In the instance where a diagnostic mammogram is converted from screening mammogram on the same day, for the same patient, the coder should append modifier:

Question

Quizplus · Accepted Answer

Modifier GH is used to indicate that a screening mammogram was converted to a diagnostic mammogram on the same day, for the same patient. This modifier helps in the billing process to differentiate the services provided.

In the Instance Where a Diagnostic Mammogram Is Converted from Screening