M25.13Non-Billable (Header)Fistula, wristChild CodesM25.131Fistula, right wristM25.132Fistula, left wristM25.139Fistula, unspecified wristCode Hierarchy└M25Other joint disorder, not elsewhere classified└M25.1Fistula of joint└M25.13Fistula, wrist└M25.13Fistula, wrist