ICD-10-CM › M00-M99 › M20-M25 › M23.4 Loose body in knee › M23.42
Loose body in knee, left knee
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 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.
- FY2007 Added to the draft code set draft Loose body in knee, left 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.
- Mice, joint
- Rice bodies
- Joint > mice
- Mouse, joint
- Change > joint
- Mushrooming hip
- Snapping > knee
- Loose > cartilage
- Change > hip joint
- Body, bodies > rice
- Floating > cartilage
- Derangement > shoulder
- Locking > joint > knee
- Derangement > joint > knee
- Derangement > cartilage NEC
- Floating > cartilage > knee
- Lax, laxity > ligament > knee
- Cyst > intraligamentous > knee
- Disorder > joint > derangement
- Derangement > joint > loose body
- Disruption > ligament > knee > old
- Disorder > cartilage > articular NEC
- Tear, torn > articular cartilage, old
- Tear, torn > cartilage > articular, old
- Body, bodies > loose > joint, except knee
- Disruption > ligament > knee > spontaneous NEC
- Degeneration, degenerative > articular cartilage NEC
- Disorder > cartilage > specified type NEC > articular
- Derangement > joint > articular cartilage > loose body
- Mice, joint > knee
- Rice bodies > knee
- Joint > mice > knee
- Loose > body > knee
- Mouse, joint > knee
- Body, bodies > rice > knee
- Loose > body > joint > knee
- Derangement > knee > loose body
- Body, bodies > loose > joint, except knee > knee
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M23.40 | Loose body in knee, unspecified knee | Valid |
| M23.41 | Loose body in knee, right knee | Valid |