ICD-10-CM category
M23: Internal derangement of knee
Codes under M23 (Internal derangement of knee). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M23.0 | Cystic meniscus | — |
| M23.0 | Cystic meniscus | — |
| M23.00 | Cystic meniscus, unspecified meniscus | — |
| M23.00 | Cystic meniscus, unspecified meniscus | — |
| M23.000 | Cystic meniscus, unspecified lateral meniscus, right knee | ✓ |
| M23.000 | Cystic meniscus, unspecified lateral meniscus, right knee | ✓ |
| M23.001 | Cystic meniscus, unspecified lateral meniscus, left knee | ✓ |
| M23.001 | Cystic meniscus, unspecified lateral meniscus, left knee | ✓ |
| M23.01 | Cystic meniscus, anterior horn of medial meniscus | — |
| M23.01 | Cystic meniscus, anterior horn of medial meniscus | — |
| M23.002 | Cystic meniscus, unspecified lateral meniscus, unspecified knee | ✓ |
| M23.002 | Cystic meniscus, unspecified lateral meniscus, unspecified knee | ✓ |
| M23.02 | Cystic meniscus, posterior horn of medial meniscus | — |
| M23.02 | Cystic meniscus, posterior horn of medial meniscus | — |
| M23.2 | Derangement of meniscus due to old tear or injury | — |
| M23.2 | Derangement of meniscus due to old tear or injury | — |
| M23.003 | Cystic meniscus, unspecified medial meniscus, right knee | ✓ |
| M23.003 | Cystic meniscus, unspecified medial meniscus, right knee | ✓ |
| M23.03 | Cystic meniscus, other medial meniscus | — |
| M23.03 | Cystic meniscus, other medial meniscus | — |
| M23.3 | Other meniscus derangements | — |
| M23.3 | Other meniscus derangements | — |
| M23.004 | Cystic meniscus, unspecified medial meniscus, left knee | ✓ |
| M23.004 | Cystic meniscus, unspecified medial meniscus, left knee | ✓ |
| M23.04 | Cystic meniscus, anterior horn of lateral meniscus | — |
| M23.04 | Cystic meniscus, anterior horn of lateral meniscus | — |
| M23.4 | Loose body in knee | — |
| M23.4 | Loose body in knee | — |
| M23.005 | Cystic meniscus, unspecified medial meniscus, unspecified knee | ✓ |
| M23.005 | Cystic meniscus, unspecified medial meniscus, unspecified knee | ✓ |
| M23.05 | Cystic meniscus, posterior horn of lateral meniscus | — |
| M23.05 | Cystic meniscus, posterior horn of lateral meniscus | — |
| M23.5 | Chronic instability of knee | — |
| M23.5 | Chronic instability of knee | — |
| M23.006 | Cystic meniscus, unspecified meniscus, right knee | ✓ |
| M23.006 | Cystic meniscus, unspecified meniscus, right knee | ✓ |
| M23.06 | Cystic meniscus, other lateral meniscus | — |
| M23.06 | Cystic meniscus, other lateral meniscus | — |
| M23.6 | Other spontaneous disruption of ligament(s) of knee | — |
| M23.6 | Other spontaneous disruption of ligament(s) of knee | — |
| M23.007 | Cystic meniscus, unspecified meniscus, left knee | ✓ |
| M23.007 | Cystic meniscus, unspecified meniscus, left knee | ✓ |
| M23.8 | Other internal derangements of knee | — |
| M23.8 | Other internal derangements of knee | — |
| M23.8X | Other internal derangements of knee | — |
| M23.8X | Other internal derangements of knee | — |
| M23.8X1 | Other internal derangements of right knee | ✓ |
| M23.8X1 | Other internal derangements of right knee | ✓ |
| M23.8X2 | Other internal derangements of left knee | ✓ |
| M23.8X2 | Other internal derangements of left knee | ✓ |
| M23.8X9 | Other internal derangements of unspecified knee | ✓ |
| M23.8X9 | Other internal derangements of unspecified knee | ✓ |
| M23.009 | Cystic meniscus, unspecified meniscus, unspecified knee | ✓ |
| M23.009 | Cystic meniscus, unspecified meniscus, unspecified knee | ✓ |
| M23.9 | Unspecified internal derangement of knee | — |
| M23.9 | Unspecified internal derangement of knee | — |
| M23.011 | Cystic meniscus, anterior horn of medial meniscus, right knee | ✓ |
| M23.011 | Cystic meniscus, anterior horn of medial meniscus, right knee | ✓ |
| M23.012 | Cystic meniscus, anterior horn of medial meniscus, left knee | ✓ |
| M23.012 | Cystic meniscus, anterior horn of medial meniscus, left knee | ✓ |
| M23.019 | Cystic meniscus, anterior horn of medial meniscus, unspecified knee | ✓ |
| M23.019 | Cystic meniscus, anterior horn of medial meniscus, unspecified knee | ✓ |
| M23.20 | Derangement of unspecified meniscus due to old tear or injury | — |
