Ankylosis, unspecified foot

This code signifies the pathological fusion or immobility of a joint within the foot, where the specific joint affected is not documented. It represents a stiffening or fixation of the foot due to abnormal bone growth or soft tissue contracture, leading to restricted range of motion.

Use this code when documentation clearly indicates ankylosis of the foot but does not specify which particular joint (e.g., talonavicular, subtalar, metatarsophalangeal) is involved. This code is appropriate when the physician's notes describe "foot ankylosis" without further anatomical detail.

• Avoid using this code if a more specific anatomical site of ankylosis within the foot is documented (e.g., M24.671 for right ankle).
• Ensure the documentation supports the "unspecified" nature; if laterality is known but the specific joint is not, use the appropriate laterality code (e.g., M24.674 for unspecified right foot).
• This code should not be used for congenital fusion (e.g., tarsal coalition, Q74.1) or arthrodesis (Z98.1).