ICD-10-CM · Chapter 13 · M00-M99
M23 Internal derangement of knee
Excludes 1 (cannot be coded together)
- ankylosis (M24.66)
- deformity of knee (M21.-)
- osteochondritis dissecans (M93.2)
Excludes 2 (not included here)
- 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)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| M23..0 | Cystic meniscus | No |
| M23..00 | Cystic meniscus, unspecified meniscus | No |
| M23..000 | Cystic meniscus, unspecified lateral meniscus, right knee | Yes |
| M23..001 | Cystic meniscus, unspecified lateral meniscus, left knee | Yes |
| M23..002 | Cystic meniscus, unspecified lateral meniscus, unspecified knee | Yes |
| M23..003 | Cystic meniscus, unspecified medial meniscus, right knee | Yes |
| M23..004 | Cystic meniscus, unspecified medial meniscus, left knee | Yes |
| M23..005 | Cystic meniscus, unspecified medial meniscus, unspecified knee | Yes |
| M23..006 | Cystic meniscus, unspecified meniscus, right knee | Yes |
| M23..007 | Cystic meniscus, unspecified meniscus, left knee | Yes |
| M23..009 | Cystic meniscus, unspecified meniscus, unspecified knee | Yes |
| M23..01 | Cystic meniscus, anterior horn of medial meniscus | No |
| M23..011 | Cystic meniscus, anterior horn of medial meniscus, right knee | Yes |
| M23..012 | Cystic meniscus, anterior horn of medial meniscus, left knee | Yes |
| M23..019 | Cystic meniscus, anterior horn of medial meniscus, unspecified knee | Yes |
| M23..02 | Cystic meniscus, posterior horn of medial meniscus | No |
| M23..021 | Cystic meniscus, posterior horn of medial meniscus, right knee | Yes |
| M23..022 | Cystic meniscus, posterior horn of medial meniscus, left knee | Yes |
| M23..029 | Cystic meniscus, posterior horn of medial meniscus, unspecified knee | Yes |
| M23..03 | Cystic meniscus, other medial meniscus | No |
| M23..031 | Cystic meniscus, other medial meniscus, right knee | Yes |
| M23..032 | Cystic meniscus, other medial meniscus, left knee | Yes |
| M23..039 | Cystic meniscus, other medial meniscus, unspecified knee | Yes |
| M23..04 | Cystic meniscus, anterior horn of lateral meniscus | No |
| M23..041 | Cystic meniscus, anterior horn of lateral meniscus, right knee | Yes |
| M23..042 | Cystic meniscus, anterior horn of lateral meniscus, left knee | Yes |
| M23..049 | Cystic meniscus, anterior horn of lateral meniscus, unspecified knee | Yes |
| M23..05 | Cystic meniscus, posterior horn of lateral meniscus | No |
| M23..051 | Cystic meniscus, posterior horn of lateral meniscus, right knee | Yes |
| M23..052 | Cystic meniscus, posterior horn of lateral meniscus, left knee | Yes |
| M23..059 | Cystic meniscus, posterior horn of lateral meniscus, unspecified knee | Yes |
| M23..06 | Cystic meniscus, other lateral meniscus | No |
| M23..061 | Cystic meniscus, other lateral meniscus, right knee | Yes |
| M23..062 | Cystic meniscus, other lateral meniscus, left knee | Yes |
| M23..069 | Cystic meniscus, other lateral meniscus, unspecified knee | Yes |
| M23..2 | Derangement of meniscus due to old tear or injury | No |
| M23..20 | Derangement of unspecified meniscus due to old tear or injury | No |
| M23..200 | Derangement of unspecified lateral meniscus due to old tear or injury, right knee | Yes |
| M23..201 | Derangement of unspecified lateral meniscus due to old tear or injury, left knee | Yes |
| M23..202 | Derangement of unspecified lateral meniscus due to old tear or injury, unspecified knee | Yes |
| M23..203 | Derangement of unspecified medial meniscus due to old tear or injury, right knee | Yes |
| M23..204 | Derangement of unspecified medial meniscus due to old tear or injury, left knee | Yes |
| M23..205 | Derangement of unspecified medial meniscus due to old tear or injury, unspecified knee | Yes |
| M23..206 | Derangement of unspecified meniscus due to old tear or injury, right knee | Yes |
| M23..207 | Derangement of unspecified meniscus due to old tear or injury, left knee | Yes |
| M23..209 | Derangement of unspecified meniscus due to old tear or injury, unspecified knee | Yes |
| M23..21 | Derangement of anterior horn of medial meniscus due to old tear or injury | No |
| M23..211 | Derangement of anterior horn of medial meniscus due to old tear or injury, right knee | Yes |
