For an endoscopic right maxillary antrostomy, what is the correct code to report?

The correct code for an endoscopic right maxillary antrostomy is 31256-RT. This code specifically describes the access and procedure performed in the right maxillary sinus through an endoscopic approach.

In the context of CPT coding, "31256" denotes a surgical intervention that involves the endoscopic approach to the maxillary sinus, which is a common procedure to facilitate drainage or address sinus issues. The "RT" modifier indicates that the procedure was performed on the right side of the body, which is crucial for correctly denoting the specificity of the procedure and ensuring accurate billing and documentation.

The other options represent different procedures that do not apply to the specifics of an endoscopic maxillary antrostomy. Therefore, option A is the only choice that accurately reflects the procedure performed, making it the appropriate code for billing and documentation purposes.