Algoneurodystrophy, unspecified ankle and foot

This code describes a condition characterized by chronic pain, swelling, and trophic changes in the ankle and foot, resulting from an abnormal response of the nervous system to an injury or other precipitating event. It is a form of complex regional pain syndrome (CRPS) where the specific cause or type of algoneurodystrophy is not documented.

Use this code when documentation indicates algoneurodystrophy affecting the ankle and foot, but the specific type (e.g., reflex sympathetic dystrophy, causalgia) is not specified. This code is appropriate when the laterality of the affected ankle and foot is also not documented.

• Ensure documentation clearly states "algoneurodystrophy" or "CRPS" affecting the ankle and foot, without further specification.
• Avoid using this code if the laterality (left, right, bilateral) of the affected ankle and foot is documented; instead, use a more specific code.
• If the type of algoneurodystrophy (e.g., reflex sympathetic dystrophy) is specified, a more precise code from the M89.0- series should be selected.