Algoneurodystrophy

This code describes algoneurodystrophy, also known as Reflex Sympathetic Dystrophy (RSD) or Complex Regional Pain Syndrome (CRPS) Type I. It is a chronic, progressive neurological condition characterized by severe pain, swelling, changes in skin temperature and color, and functional impairment, typically affecting an extremity following trauma or surgery.

Use this code when documentation clearly indicates a diagnosis of algoneurodystrophy or RSD, particularly in cases where a specific nerve lesion is not identified (CRPS Type I). This diagnosis is often supported by clinical findings such as allodynia, hyperalgesia, edema, sudomotor abnormalities, and trophic changes.

• Differentiate from CRPS Type II (causalgia), which involves a confirmed nerve injury and would be coded elsewhere.
• Ensure documentation specifies the affected extremity if possible, though this code is non-site-specific.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, or as a secondary diagnosis if it's a co-morbidity.