A multicenter, retrospective study of patients with poorly controlled diabetes who have been hospitalized at least once has found that just 22.4% received a change in outpatient diabetes therapy upon discharge. Patients were more likely to be prescribed changes in therapy if they had the following characteristics:

Higher preadmission A1C levels.
Higher average blood glucose during admission.
Inpatient hypoglycemia.
Inpatient basal insulin therapy.

Abstract: Journal of Clinical Endocrinology & Metabolism, June 2012.