ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.00 M1A.00 Idiopathic chronic gout, unspecified site Non-Billable/Non-Specific Codes M1A.00X0..., without tophus (tophi)M1A.00X1..., with tophus (tophi)