Radiology Coding Alert

Question: Is there a modifier I can use to let Medicare know I have an ABN on file?


Washington Subscriber


Answer: Modifier GA (Waiver of liability statement on file) should let Medicare know you have an Advance Beneficiary Notice (ABN) on file.

Example: A patient opts to have a screening virtual colonoscopy, so your practice makes sure to get an ABN on file. The ABN instructs the patient that you suspect Medicare won't pay for the service and the patient must choose whether he is willing to receive the service knowing he may have to pay. The ABN should include an estimate of the cost, and you should have the patient sign and date the document. You report 0066T (Computed tomographic colonography [i.e., virtual colonoscopy]; screening) and append GA.

Tip: If you don't get a signed ABN, append modifier GZ (Item or service expected to be denied as not reasonable and necessary) to let Medicare know you're aware the payer is unlikely to cover the service but you don't have an ABN.

Also ensure that you don't obtain "blanket" ABN forms from all or most of your patients. You should only obtain ABNs when your practice has ample reason to believe that Medicare will deny the claim.