Is diabetes a transmissible disease?

No, diabetes is not catching. Diabetes is caused by either your pancreas not producing insulin or by your body not utilizing it's own insulin properly. There are different types of diabetes and...

Diabetes classes as a condition because it is not contagious like diseases

if you run out of insulin or sugar you could go inot a hypo and die.

Not really. Celiac disease is being allergic to gluten, but diabetes is just having to be careful on not having to high or too low amount of sugar in your blood.

Diabetes is non-communicable indefinetly.