Algoneurodystrophy, left ankle and foot

This code describes a neurological disorder characterized by chronic pain, swelling, and trophic changes affecting the left ankle and foot. It is a form of complex regional pain syndrome (CRPS) type I, often triggered by trauma or surgery, but without a demonstrable nerve lesion. The condition involves dysfunction of the sympathetic nervous system, leading to vasomotor and sudomotor abnormalities.

Apply this code when documentation clearly indicates a diagnosis of algoneurodystrophy (CRPS Type I) specifically localized to the patient's left ankle and foot. Supporting documentation should detail the characteristic symptoms such as severe pain disproportionate to the initial injury, edema, skin temperature changes, and motor dysfunction in the specified anatomical region.

• Ensure the documentation specifies "left" ankle and foot; laterality is crucial for accurate coding.
• Distinguish from CRPS Type II (causalgia), which involves a confirmed nerve injury.
• Consider sequencing this code as a primary diagnosis if it is the main reason for the encounter, or as a secondary diagnosis if it's a co-morbidity.