) reviewed the CPT-4 codes for each study year (Table 1) to identify those that were believed to reflect the most common types of spinal injection procedures that radiologists perform, including lumbar discography (
CPT-4
code 62290), cervical discography (
CPT-4
code 62291), disk aspiration and/or injection (
CPT-4 code 62287), epidural steroid injection (nonselective epidural injection or selective nerve root injection; CPT-4 code 62289 for lumbar injection or 62298 for cervical or thoracic injec