M25.42Non-Billable (Header)Effusion, elbowChild CodesM25.421Effusion, right elbowM25.422Effusion, left elbowM25.429Effusion, unspecified elbowCode Hierarchy└M25Other joint disorder, not elsewhere classified└M25.4Effusion of joint└M25.42Effusion, elbow└M25.42Effusion, elbow