M23.9
M23.9: Unspecified internal derangement of knee
Non-billable headerICD-10-CMunspecified
M23.9 is a non-billable header ICD-10-CM code for unspecified internal derangement of knee. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1 inherited from the categories above M23.9
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above M23.9
Not part of this code, but both may be coded when both are present.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead M23.9
3 child codes. Green means billable.