ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.06 M1A.06 Idiopathic chronic gout, knee Non-Billable/Non-Specific Codes M1A.061Idiopathic chronic gout, right kneeM1A.0610..., without tophus (tophi)M1A.0611..., with tophus (tophi)M1A.062Idiopathic chronic gout, left kneeM1A.0620..., without tophus (tophi)M1A.0621..., with tophus (tophi)M1A.069Idiopathic chronic gout, unspecified kneeM1A.0690..., without tophus (tophi)M1A.0691..., with tophus (tophi)