Is it possible to have hyperglycemia with no diabetes?

Prediabetes: Hyperglycemia is caused by either not having enough Insulin to carry glucose into your cells (type i) or your cells being insensitive to Insulin (type ii). Prediabetes is a precursor to type ii diabetes that can be reversed with early, aggressive intervention, including regular glucose checks, diet and exercise.

Yes: Some medications like steroids can increase sugar levels, even when you are not a diabetic.