ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.04 > M1A.042 M1A.042 Idiopathic chronic gout, left hand Non-Billable/Non-Specific Codes M1A.0420..., without tophus (tophi)M1A.0421..., with tophus (tophi)