Do you use modifier 51 with add-on codes ?

No, modifier 51 is used to indicate that multiple procedures were performed during the same surgical session. Add-on codes are additional codes used to report procedures that are always performed in conjunction with another primary procedure and do not require a modifier to indicate their relationship to the primary procedure.

Is it appropriate to append modifier 51 to the codes in case of repeated tests in pathology ?

No, it is not appropriate to append modifier 51 to pathology codes for repeated tests. Modifier 51 is used to indicate multiple procedures during the same session or on the same day, and is not typically used for repeated pathology tests. Instead, the appropriate way to bill for repeated pathology tests would be to use the appropriate CPT code for each test performed.

Can modifier 51 be used twice ?

Yes, modifier 51 can be used multiple times on a claim to indicate that multiple procedures were performed during the same operative session. Each instance of the modifier should be used with the appropriate procedure code to indicate that multiple procedures were performed.