ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.06 > M1A.061 M1A.061 Idiopathic chronic gout, right knee Non-Billable/Non-Specific Codes M1A.0610..., without tophus (tophi)M1A.0611..., with tophus (tophi)