M24.6
M24.6: Ankylosis of joint
Non-billable headerICD-10-CM
M24.6 is a non-billable header ICD-10-CM code for ankylosis of joint. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- stiffness of joint without ankylosis (M25.6-)
Excludes2: not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- spine (M43.2-)
Excludes1 inherited from the categories above M24.6
A category’s note binds every code beneath it.
Written on M24: Other specific joint derangements
- current injury - see injury of joint by body region
Excludes2 inherited from the categories above M24.6
Not part of this code, but both may be coded when both are present.
Other codes that can never be billed with M24.6
Their own Excludes1 notes name this code, so the conflict is not listed above.
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 M24.6
9 child codes. Green means billable.
Other codes under M24
- M24.0Loose body in joint
- M24.1Other articular cartilage disorders
- M24.2Disorder of ligament
- M24.3Pathological dislocation of joint, not elsewhere classified
- M24.4Recurrent dislocation of joint
- M24.5Contracture of joint
- M24.7Protrusio acetabuli
- M24.8Other specific joint derangements, not elsewhere classified
- M24.9Joint derangement, unspecified