A therapeutic colonoscopy is performed, where the scope goes beyond the splenic flexure, but not...

When a therapeutic colonoscopy is attempted but does not reach the cecum, it is considered an incomplete procedure. According to the CPT® Colonoscopy Decision Tree, if the colonoscopy extends beyond the splenic flexure but does not reach the cecum, the appropriate way to code this incomplete colonoscopy is by appending modifier 53 to indicate a discontinued procedure due to extenuating circumstances or risk to the patient.

A. 45378-53 is the correct answer as it designates a diagnostic colonoscopy with modifier 53, signifying that the procedure was started but not completed.

B. 45330 is incorrect as it represents a sigmoidoscopy, which only goes up to the splenic flexure.

C. 45331-45347 refers to therapeutic colonoscopies that were completed to the cecum.

D. 45379-45398 with modifier 52 is incorrect because modifier 52 is used for reduced services, which does not accurately describe an incomplete colonoscopy.

Thus, the correct answer is A. 45378-53.