In simple words: This code describes a birth defect affecting the knee.The knee might be bent in a way that it doesn't straighten properly (genu recurvatum) or bent in a way it doesn't straighten or bend enough (genu flexum). This can happen in one or both knees and may be related to other joint problems or be part of a more complex condition.

ICD-10-CM code Q68.2, Congenital deformity of the knee, classifies a range of congenital musculoskeletal abnormalities affecting the knee joint. This includes both congenital genu recurvatum, characterized by hyperextension exceeding 0° with limited flexion, and congenital genu flexum, presenting as persistent flexion contracture with restricted extension.The condition can manifest unilaterally or bilaterally and might be an isolated finding or associated with other orthopedic anomalies, such as developmental dysplasia of the hip or clubfoot, or part of a broader syndrome (e.g., Larsen syndrome, arthrogryposis multiplex congenita).

Example 1: A newborn presents with bilateral knee hyperextension (genu recurvatum), exhibiting limited flexion and prominence of the femoral condyles.Q68.2 is used to code the congenital deformity., A child is diagnosed with unilateral genu flexum, showing a persistent flexion contracture of the left knee joint.Additional imaging and assessment are performed to rule out associated anomalies. Q68.2 is used to code this specific congenital knee malformation., An infant is found to have a congenital knee deformity as part of Larsen syndrome.Q68.2 is used in conjunction with codes for Larsen syndrome to reflect the complete clinical picture.

Complete prenatal and postnatal history; physical examination findings detailing the knee joint range of motion, presence of other musculoskeletal anomalies, and overall physical assessment; radiographic imaging (X-rays) to assess skeletal structure and rule out fractures or dislocations;genetic testing if a syndromic etiology is suspected.

** Differential diagnosis should exclude acquired knee deformities.Consider using additional codes to describe associated findings or syndromic diagnoses.Always refer to the latest official ICD-10-CM guidelines for accurate coding.