Idiopathic gout, multiple sites

This code signifies a form of arthritis characterized by sudden, severe attacks of pain, redness, and tenderness in multiple joints, caused by the deposition of uric acid crystals, without an identifiable secondary cause. It represents a systemic inflammatory response to hyperuricemia affecting more than one anatomical location.

Apply this code when documentation clearly indicates a diagnosis of gout affecting multiple joints, and the physician has explicitly ruled out or not identified any secondary causes such as medication, renal insufficiency, or myeloproliferative disorders. This code is appropriate for initial and subsequent encounters for idiopathic gout with polyarticular involvement.

• Ensure documentation specifies "idiopathic" or "primary" gout and clearly indicates involvement of more than one joint.
• Do not use this code if a secondary cause of gout is identified; instead, select a code from M1A.- (Gout due to other secondary causes).
• Consider sequencing this code after any acute manifestations (e.g., M10.2- for acute tophaceous gout) if both are present and documented.