| M23..212 | Derangement of anterior horn of medial meniscus due to old tear or injury, left knee | Yes |
| M23..219 | Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified knee | Yes |
| M23..22 | Derangement of posterior horn of medial meniscus due to old tear or injury | No |
| M23..221 | Derangement of posterior horn of medial meniscus due to old tear or injury, right knee | Yes |
| M23..222 | Derangement of posterior horn of medial meniscus due to old tear or injury, left knee | Yes |
| M23..229 | Derangement of posterior horn of medial meniscus due to old tear or injury, unspecified knee | Yes |
| M23..23 | Derangement of other medial meniscus due to old tear or injury | No |
| M23..231 | Derangement of other medial meniscus due to old tear or injury, right knee | Yes |
| M23..232 | Derangement of other medial meniscus due to old tear or injury, left knee | Yes |
| M23..239 | Derangement of other medial meniscus due to old tear or injury, unspecified knee | Yes |
| M23..24 | Derangement of anterior horn of lateral meniscus due to old tear or injury | No |
| M23..241 | Derangement of anterior horn of lateral meniscus due to old tear or injury, right knee | Yes |
| M23..242 | Derangement of anterior horn of lateral meniscus due to old tear or injury, left knee | Yes |
| M23..249 | Derangement of anterior horn of lateral meniscus due to old tear or injury, unspecified knee | Yes |
| M23..25 | Derangement of posterior horn of lateral meniscus due to old tear or injury | No |
| M23..251 | Derangement of posterior horn of lateral meniscus due to old tear or injury, right knee | Yes |
| M23..252 | Derangement of posterior horn of lateral meniscus due to old tear or injury, left knee | Yes |
| M23..259 | Derangement of posterior horn of lateral meniscus due to old tear or injury, unspecified knee | Yes |
| M23..26 | Derangement of other lateral meniscus due to old tear or injury | No |
| M23..261 | Derangement of other lateral meniscus due to old tear or injury, right knee | Yes |
| M23..262 | Derangement of other lateral meniscus due to old tear or injury, left knee | Yes |
| M23..269 | Derangement of other lateral meniscus due to old tear or injury, unspecified knee | Yes |
| M23..3 | Other meniscus derangements | No |
| M23..30 | Other meniscus derangements, unspecified meniscus | No |
| M23..300 | Other meniscus derangements, unspecified lateral meniscus, right knee | Yes |
| M23..301 | Other meniscus derangements, unspecified lateral meniscus, left knee | Yes |
| M23..302 | Other meniscus derangements, unspecified lateral meniscus, unspecified knee | Yes |
| M23..303 | Other meniscus derangements, unspecified medial meniscus, right knee | Yes |
| M23..304 | Other meniscus derangements, unspecified medial meniscus, left knee | Yes |
| M23..305 | Other meniscus derangements, unspecified medial meniscus, unspecified knee | Yes |
| M23..306 | Other meniscus derangements, unspecified meniscus, right knee | Yes |
| M23..307 | Other meniscus derangements, unspecified meniscus, left knee | Yes |
| M23..309 | Other meniscus derangements, unspecified meniscus, unspecified knee | Yes |
| M23..31 | Other meniscus derangements, anterior horn of medial meniscus | No |
| M23..311 | Other meniscus derangements, anterior horn of medial meniscus, right knee | Yes |
| M23..312 | Other meniscus derangements, anterior horn of medial meniscus, left knee | Yes |
| M23..319 | Other meniscus derangements, anterior horn of medial meniscus, unspecified knee | Yes |
| M23..32 | Other meniscus derangements, posterior horn of medial meniscus | No |
| M23..321 | Other meniscus derangements, posterior horn of medial meniscus, right knee | Yes |
| M23..322 | Other meniscus derangements, posterior horn of medial meniscus, left knee | Yes |
| M23..329 | Other meniscus derangements, posterior horn of medial meniscus, unspecified knee | Yes |
| M23..33 | Other meniscus derangements, other medial meniscus | No |
| M23..331 | Other meniscus derangements, other medial meniscus, right knee | Yes |
| M23..332 | Other meniscus derangements, other medial meniscus, left knee | Yes |
| M23..339 | Other meniscus derangements, other medial meniscus, unspecified knee | Yes |
| M23..34 | Other meniscus derangements, anterior horn of lateral meniscus | No |
