Lambdoid craniosynostosis, unilateral

This code describes a congenital anomaly where one of the lambdoid sutures of the skull fuses prematurely. This premature fusion restricts growth on the affected side, leading to an abnormal head shape, often characterized by flattening of the posterior skull on one side and compensatory bulging on the contralateral side.

Use this code for documented cases of unilateral lambdoid craniosynostosis confirmed by physical examination and imaging studies (e.g., CT scan). It is appropriate for initial diagnoses and subsequent encounters related to the management of this specific type of craniosynostosis.

• Differentiate from positional plagiocephaly, which does not involve premature suture fusion.
• Ensure documentation specifies "unilateral" lambdoid involvement; bilateral cases would use a different code.
• Confirm the specific suture involved; other craniosynostosis types (e.g., sagittal, coronal) have distinct codes.