ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.06 > M1A.062 M1A.062 Idiopathic chronic gout, left knee Non-Billable/Non-Specific Codes M1A.0620..., without tophus (tophi)M1A.0621..., with tophus (tophi)