Hi! I have recently taken on a lot more of our billing at my lab and am wanting to know how to bill add-on codes. This has been a problem for us in the past.
Example would be that we received a urine sample and ran the initial screening and basic confirmation testing. The doctor comes back a day or 2 later and wants something else ran on the sample based on the initial results. Since the initial claim has most likely gone out the door, how or can you bill for an add-on test without creating what seems like a duplicate claim. (Pt’s insurance would take the G-code and so another G-code would show up for same DOS….)

Is there a modifier that can be used?

thank you!