Idiopathic chronic gout, unspecified hand, without tophus

This code signifies a persistent, non-specific form of gout affecting an unspecified hand, where the underlying cause is unknown, and there is no evidence of urate crystal deposits forming visible nodules (tophi). It indicates a long-standing inflammatory arthritis due to uric acid accumulation without the characteristic physical manifestation of tophi.

Apply this code when documentation confirms a diagnosis of chronic gout in the hand, the etiology is idiopathic, and there is no mention of tophaceous deposits. This code is appropriate when the specific hand (left or right) is not documented. Supporting documentation would include physician notes detailing chronic hand pain, elevated uric acid levels, and the absence of tophi.

• Ensure documentation explicitly states "chronic" and "idiopathic" gout.
• Do not use if tophi are present; a different code from the M1A.04 series would be more appropriate.
• If the specific hand is known, use a more specific code (e.g., M1A.0410 for right hand, M1A.0420 for left hand).