Complex regional pain syndrome I of unspecified lower limb

This code signifies Complex Regional Pain Syndrome (CRPS) Type I affecting an unspecified lower extremity. CRPS Type I is a chronic pain condition characterized by severe, burning pain, swelling, and changes in skin temperature or color, typically following an injury or trauma without direct nerve damage.

Use this code when the patient presents with documented CRPS Type I symptoms localized to a lower limb, and the specific limb (left or right) is not specified in the medical record. Documentation should clearly indicate the diagnosis of CRPS Type I and its manifestation in a lower extremity.

• Ensure the documentation explicitly states "CRPS Type I" and not "CRPS Type II," which involves confirmed nerve damage.
• Avoid using this code if the specific lower limb (left or right) is documented; instead, use the more specific codes G90.521 or G90.522.
• Always review the medical record for any underlying cause or associated conditions that may require additional coding.