ICD-10-CM Code M23

Internal derangement of knee

Version 2020 Non-Billable Code

Not Valid for Submission

M23 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of internal derangement of knee. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M23
Short Description:Internal derangement of knee
Long Description:Internal derangement of knee

Consider the following ICD-10 codes with a higher level of specificity:

  • 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

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code M23:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • 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

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other joint disorders (M20-M25)
      • Internal derangement of knee (M23)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Knee Injuries and Disorders

Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.

Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair and walking. This can have a big impact on your life.

The most common disease affecting the knee is osteoarthritis. The cartilage in the knee gradually wears away, causing pain and swelling.

Injuries to ligaments and tendons also cause knee problems. A common injury is to the anterior cruciate ligament (ACL). You usually injure your ACL by a sudden twisting motion. ACL and other knee injuries are common sports injuries.

Treatment of knee problems depends on the cause. In some cases your doctor may recommend knee replacement.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


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