Algoneurodystrophy, unspecified upper arm

This code signifies a complex regional pain syndrome (CRPS) affecting an unspecified upper arm, characterized by severe pain, swelling, and trophic changes. It represents a neurological disorder resulting from an abnormal response to injury or trauma, leading to chronic pain and dysfunction in the affected limb.

Apply this code when documentation clearly indicates algoneurodystrophy (CRPS) impacting the upper arm, without further specification of laterality (left or right). Supporting documentation should detail the characteristic symptoms of CRPS, such as allodynia, hyperalgesia, edema, and skin changes, localized to the upper arm.

• Ensure the documentation explicitly states "unspecified upper arm" or lacks laterality for the upper arm.
• Avoid using this code if laterality (left or right) is specified; instead, use the more specific codes for left or right upper arm algoneurodystrophy.
• Consider sequencing this code after any underlying injury or trauma that may have precipitated the CRPS, if applicable and documented.