| M23..341 | Other meniscus derangements, anterior horn of lateral meniscus, right knee | Yes |
| M23..342 | Other meniscus derangements, anterior horn of lateral meniscus, left knee | Yes |
| M23..349 | Other meniscus derangements, anterior horn of lateral meniscus, unspecified knee | Yes |
| M23..35 | Other meniscus derangements, posterior horn of lateral meniscus | No |
| M23..351 | Other meniscus derangements, posterior horn of lateral meniscus, right knee | Yes |
| M23..352 | Other meniscus derangements, posterior horn of lateral meniscus, left knee | Yes |
| M23..359 | Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee | Yes |
| M23..36 | Other meniscus derangements, other lateral meniscus | No |
| M23..361 | Other meniscus derangements, other lateral meniscus, right knee | Yes |
| M23..362 | Other meniscus derangements, other lateral meniscus, left knee | Yes |
| M23..369 | Other meniscus derangements, other lateral meniscus, unspecified knee | Yes |
| M23..4 | Loose body in knee | No |
| M23..40 | Loose body in knee, unspecified knee | Yes |
| M23..41 | Loose body in knee, right knee | Yes |
| M23..42 | Loose body in knee, left knee | Yes |
| M23..5 | Chronic instability of knee | No |
| M23..50 | Chronic instability of knee, unspecified knee | Yes |
| M23..51 | Chronic instability of knee, right knee | Yes |
| M23..52 | Chronic instability of knee, left knee | Yes |
| M23..6 | Other spontaneous disruption of ligament(s) of knee | No |
| M23..60 | Other spontaneous disruption of unspecified ligament of knee | No |
| M23..601 | Other spontaneous disruption of unspecified ligament of right knee | Yes |
| M23..602 | Other spontaneous disruption of unspecified ligament of left knee | Yes |
| M23..609 | Other spontaneous disruption of unspecified ligament of unspecified knee | Yes |
| M23..61 | Other spontaneous disruption of anterior cruciate ligament of knee | No |
| M23..611 | Other spontaneous disruption of anterior cruciate ligament of right knee | Yes |
| M23..612 | Other spontaneous disruption of anterior cruciate ligament of left knee | Yes |
| M23..619 | Other spontaneous disruption of anterior cruciate ligament of unspecified knee | Yes |
| M23..62 | Other spontaneous disruption of posterior cruciate ligament of knee | No |
| M23..621 | Other spontaneous disruption of posterior cruciate ligament of right knee | Yes |
| M23..622 | Other spontaneous disruption of posterior cruciate ligament of left knee | Yes |
| M23..629 | Other spontaneous disruption of posterior cruciate ligament of unspecified knee | Yes |
| M23..63 | Other spontaneous disruption of medial collateral ligament of knee | No |
| M23..631 | Other spontaneous disruption of medial collateral ligament of right knee | Yes |
| M23..632 | Other spontaneous disruption of medial collateral ligament of left knee | Yes |
| M23..639 | Other spontaneous disruption of medial collateral ligament of unspecified knee | Yes |
| M23..64 | Other spontaneous disruption of lateral collateral ligament of knee | No |
| M23..641 | Other spontaneous disruption of lateral collateral ligament of right knee | Yes |
| M23..642 | Other spontaneous disruption of lateral collateral ligament of left knee | Yes |
| M23..649 | Other spontaneous disruption of lateral collateral ligament of unspecified knee | Yes |
| M23..67 | Other spontaneous disruption of capsular ligament of knee | No |
| M23..671 | Other spontaneous disruption of capsular ligament of right knee | Yes |
| M23..672 | Other spontaneous disruption of capsular ligament of left knee | Yes |
| M23..679 | Other spontaneous disruption of capsular ligament of unspecified knee | Yes |
| M23..8 | Other internal derangements of knee | No |
| M23..8X | Other internal derangements of knee | No |
| M23..8X1 | Other internal derangements of right knee | Yes |
| M23..8X2 | Other internal derangements of left knee | Yes |
| M23..8X9 | Other internal derangements of unspecified knee | Yes |
| M23..9 | Unspecified internal derangement of knee | No |
| M23..90 | Unspecified internal derangement of unspecified knee | Yes |
| M23..91 | Unspecified internal derangement of right knee | Yes |
| M23..92 | Unspecified internal derangement of left knee | Yes |
Last reviewed: September 2026