Diabetes mellitus Type I diabetes mellitus A chronic condition in which the pancreas produces little or no insulin. Type I diabetes mellitus is manifested by the sudden onset of severe hyperglycemia with rapid progression to diabetic ketoacidosis unless treated with insulin. Insulin-dependent diabetes mellitus UMLS:C0011854 SNOMEDCT_US:46635009 2010-12-29T06:37:55Z The onset of type 1 diabetes is typically during adolescence, but it can develop at any age. Diabetes mellitus Type I Juvenile diabetes mellitus HP:0100651