Algoneurodystrophy, unspecified forearm

This code describes algoneurodystrophy, also known as Complex Regional Pain Syndrome (CRPS) Type I, affecting an unspecified forearm. It is a chronic pain condition characterized by severe pain, swelling, changes in skin temperature and color, and limited range of motion, without evidence of nerve injury. The "unspecified" nature indicates that the laterality (left or right) of the affected forearm is not documented.

Use this code when documentation confirms a diagnosis of algoneurodystrophy or CRPS Type I affecting the forearm, and the medical record does not specify whether it is the left or right forearm. This code is appropriate for initial evaluations, follow-up visits, and procedures related to the management of this condition. Supporting documentation should include physician notes detailing the characteristic symptoms of CRPS Type I in the forearm.

• Avoid using this code if the laterality of the affected forearm is documented; instead, use the more specific codes for left (M89.032) or right (M89.031) forearm.
• Ensure the documentation clearly differentiates CRPS Type I (algoneurodystrophy) from CRPS Type II (causalgia), which involves confirmed nerve injury.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when it is a co-morbidity impacting treatment.