Answer: Actually, 72050 (Radiologic examination, spine, cervical; minimum of four views) is the code that you should use when you report the scenario that you describe.
You mention that your practice shot AP, lateral, flexion and extension views. This adds up to four views, so 72050 (minimum of four views) is the most accurate choice.
In order to report code 72052 (Radiologic examination, spine, cervical; complete, including oblique and flexion and/or extension studies), your x-ray technologist must document more than four views. These views might include AP, lateral, both obliques (two views), and flexion and extension.