M24.6
Header — not billable
Ankylosis of joint
Ankylosis of joint
M24.6 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M24.60
Ankylosis, unspecified joint
M24.69 M24.60 identifies ankylosis — abnormal fusion or immobility of a joint — when the specific joint affected is not documented or cannot be determined from the record.
Ankylosis, other specified joint
Ankylosis of a joint not captured by any other site-specific code in the M24.6x series — meaning fibrous or osseous fusion at a location outside shoulder, elbow, wrist, hand, hip, knee, ankle, or foot.
Inclusion & exclusion notes
Excludes 1 (mutually exclusive — never code together)
- stiffness of joint without ankylosis (M25.6-)
Excludes 2 (not included here, but may be coded together if both present)
- spine (M43.2-)