Beside diabetes, is any other illness that can cause high blood sugar?

There are different types of diabetes and each has a different cause but a blood sugar that is over 200 on more than one occasion is diabetes of some type. There are medications that will result in a high blood sugar, like steroids, and the blood sugar normalizes off the meds. Under certain physiological stress, the blood sugars can be high and then once this is relieved,the blood sugars normalize