Algoneurodystrophy, multiple sites

This code describes algoneurodystrophy, also known as complex regional pain syndrome (CRPS) type I, affecting multiple anatomical locations. It is a chronic pain condition characterized by severe, burning pain, swelling, and trophic changes in the affected areas, without evidence of nerve injury. The condition typically develops after trauma or surgery.

Use this code when documentation clearly indicates a diagnosis of algoneurodystrophy or CRPS type I impacting more than one distinct body region. Supporting documentation should detail the presence of pain, allodynia, hyperalgesia, edema, sudomotor abnormalities, and/or trophic changes across multiple sites.

• Ensure the medical record explicitly states "multiple sites" or lists several affected areas to justify using this specific code.
• Distinguish from CRPS type II (causalgia), which involves confirmed nerve injury and is coded differently.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, or as a secondary diagnosis if it complicates another condition.