"Then they say that that for every 1 combat death there were 3 from disease."

I always thought that too, Colonel, but see below from Fox's Losses;

" In the report for 1865-6, made by General James B. Fry, United States Provost Marshal-General, there is a tabulation of Confederate losses as compiled from the muster-rolls on file in the Bureau of Confederate Archives. The returns are incomplete, and nearly all the Alabama rolls are missing. Still the figures are worth noting, as they show that at least 74,524 were killed or died of wounds; and, that 59,297 died of disease. From Gen. Fry's tabulation the following abstract is made:" (A state by state list follows. As noted, the numbers are not complete.)

http://www.civilwarhome.com/confederatelosses.htm