M25.26 Flail joint, kneeNon-billable header with 3 child codes.
M25.249 Flail joint, unspecified handM25.25 Flail joint, hipM25.251 Flail joint, right hipM25.252 Flail joint, left hipM25.259 Flail joint, unspecified hipM25.26 Flail joint, knee (this code)M25.261 Flail joint, right kneeM25.262 Flail joint, left kneeM25.269 Flail joint, unspecified kneeM25.27 Flail joint, ankle and footM25.271 Flail joint, right ankle and foot