ICD-10-CM category
M23 Internal derangement of knee
M23 is a category, not a billable code. Report one of the 111 complete codes below.
M23.0…
27 codes
- M23.000Cystic meniscus, unspecified lateral meniscus, right knee
- M23.001Cystic meniscus, unspecified lateral meniscus, left knee
- M23.002Cystic meniscus, unspecified lateral meniscus, unspecified knee
- M23.003Cystic meniscus, unspecified medial meniscus, right knee
- M23.004Cystic meniscus, unspecified medial meniscus, left knee
- M23.005Cystic meniscus, unspecified medial meniscus, unspecified knee
- M23.006Cystic meniscus, unspecified meniscus, right knee
- M23.007Cystic meniscus, unspecified meniscus, left knee
- M23.009Cystic meniscus, unspecified meniscus, unspecified knee
- M23.011Cystic meniscus, anterior horn of medial meniscus, right knee
- M23.012Cystic meniscus, anterior horn of medial meniscus, left knee
- M23.019Cystic meniscus, anterior horn of medial meniscus, unspecified knee
- M23.021Cystic meniscus, posterior horn of medial meniscus, right knee
- M23.022Cystic meniscus, posterior horn of medial meniscus, left knee
- M23.029Cystic meniscus, posterior horn of medial meniscus, unspecified knee
- M23.031Cystic meniscus, other medial meniscus, right knee
- M23.032Cystic meniscus, other medial meniscus, left knee
- M23.039Cystic meniscus, other medial meniscus, unspecified knee
- M23.041Cystic meniscus, anterior horn of lateral meniscus, right knee
- M23.042Cystic meniscus, anterior horn of lateral meniscus, left knee
- M23.049Cystic meniscus, anterior horn of lateral meniscus, unspecified knee
- M23.051Cystic meniscus, posterior horn of lateral meniscus, right knee
- M23.052Cystic meniscus, posterior horn of lateral meniscus, left knee
- M23.059Cystic meniscus, posterior horn of lateral meniscus, unspecified knee
- M23.061Cystic meniscus, other lateral meniscus, right knee
- M23.062Cystic meniscus, other lateral meniscus, left knee
- M23.069Cystic meniscus, other lateral meniscus, unspecified knee
M23.2…
27 codes
- M23.200Derangement of unspecified lateral meniscus due to old tear or injury, right knee
- M23.201Derangement of unspecified lateral meniscus due to old tear or injury, left knee
- M23.202Derangement of unspecified lateral meniscus due to old tear or injury, unspecified knee
- M23.203Derangement of unspecified medial meniscus due to old tear or injury, right knee
- M23.204Derangement of unspecified medial meniscus due to old tear or injury, left knee
- M23.205Derangement of unspecified medial meniscus due to old tear or injury, unspecified knee
- M23.206Derangement of unspecified meniscus due to old tear or injury, right knee
- M23.207Derangement of unspecified meniscus due to old tear or injury, left knee
- M23.209Derangement of unspecified meniscus due to old tear or injury, unspecified knee
- M23.211Derangement of anterior horn of medial meniscus due to old tear or injury, right knee
- M23.212Derangement of anterior horn of medial meniscus due to old tear or injury, left knee
- M23.219Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified knee
- M23.221Derangement of posterior horn of medial meniscus due to old tear or injury, right knee
- M23.222Derangement of posterior horn of medial meniscus due to old tear or injury, left knee
- M23.229Derangement of posterior horn of medial meniscus due to old tear or injury, unspecified knee
- M23.231Derangement of other medial meniscus due to old tear or injury, right knee
- M23.232Derangement of other medial meniscus due to old tear or injury, left knee
- M23.239Derangement of other medial meniscus due to old tear or injury, unspecified knee
- M23.241Derangement of anterior horn of lateral meniscus due to old tear or injury, right knee
- M23.242Derangement of anterior horn of lateral meniscus due to old tear or injury, left knee
- M23.249Derangement of anterior horn of lateral meniscus due to old tear or injury, unspecified knee
- M23.251Derangement of posterior horn of lateral meniscus due to old tear or injury, right knee
- M23.252Derangement of posterior horn of lateral meniscus due to old tear or injury, left knee
