ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.4 > M1A.46 M1A.46 Other secondary chronic gout, knee Non-Billable/Non-Specific Codes M1A.461Other secondary chronic gout, right kneeM1A.4610..., without tophus (tophi)M1A.4611..., with tophus (tophi)M1A.462Other secondary chronic gout, left kneeM1A.4620..., without tophus (tophi)M1A.4621..., with tophus (tophi)M1A.469Other secondary chronic gout, unspecified kneeM1A.4690..., without tophus (tophi)M1A.4691..., with tophus (tophi)