CPT® Code 77080

The CPT® Code 77080 refers to a dual-energy X-ray absorptiometry (DXA) procedure specifically designed for conducting a bone density study at one or more sites within the axial skeleton, which includes critical areas such as the hips, pelvis, and spine. This diagnostic imaging technique is essential for measuring bone mass or bone mineral density (BMD), which plays a vital role in diagnosing various bone diseases, evaluating the progression of these diseases, and monitoring the effectiveness of treatment, particularly in cases of osteoporosis. Osteoporosis is a condition that significantly increases the risk of fractures due to decreased bone density. The DXA procedure is notable for its low radiation exposure, approximately one-thirtieth of that associated with a standard chest X-ray, making it a safe option for patients. During the DXA scan, two X-ray beams of differing energy levels are directed at the bones in alternating pulses. The absorption of these beams by the bone is measured, while soft tissue absorption is effectively subtracted out, allowing for an accurate determination of BMD based on the bone's absorption characteristics. The results of the DXA scan are then compared to a reference standard, which is the average bone density of a same-sex individual at the age of 30, as this age represents the peak bone mass for both males and females. The difference between the patient's measured BMD and the standard is expressed as a T score. A T score ranging from -1.0 to -2.4 indicates the presence of osteopenia, a condition characterized by lower than normal bone density, while a T score of -2.5 or lower confirms a diagnosis of osteoporosis. To report a DXA bone density study focusing on the axial skeleton, the appropriate code to use is 77080, whereas for studies assessing the appendicular or peripheral skeleton, such as the radius, ulna, wrist, or heel, the code 77081 should be utilized.