- M23.259Derangement of posterior horn of lateral meniscus due to old tear or injury, unspecified knee
- M23.261Derangement of other lateral meniscus due to old tear or injury, right knee
- M23.262Derangement of other lateral meniscus due to old tear or injury, left knee
- M23.269Derangement of other lateral meniscus due to old tear or injury, unspecified knee
M23.3…
27 codes
- M23.300Other meniscus derangements, unspecified lateral meniscus, right knee
- M23.301Other meniscus derangements, unspecified lateral meniscus, left knee
- M23.302Other meniscus derangements, unspecified lateral meniscus, unspecified knee
- M23.303Other meniscus derangements, unspecified medial meniscus, right knee
- M23.304Other meniscus derangements, unspecified medial meniscus, left knee
- M23.305Other meniscus derangements, unspecified medial meniscus, unspecified knee
- M23.306Other meniscus derangements, unspecified meniscus, right knee
- M23.307Other meniscus derangements, unspecified meniscus, left knee
- M23.309Other meniscus derangements, unspecified meniscus, unspecified knee
- M23.311Other meniscus derangements, anterior horn of medial meniscus, right knee
- M23.312Other meniscus derangements, anterior horn of medial meniscus, left knee
- M23.319Other meniscus derangements, anterior horn of medial meniscus, unspecified knee
- M23.321Other meniscus derangements, posterior horn of medial meniscus, right knee
- M23.322Other meniscus derangements, posterior horn of medial meniscus, left knee
- M23.329Other meniscus derangements, posterior horn of medial meniscus, unspecified knee
- M23.331Other meniscus derangements, other medial meniscus, right knee
- M23.332Other meniscus derangements, other medial meniscus, left knee
- M23.339Other meniscus derangements, other medial meniscus, unspecified knee
- M23.341Other meniscus derangements, anterior horn of lateral meniscus, right knee
- M23.342Other meniscus derangements, anterior horn of lateral meniscus, left knee
- M23.349Other meniscus derangements, anterior horn of lateral meniscus, unspecified knee
- M23.351Other meniscus derangements, posterior horn of lateral meniscus, right knee
- M23.352Other meniscus derangements, posterior horn of lateral meniscus, left knee
- M23.359Other meniscus derangements, posterior horn of lateral meniscus, unspecified knee
- M23.361Other meniscus derangements, other lateral meniscus, right knee
- M23.362Other meniscus derangements, other lateral meniscus, left knee
- M23.369Other meniscus derangements, other lateral meniscus, unspecified knee
M23.4…
3 codes
M23.5…
3 codes
M23.6…
18 codes
- M23.601Other spontaneous disruption of unspecified ligament of right knee
- M23.602Other spontaneous disruption of unspecified ligament of left knee
- M23.609Other spontaneous disruption of unspecified ligament of unspecified knee
- M23.611Other spontaneous disruption of anterior cruciate ligament of right knee
- M23.612Other spontaneous disruption of anterior cruciate ligament of left knee
- M23.619Other spontaneous disruption of anterior cruciate ligament of unspecified knee
- M23.621Other spontaneous disruption of posterior cruciate ligament of right knee
- M23.622Other spontaneous disruption of posterior cruciate ligament of left knee
- M23.629Other spontaneous disruption of posterior cruciate ligament of unspecified knee
- M23.631Other spontaneous disruption of medial collateral ligament of right knee
- M23.632Other spontaneous disruption of medial collateral ligament of left knee
- M23.639Other spontaneous disruption of medial collateral ligament of unspecified knee
- M23.641Other spontaneous disruption of lateral collateral ligament of right knee
- M23.642Other spontaneous disruption of lateral collateral ligament of left knee
- M23.649Other spontaneous disruption of lateral collateral ligament of unspecified knee
- M23.671Other spontaneous disruption of capsular ligament of right knee
- M23.672Other spontaneous disruption of capsular ligament of left knee
- M23.679Other spontaneous disruption of capsular ligament of unspecified knee
M23.8…
3 codes
M23.9…
3 codes
Outside the US? M23 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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