ICD-10-CM > M00-M99 > M05-M14 > M1A > M1A.0 > M1A.07 > M1A.079 M1A.079 Idiopathic chronic gout, unspecified ankle and foot Non-Billable/Non-Specific Codes M1A.0790..., without tophus (tophi)M1A.0791..., with tophus (tophi)