| M23.20 | Derangement of unspecified meniscus due to old tear or injury | — |
| M23.021 | Cystic meniscus, posterior horn of medial meniscus, right knee | ✓ |
| M23.021 | Cystic meniscus, posterior horn of medial meniscus, right knee | ✓ |
| M23.21 | Derangement of anterior horn of medial meniscus due to old tear or injury | — |
| M23.21 | Derangement of anterior horn of medial meniscus due to old tear or injury | — |
| M23.022 | Cystic meniscus, posterior horn of medial meniscus, left knee | ✓ |
| M23.022 | Cystic meniscus, posterior horn of medial meniscus, left knee | ✓ |
| M23.22 | Derangement of posterior horn of medial meniscus due to old tear or injury | — |
| M23.22 | Derangement of posterior horn of medial meniscus due to old tear or injury | — |
| M23.23 | Derangement of other medial meniscus due to old tear or injury | — |
| M23.23 | Derangement of other medial meniscus due to old tear or injury | — |
| M23.24 | Derangement of anterior horn of lateral meniscus due to old tear or injury | — |
| M23.24 | Derangement of anterior horn of lateral meniscus due to old tear or injury | — |
| M23.25 | Derangement of posterior horn of lateral meniscus due to old tear or injury | — |
| M23.25 | Derangement of posterior horn of lateral meniscus due to old tear or injury | — |
| M23.26 | Derangement of other lateral meniscus due to old tear or injury | — |
| M23.26 | Derangement of other lateral meniscus due to old tear or injury | — |
| M23.029 | Cystic meniscus, posterior horn of medial meniscus, unspecified knee | ✓ |
| M23.029 | Cystic meniscus, posterior horn of medial meniscus, unspecified knee | ✓ |
| M23.30 | Other meniscus derangements, unspecified meniscus | — |
| M23.30 | Other meniscus derangements, unspecified meniscus | — |
| M23.031 | Cystic meniscus, other medial meniscus, right knee | ✓ |
| M23.031 | Cystic meniscus, other medial meniscus, right knee | ✓ |
| M23.31 | Other meniscus derangements, anterior horn of medial meniscus | — |
| M23.31 | Other meniscus derangements, anterior horn of medial meniscus | — |
| M23.032 | Cystic meniscus, other medial meniscus, left knee | ✓ |
| M23.032 | Cystic meniscus, other medial meniscus, left knee | ✓ |
| M23.32 | Other meniscus derangements, posterior horn of medial meniscus | — |
| M23.32 | Other meniscus derangements, posterior horn of medial meniscus | — |
| M23.33 | Other meniscus derangements, other medial meniscus | — |
| M23.33 | Other meniscus derangements, other medial meniscus | — |
| M23.34 | Other meniscus derangements, anterior horn of lateral meniscus | — |
| M23.34 | Other meniscus derangements, anterior horn of lateral meniscus | — |
| M23.35 | Other meniscus derangements, posterior horn of lateral meniscus | — |
| M23.35 | Other meniscus derangements, posterior horn of lateral meniscus | — |
| M23.36 | Other meniscus derangements, other lateral meniscus | — |
| M23.36 | Other meniscus derangements, other lateral meniscus | — |
| M23.039 | Cystic meniscus, other medial meniscus, unspecified knee | ✓ |
| M23.039 | Cystic meniscus, other medial meniscus, unspecified knee | ✓ |
| M23.40 | Loose body in knee, unspecified knee | ✓ |
| M23.40 | Loose body in knee, unspecified knee | ✓ |
| M23.041 | Cystic meniscus, anterior horn of lateral meniscus, right knee | ✓ |
| M23.041 | Cystic meniscus, anterior horn of lateral meniscus, right knee | ✓ |
| M23.41 | Loose body in knee, right knee | ✓ |
| M23.41 | Loose body in knee, right knee | ✓ |
| M23.042 | Cystic meniscus, anterior horn of lateral meniscus, left knee | ✓ |
| M23.042 | Cystic meniscus, anterior horn of lateral meniscus, left knee | ✓ |
| M23.42 | Loose body in knee, left knee | ✓ |
| M23.42 | Loose body in knee, left knee | ✓ |
| M23.049 | Cystic meniscus, anterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.049 | Cystic meniscus, anterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.50 | Chronic instability of knee, unspecified knee | ✓ |
| M23.50 | Chronic instability of knee, unspecified knee | ✓ |
| M23.051 | Cystic meniscus, posterior horn of lateral meniscus, right knee | ✓ |
| M23.051 | Cystic meniscus, posterior horn of lateral meniscus, right knee | ✓ |
| M23.51 | Chronic instability of knee, right knee | ✓ |
