Idiopathic gout, right knee

This code signifies a diagnosis of gout, a form of inflammatory arthritis caused by hyperuricemia, specifically affecting the right knee without an identifiable secondary cause. The condition is characterized by sudden, severe attacks of pain, swelling, redness, and tenderness in the joint.

Apply this code when documentation confirms a diagnosis of primary (idiopathic) gout localized to the right knee. This typically involves clinical presentation, elevated serum uric acid levels, and often synovial fluid analysis showing monosodium urate crystals. Use when the physician explicitly states "idiopathic gout of the right knee" or similar.

• Ensure documentation specifies "idiopathic" or "primary" gout; otherwise, consider codes for secondary gout.
• Laterality is crucial; verify the right knee is explicitly documented.
• Do not confuse with pseudogout (calcium pyrophosphate deposition disease), which has different ICD-10-CM codes.