Unspecified internal derangement of knee
Unspecified internal derangement of knee
M23.9 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M23.90 classifies internal derangement of the knee when neither the specific type of derangement nor the laterality (right or left) is documented in the medical record.
M23.91 identifies an internal derangement of the right knee where the specific structure involved — meniscus, ligament, loose body, or other intra-articular component — has not been further defined in the clinical documentation.
M23.92 classifies unspecified internal derangement of the left knee — used when the clinical picture points to a structural knee joint problem on the left side but the specific pathology (meniscal tear, ligament laxity, loose body, etc.) cannot be identified from the documentation.