Some state guidelines does require the use of DRG's, usually if the ASC is on a hospital campus or operating under the same Tax ID. But the freestanding ASC's normally do not use DRG's. (but as you know, these coding and billing guidelines are subject to change without notice) If you are using a hospital abstracting software, it usually has the DRG sector in it. Or you can purchase the DRG book, it usually runs about $100. (try ingenix, the AMA, etc) thanks, Connie