ICD-10-CM › M00-M99 › M20-M25 › M22.4 Chondromalacia patellae › M22.40
Chondromalacia patellae, unspecified 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 Chondromalacia patellae, unspecified 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 M22 Disorder of patella
Excludes2 - not included here
- traumatic dislocation of patella (S83.0-)
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.
- Chondritis > patella, posttraumatic
- Disorder > patella > chondromalacia
- Chondromalacia > patella
- Chondromalacia > knee > patella
- Softening > cartilage > patella
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M22.41 | Chondromalacia patellae, right knee | Valid |
| M22.42 | Chondromalacia patellae, left knee | Valid |