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 results are consistent or to measure changes in the patient's condition.

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