| M23.51 | Chronic instability of knee, right knee | ✓ |
| M23.052 | Cystic meniscus, posterior horn of lateral meniscus, left knee | ✓ |
| M23.052 | Cystic meniscus, posterior horn of lateral meniscus, left knee | ✓ |
| M23.52 | Chronic instability of knee, left knee | ✓ |
| M23.52 | Chronic instability of knee, left knee | ✓ |
| M23.059 | Cystic meniscus, posterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.059 | Cystic meniscus, posterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.60 | Other spontaneous disruption of unspecified ligament of knee | — |
| M23.60 | Other spontaneous disruption of unspecified ligament of knee | — |
| M23.061 | Cystic meniscus, other lateral meniscus, right knee | ✓ |
| M23.061 | Cystic meniscus, other lateral meniscus, right knee | ✓ |
| M23.61 | Other spontaneous disruption of anterior cruciate ligament of knee | — |
| M23.61 | Other spontaneous disruption of anterior cruciate ligament of knee | — |
| M23.062 | Cystic meniscus, other lateral meniscus, left knee | ✓ |
| M23.062 | Cystic meniscus, other lateral meniscus, left knee | ✓ |
| M23.62 | Other spontaneous disruption of posterior cruciate ligament of knee | — |
| M23.62 | Other spontaneous disruption of posterior cruciate ligament of knee | — |
| M23.63 | Other spontaneous disruption of medial collateral ligament of knee | — |
| M23.63 | Other spontaneous disruption of medial collateral ligament of knee | — |
| M23.64 | Other spontaneous disruption of lateral collateral ligament of knee | — |
| M23.64 | Other spontaneous disruption of lateral collateral ligament of knee | — |
| M23.67 | Other spontaneous disruption of capsular ligament of knee | — |
| M23.67 | Other spontaneous disruption of capsular ligament of knee | — |
| M23.069 | Cystic meniscus, other lateral meniscus, unspecified knee | ✓ |
| M23.069 | Cystic meniscus, other lateral meniscus, unspecified knee | ✓ |
| M23.90 | Unspecified internal derangement of unspecified knee | ✓ |
| M23.90 | Unspecified internal derangement of unspecified knee | ✓ |
| M23.91 | Unspecified internal derangement of right knee | ✓ |
| M23.91 | Unspecified internal derangement of right knee | ✓ |
| M23.92 | Unspecified internal derangement of left knee | ✓ |
| M23.92 | Unspecified internal derangement of left knee | ✓ |
| M23.200 | Derangement of unspecified lateral meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.201 | 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 | ✓ |
| M23.202 | 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 | ✓ |
| M23.203 | 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 | ✓ |
| M23.204 | 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 | ✓ |
| M23.205 | 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 | ✓ |
| M23.206 | 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 | ✓ |
| M23.207 | 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 | ✓ |
| M23.209 | Derangement of unspecified meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.211 | Derangement of anterior horn of medial meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.212 | 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 | ✓ |
| M23.219 | Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.221 | Derangement of posterior horn of medial meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.222 | 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 | ✓ |
| M23.229 | Derangement of posterior horn of medial meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.231 | Derangement of other medial meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.232 | 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 | ✓ |
| M23.239 | Derangement of other medial meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.241 | Derangement of anterior horn of lateral meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.242 | 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 | ✓ |
| M23.249 | Derangement of anterior horn of lateral meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.251 | Derangement of posterior horn of lateral meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.252 | 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 | ✓ |
