A: If a high-resolution CT of the chest without contrast that consists of more than just a few extra sections (e.g. supine and prone studies in inspiration and expiration at multiple levels) is performed to better evaluate the parenchyma, report code 71250 (CT thorax, without contrast) and append a –22 modifier (services provided are greater than those usually required). It is recommended that a report be submitted to justify the use of the –22 modifier. It is not appropriate to code for the high resolution separately as all three acquisitions are "unenhanced" chest CT exams.
When a few additional sections are obtained as part of a CT of a particular anatomical region, they are included in the initial examination and not coded separately. However, if two studies are performed at two separate sessions and based on two separate orders, it would be appropriate to report both studies. In this case, one of the studies would require a modifier to indicate separate and distinct studies.