M25.15Non-Billable (Header)Fistula, hipChild CodesM25.151Fistula, right hipM25.152Fistula, left hipM25.159Fistula, unspecified hipCode Hierarchy└M25Other joint disorder, not elsewhere classified└M25.1Fistula of joint└M25.15Fistula, hip└M25.15Fistula, hip