Idiopathic chronic gout, unsp ankle and foot, without tophus

This code describes a persistent, long-term form of gout that has no identifiable cause, affecting an unspecified ankle and/or foot. It specifically indicates the absence of tophi, which are deposits of uric acid crystals that can form under the skin or in joints. The condition is characterized by recurrent inflammatory arthritis.

Use this code for patients diagnosed with chronic gout where the etiology is unknown and the affected site is documented as an ankle or foot, but not specified further. Documentation should clearly state "chronic gout," "idiopathic," and confirm the absence of tophi, with the ankle/foot as the affected area.

• Do not use this code if the specific ankle (right or left) or foot (right or left) is documented; instead, use a more specific M1A.07- subcategory.
• Ensure documentation explicitly states "without tophus" to differentiate from codes indicating tophaceous gout.
• If the cause of gout is known (e.g., drug-induced, lead-induced), use a more specific code from categories M10.1- or M10.2-.