Table 1.

Classification of diabetes mellitus^a

I. Type 1 diabetes

A. Immune-mediated

B. Idiopathic

II. Type 2 diabetes

III. Other specific types

A. Genetic defects of β-cell function

B. Genetic defects in insulin action

C. Diseases of the exocrine pancreas

D. Endocrinopathies

E. Drug- or chemical-induced

F. Infections

G. Uncommon forms of immune-mediated diabetes

H. Other genetic syndromes sometimes associated with diabetes

IV. GDM

^aFrom the ADA (378).