| M23.259 | Derangement of posterior horn of lateral meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.261 | Derangement of other lateral meniscus due to old tear or injury, right knee | ✓ |
| 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 | ✓ |
| M23.262 | 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 | ✓ |
| M23.269 | Derangement of other lateral meniscus due to old tear or injury, unspecified knee | ✓ |
| M23.300 | Other meniscus derangements, unspecified lateral meniscus, right knee | ✓ |
| M23.300 | Other meniscus derangements, unspecified lateral meniscus, right knee | ✓ |
| M23.301 | Other meniscus derangements, unspecified lateral meniscus, left knee | ✓ |
| M23.301 | Other meniscus derangements, unspecified lateral meniscus, left knee | ✓ |
| M23.302 | Other meniscus derangements, unspecified lateral meniscus, unspecified knee | ✓ |
| M23.302 | Other meniscus derangements, unspecified lateral meniscus, unspecified knee | ✓ |
| M23.303 | Other meniscus derangements, unspecified medial meniscus, right knee | ✓ |
| M23.303 | Other meniscus derangements, unspecified medial meniscus, right knee | ✓ |
| M23.304 | Other meniscus derangements, unspecified medial meniscus, left knee | ✓ |
| M23.304 | Other meniscus derangements, unspecified medial meniscus, left knee | ✓ |
| M23.305 | Other meniscus derangements, unspecified medial meniscus, unspecified knee | ✓ |
| M23.305 | Other meniscus derangements, unspecified medial meniscus, unspecified knee | ✓ |
| M23.306 | Other meniscus derangements, unspecified meniscus, right knee | ✓ |
| M23.306 | Other meniscus derangements, unspecified meniscus, right knee | ✓ |
| M23.307 | Other meniscus derangements, unspecified meniscus, left knee | ✓ |
| M23.307 | Other meniscus derangements, unspecified meniscus, left knee | ✓ |
| M23.309 | Other meniscus derangements, unspecified meniscus, unspecified knee | ✓ |
| M23.309 | Other meniscus derangements, unspecified meniscus, unspecified knee | ✓ |
| M23.311 | Other meniscus derangements, anterior horn of medial meniscus, right knee | ✓ |
| M23.311 | Other meniscus derangements, anterior horn of medial meniscus, right knee | ✓ |
| M23.312 | Other meniscus derangements, anterior horn of medial meniscus, left knee | ✓ |
| M23.312 | Other meniscus derangements, anterior horn of medial meniscus, left knee | ✓ |
| M23.319 | Other meniscus derangements, anterior horn of medial meniscus, unspecified knee | ✓ |
| M23.319 | Other meniscus derangements, anterior horn of medial meniscus, unspecified knee | ✓ |
| M23.321 | Other meniscus derangements, posterior horn of medial meniscus, right knee | ✓ |
| M23.321 | Other meniscus derangements, posterior horn of medial meniscus, right knee | ✓ |
| M23.322 | Other meniscus derangements, posterior horn of medial meniscus, left knee | ✓ |
| M23.322 | Other meniscus derangements, posterior horn of medial meniscus, left knee | ✓ |
| M23.329 | Other meniscus derangements, posterior horn of medial meniscus, unspecified knee | ✓ |
| M23.329 | Other meniscus derangements, posterior horn of medial meniscus, unspecified knee | ✓ |
| M23.331 | Other meniscus derangements, other medial meniscus, right knee | ✓ |
| M23.331 | Other meniscus derangements, other medial meniscus, right knee | ✓ |
| M23.332 | Other meniscus derangements, other medial meniscus, left knee | ✓ |
| M23.332 | Other meniscus derangements, other medial meniscus, left knee | ✓ |
| M23.339 | Other meniscus derangements, other medial meniscus, unspecified knee | ✓ |
| M23.339 | Other meniscus derangements, other medial meniscus, unspecified knee | ✓ |
| M23.341 | Other meniscus derangements, anterior horn of lateral meniscus, right knee | ✓ |
| M23.341 | Other meniscus derangements, anterior horn of lateral meniscus, right knee | ✓ |
| M23.342 | Other meniscus derangements, anterior horn of lateral meniscus, left knee | ✓ |
| M23.342 | Other meniscus derangements, anterior horn of lateral meniscus, left knee | ✓ |
| M23.349 | Other meniscus derangements, anterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.349 | Other meniscus derangements, anterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.351 | Other meniscus derangements, posterior horn of lateral meniscus, right knee | ✓ |
