Normally, I'd say asking for a specific percentage is a waste of time as VA assumes that you are asking for the maximum award for any particular disability. That said, I have done it and won. I was awarded 20% radiculopathy for both left and right arms resulting as secondary to my lower back SC. The possibilities for this disability are mild, moderate, and severe. (10-20 and 30%) The C&P report clearly stated "moderate" but the VA rated it as "mild". I filed a NOD requesting the 30% rating for "moderate" and won without having to go to the BVA.