ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.4 > M1A.46 > M1A.469 M1A.469 Other secondary chronic gout, unspecified knee Non-Billable/Non-Specific Codes M1A.4690..., without tophus (tophi)M1A.4691..., with tophus (tophi)