| M23.351 | Other meniscus derangements, posterior horn of lateral meniscus, right knee | ✓ |
| M23.352 | Other meniscus derangements, posterior horn of lateral meniscus, left knee | ✓ |
| M23.352 | Other meniscus derangements, posterior horn of lateral meniscus, left knee | ✓ |
| M23.359 | Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.359 | Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee | ✓ |
| M23.361 | Other meniscus derangements, other lateral meniscus, right knee | ✓ |
| M23.361 | Other meniscus derangements, other lateral meniscus, right knee | ✓ |
| M23.362 | Other meniscus derangements, other lateral meniscus, left knee | ✓ |
| M23.362 | Other meniscus derangements, other lateral meniscus, left knee | ✓ |
| M23.369 | Other meniscus derangements, other lateral meniscus, unspecified knee | ✓ |
| M23.369 | Other meniscus derangements, other lateral meniscus, unspecified knee | ✓ |
| M23.601 | Other spontaneous disruption of unspecified ligament of right knee | ✓ |
| M23.601 | Other spontaneous disruption of unspecified ligament of right knee | ✓ |
| M23.602 | Other spontaneous disruption of unspecified ligament of left knee | ✓ |
| M23.602 | Other spontaneous disruption of unspecified ligament of left knee | ✓ |
| M23.609 | Other spontaneous disruption of unspecified ligament of unspecified knee | ✓ |
| M23.609 | Other spontaneous disruption of unspecified ligament of unspecified knee | ✓ |
| M23.611 | Other spontaneous disruption of anterior cruciate ligament of right 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 | ✓ |
| M23.612 | Other spontaneous disruption of anterior cruciate ligament of left knee | ✓ |
| M23.619 | Other spontaneous disruption of anterior cruciate ligament of unspecified knee | ✓ |
| M23.619 | Other spontaneous disruption of anterior cruciate ligament of unspecified knee | ✓ |
| M23.621 | Other spontaneous disruption of posterior cruciate ligament of right 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 | ✓ |
| M23.622 | Other spontaneous disruption of posterior cruciate ligament of left knee | ✓ |
| M23.629 | Other spontaneous disruption of posterior cruciate ligament of unspecified knee | ✓ |
| M23.629 | Other spontaneous disruption of posterior cruciate ligament of unspecified knee | ✓ |
| M23.631 | Other spontaneous disruption of medial collateral ligament of right 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 | ✓ |
| M23.632 | Other spontaneous disruption of medial collateral ligament of left knee | ✓ |
| M23.639 | Other spontaneous disruption of medial collateral ligament of unspecified knee | ✓ |
| M23.639 | Other spontaneous disruption of medial collateral ligament of unspecified knee | ✓ |
| M23.641 | Other spontaneous disruption of lateral collateral ligament of right 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 | ✓ |
| M23.642 | Other spontaneous disruption of lateral collateral ligament of left knee | ✓ |
| M23.649 | Other spontaneous disruption of lateral collateral ligament of unspecified knee | ✓ |
| M23.649 | Other spontaneous disruption of lateral collateral ligament of unspecified knee | ✓ |
| M23.671 | Other spontaneous disruption of capsular ligament of right knee | ✓ |
| M23.671 | Other spontaneous disruption of capsular ligament of right knee | ✓ |
| M23.672 | Other spontaneous disruption of capsular ligament of left knee | ✓ |
| M23.672 | Other spontaneous disruption of capsular ligament of left knee | ✓ |
| M23.679 | Other spontaneous disruption of capsular ligament of unspecified knee | ✓ |
| M23.679 | Other spontaneous disruption of capsular ligament of unspecified knee | ✓ |
Frequently asked questions
What is ICD-10-CM code M23?
M23 is an ICD-10-CM category covering Internal derangement of knee. It contains 294 more specific diagnosis codes, 222 of which are billable.
Is M23 a billable code?
No — M23 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M23.0 — Cystic meniscus). 222 of the 294 codes under M23 are billable.
What codes fall under M23?
M23 includes M23.0, M23.0, M23.00, M23.00, M23.000, plus 289 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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