If a patient has two total bilirubin tests performed on the same day, one in the morning and one in the afternoon, which modifier is appropriate to append to the second CPT code?

Question

Quizplus · Accepted Answer

Modifier 91 is used to indicate a repeat clinical diagnostic laboratory test performed on the same day, to either ensure the initial results were accurate or to monitor the levels of certain conditions. This is appropriate for the scenario described, where a patient has two total bilirubin tests in one day.

If a Patient Has Two Total Bilirubin Tests Performed on the Same