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:

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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 billing and ensures that the diagnostic mammogram, which is more comprehensive, is appropriately billed when initially a screening mammogram was planned.

In the Instance Where a Diagnostic Mammogram Is Converted from Screening