Cindy,
There are an assortment of registries. As a gastroenterologist, I used the one supported by the AGA. The process was not that bad for me. I had to identify 30 Medicare B patients seen in 2012 who had hepatitis C, and extract certain data on those patients. It was about two hours of work.
There are an a number of registries; I found
this list from CMS. Hopefully you can find one that will work for you.
We are definitely moving from the carrot to the stick phase. When I first did this, the reward was 2% of Medicare billings, which was substantial. Now it is down to 0.5% (barely worth the effort). Soon it moves to a penalty.