Question: North Carolina Subscriber Answer: In case you weren't familiar with exactly when you were supposed to use the ABN rather than the NEMB, keep in mind that in the past, you only used ABNs for procedures or services that Medicare was not likely to provide coverage for. Originally, ABNs didn't apply to procedures or services that were statutorily excluded from Medicare benefits. That was where the NEMB came into play -- you used it for services that Medicare never covered. The revised and updated ABN -- which became effective March 3 -- not only incorporates the NEMB form but also replaces both the previous ABN-G (for physicians) and ABN-L (for laboratories). No need to worry: Where to look: