SL, there are criteria to determine whether active UC is mild, moderate or severe. If you meet some but not all of the criteria for severe, I think they code it as moderate to severe. It applies to the colon as a whole. Here's a summary:
Moderate to severe left-sided UC (21 cm) diagnosed 2001.
Asacol, Rowasa, Pentasa, Prednisone, Entocort, Azathioprine
Colazal, Remicade, Nature's Way Primadophilus Reuteri.
In remission since April, 2006. Remicade has been my wonder drug.
Co-Moderator UC Forum