Have you looked into Non Verbal Learning disorder? Typcially kids with NVLD have good decoding and spelling skills, but struggle with visual perception and visual motor skills and often have difficulties with organization, understanding the big picture and inferencing and or reading between the lines. They are great with facts and figures, but may struggle with abstract concepts. They may learn their math facts easily, but struggle with math concepts.
IDEA does not have a category for NVLD, but does recognize disabilities in some of the component parts: writing, reading comprehension, math, attention etc.
http://www2.scholastic.com/browse/article.jsp?id=3892http://www.nldontheweb.org/
