There is another disease that is unrelated to diabetes mellitus, called diabetes insipidus

Diabetes mellitus
Classification and external resources
Insulin is made in beta cells in the pancreas. Problems with insulin causes diabetes.
ICD-10	E10.–E14.
ICD-9	250
MedlinePlus	001214
eMedicine	med/546 emerg/134
MeSH	C18.452.394.750

Diabetes is a condition that results from lack of the hormone insulin in a person's blood, or when the body has a problem using the insulin it produces (insulin resistance). There is another disease with a similar name, diabetes insipidus, however, they are not related. When people say "diabetes", they usually mean diabetes mellitus. People with diabetes Mellitus are called "diabetics".