Algoneurodystrophy, left upper arm

This code describes algoneurodystrophy, also known as Complex Regional Pain Syndrome (CRPS) Type I, affecting the patient's left upper arm. This condition is characterized by chronic, severe pain, swelling, and trophic changes in the affected limb, typically developing after an injury, surgery, or stroke, but without direct nerve damage.

Use this code when documentation explicitly states a diagnosis of algoneurodystrophy or CRPS Type I localized to the left upper arm. Supporting documentation should detail the characteristic symptoms such as disproportionate pain, allodynia, hyperalgesia, edema, sudomotor abnormalities, and/or trophic changes in the specified limb.

• Ensure laterality is clearly documented for the upper arm (left vs. right).
• Distinguish from CRPS Type II (causalgia), which involves confirmed nerve injury.
• Code any underlying injury or precipitating event separately, if applicable.