ICD-10-CM › M00-M99 › M20-M25 › M23 Internal derangement of knee › M23.5
Chronic instability of knee
Not billableICD-10-CM diagnosis code.
This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.
Submit one of these 3 more specific codes instead:
What has happened to this code
Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2012 Added to the draft code set draft Chronic instability of knee
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M23 Internal derangement of knee
Excludes1 - never coded here
- ankylosis (M24.66)
- deformity of knee (M21.-)
- osteochondritis dissecans (M93.2)
Excludes2 - 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)
Inherited from the M20-M25 section Other joint disorders (M20-M25)
Excludes2 - not included here
- joints of the spine (M40-M54)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Change > joint
- Mushrooming hip
- Snapping > knee
- Change > hip joint
- Derangement > shoulder
- Locking > joint > knee
- Derangement > joint > knee
- Lax, laxity > ligament > knee
- Cyst > intraligamentous > knee
- Disorder > joint > derangement
- Disruption > ligament > knee > old
- Disruption > ligament > knee > spontaneous NEC
- Instability > knee
- Derangement > knee > ligament disruption, spontaneous > instability, chronic
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M23.0 | Cystic meniscus | Not billable |
| M23.2 | Derangement of meniscus due to old tear or injury | Not billable |
| M23.3 | Other meniscus derangements | Not billable |
| M23.4 | Loose body in knee | Not billable |
| M23.6 | Other spontaneous disruption of ligament(s) of knee | Not billable |
| M23.8 | Other internal derangements of knee | Not billable |
| M23.9 | Unspecified internal derangement of knee | Not billable |