unspecified meniscus due to old tear or injury, unspecified knee
M23.21 - Derangement of anterior horn of medial meniscus due to old tear or injury
M23.211 - Derangement of anterior horn of medial meniscus due to old tear or injury, right knee
M23.212 - Derangement of anterior horn of medial meniscus due to old tear or injury, left knee
M23.219 - Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified knee
M23.22 - Derangement of posterior horn of medial meniscus due to old tear or injury
M23.221 - Derangement of posterior horn of medial meniscus due to old tear or injury, right knee
M23.222 - Derangement of posterior horn of medial meniscus due to old tear or injury, left knee
M23.229 - Derangement of posterior horn of medial meniscus due to old tear or injury, unspecified knee
M23.23 - Derangement of other medial meniscus due to old tear or injury
M23.231 - Derangement of other medial meniscus due to old tear or injury, right knee
M23.232 - Derangement of other medial meniscus due to old tear or injury, left knee
M23.239 - Derangement of other medial meniscus due to old tear or injury, unspecified knee
M23.24 - Derangement of anterior horn of lateral meniscus due to old tear or injury
M23.241 - Derangement of anterior horn of lateral meniscus due to old tear or injury, right knee
M23.242 - Derangement of anterior horn of lateral meniscus due to old tear or injury, left knee
M23.249 - Derangement of anterior horn of lateral meniscus due to old tear or injury, unspecified knee
M23.25 - Derangement of posterior horn of lateral meniscus due to old tear or injury
M23.251 - Derangement of posterior horn of lateral meniscus due to old tear or injury, right knee
M23.252 - Derangement of posterior horn of lateral meniscus due to old tear or injury, left knee
M23.259 - Derangement of posterior horn of lateral meniscus due to old tear or injury, unspecified knee
M23.26 - Derangement of other lateral meniscus due to old tear or injury
M23.261 - Derangement of other lateral meniscus due to old tear or injury, right knee
M23.262 - Derangement of other lateral meniscus due to old tear or injury, left knee
M23.269 - Derangement of other lateral meniscus due to old tear or injury, unspecified knee
M23.3 - Other meniscus derangements
M23.30 - Other meniscus derangements, unspecified meniscus
M23.300 - Other meniscus derangements, unspecified lateral meniscus, right knee
M23.301 - Other meniscus derangements, unspecified lateral meniscus, left knee
M23.302 - Other meniscus derangements, unspecified lateral meniscus, unspecified knee
M23.303 - Other meniscus derangements, unspecified medial meniscus, right knee
M23.304 - Other meniscus derangements, unspecified medial meniscus, left knee
M23.305 - Other meniscus derangements, unspecified medial meniscus, unspecified knee
M23.306 - Other meniscus derangements, unspecified meniscus, right knee
M23.307 - Other meniscus derangements, unspecified meniscus, left knee
M23.309 - Other meniscus derangements, unspecified meniscus, unspecified knee
M23.31 - Other meniscus derangements, anterior horn of medial meniscus
M23.311 - Other meniscus derangements, anterior horn of medial meniscus, right knee
M23.312 - Other meniscus derangements, anterior horn of medial meniscus, left knee
M23.319 - Other meniscus derangements, anterior horn of medial meniscus, unspecified knee
M23.32 - Other meniscus derangements, posterior horn of medial meniscus
M23.321 - Other meniscus derangements, posterior horn of medial meniscus, right knee
M23.322 - Other meniscus derangements, posterior horn of medial meniscus, left knee
M23.329 - Other meniscus derangements, posterior horn of medial meniscus, unspecified knee
M23.33 - Other meniscus derangements, other medial meniscus
M23.331 - Other meniscus derangements, other medial meniscus, right knee
M23.332 - Other meniscus derangements, other medial meniscus, left knee
M23.339 - Other meniscus derangements, other medial meniscus, unspecified knee
M23.34 - Other meniscus derangements, anterior horn of lateral meniscus
M23.341 - Other meniscus derangements, anterior horn of lateral meniscus, right knee
M23.342 - Other meniscus derangements, anterior horn of lateral meniscus, left knee
M23.349 - Other meniscus derangements, anterior horn of lateral meniscus, unspecified knee
M23.35 - Other meniscus derangements, posterior horn of lateral meniscus
M23.351 - Other meniscus derangements, posterior horn of lateral meniscus, right knee
M23.352 - Other meniscus derangements, posterior horn of lateral meniscus, left knee
M23.359 - Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee
M23.36 - Other meniscus derangements, other lateral meniscus
M23.361 - Other meniscus derangements, other lateral meniscus, right knee
M23.362 - Other meniscus derangements, other lateral meniscus, left knee
M23.369 - Other meniscus derangements, other lateral meniscus, unspecified knee
M23.4 - Loose body in knee
M23.40 - Loose body in knee, unspecified knee
M23.41 - Loose body in knee, right knee
M23.42 - Loose body in knee, left knee
M23.5 - Chronic instability of knee
M23.50 - Chronic instability of knee, unspecified knee
M23.51 - Chronic instability of knee, right knee
M23.52 - Chronic instability of knee, left knee
M23.6 - Other spontaneous disruption of ligament(s) of knee
M23.60 - Other spontaneous disruption of unspecified ligament of knee
M23.601 - Other spontaneous disruption of unspecified ligament of right knee
M23.602 - Other spontaneous disruption of unspecified ligament of left knee
M23.609 - Other spontaneous disruption of unspecified ligament of unspecified knee
M23.61 - Other spontaneous disruption of anterior cruciate ligament of knee
M23.611 - Other spontaneous disruption of anterior cruciate ligament of right knee
M23.612 - Other spontaneous disruption of anterior cruciate ligament of left knee
M23.619 - Other spontaneous disruption of anterior cruciate ligament of unspecified knee
M23.62 - Other spontaneous disruption of posterior cruciate ligament of knee
M23.621 - Other spontaneous disruption of posterior cruciate ligament of right knee
M23.622 - Other spontaneous disruption of posterior cruciate ligament of left knee
M23.629 - Other spontaneous disruption of posterior cruciate ligament of unspecified knee
M23.63 - Other spontaneous disruption of medial collateral ligament of knee
M23.631 - Other spontaneous disruption of medial collateral ligament of right knee
M23.632 - Other spontaneous disruption of medial collateral ligament of left knee
M23.639 - Other spontaneous disruption of medial collateral ligament of unspecified knee
M23.64 - Other spontaneous disruption of lateral collateral ligament of knee
M23.641 - Other spontaneous disruption of lateral collateral ligament of right knee
M23.642 - Other spontaneous disruption of lateral collateral ligament of left knee
M23.649 - Other spontaneous disruption of lateral collateral ligament of unspecified knee
M23.67 - Other spontaneous disruption of capsular ligament of knee
M23.671 - Other spontaneous disruption of capsular ligament of right knee
M23.672 - Other spontaneous disruption of capsular ligament of left knee
M23.679 - Other spontaneous disruption of capsular ligament of unspecified knee
M23.8 - Other internal derangements of knee
M23.8X - Other internal derangements of knee
M23.8X1 - Other internal derangements of right knee
M23.8X2 - Other internal derangements of left knee
M23.8X9 - Other internal derangements of unspecified knee
M23.9 - Unspecified internal derangement of knee
M23.90 - Unspecified internal derangement of unspecified knee
M23.91 - Unspecified internal derangement of right knee
M23.92 - Unspecified internal derangement of left knee