Cephalometric Radiograph

A cephalometric radiograph, commonly called a ceph, is a standardized lateral X-ray of the skull taken with the patient positioned at a fixed distance from the imaging source. This radiograph captures the spatial relationships among the teeth, jaws, and craniofacial skeleton in a single two-dimensional image. Orthodontists and oral surgeons use cephalometric analysis to measure specific skeletal and dental angles, such as the SNA, SNB, and ANB angles, which quantify the anteroposterior relationship of the maxilla and mandible to the cranial base. These measurements guide diagnosis of skeletal malocclusions and help distinguish between dental and skeletal contributors to bite problems.

Cephalometric radiographs serve as baseline records for orthodontic treatment planning and are often required by insurance carriers as part of the preauthorization documentation for complete orthodontic cases. Serial cephalometric images taken before, during, and after treatment allow the clinician to track skeletal and dental changes over time and verify that treatment objectives have been met. In orthognathic surgery cases, the ceph is essential for surgical planning, helping the surgeon determine the magnitude and direction of jaw repositioning required to achieve functional occlusion and facial balance.

For billing staff, the cephalometric radiograph is reported under CDT code D0340. Practices should ensure that the clinical narrative submitted with preauthorization requests references specific cephalometric findings that support the proposed treatment plan, as carriers frequently deny orthodontic claims lacking objective diagnostic evidence. Offices that provide both orthodontic and oral surgery services should verify that duplicate imaging is not billed when the same radiograph serves both diagnostic purposes. Maintaining a consistent protocol for ordering, documenting, and archiving cephalometric images helps dental practices avoid audit exposure and supports clean claim submission.