By "ASC billers" do you mean billing for the doctors that go to the ASC, or billing for the facility itself?
If for the doctors, I still sequence my CPT codes. Otherwise, how can you get the modifiers on the correct codes? As well, it helps me make sure I've captured everything. For instance, patient comes in for his monthly pain management visit. While here, doctor decides he is going to give a pain shot because the patient fell down yesterday. Sequence:
1. Office visit with 25 modifier.
2. Pain shot delivery 96372
3. Injectables used in pain shot.
Or if he is doing two separate procedures, and I need to put a modifier on one to show it is separate.