Other pre-existing diabetes mellitus in childbirth

This code signifies a pregnant patient with a pre-existing form of diabetes mellitus, other than Type 1 or Type 2, who is currently in the process of childbirth. This includes conditions like secondary diabetes due to cystic fibrosis or pancreatectomy, or other specified types of diabetes present before the current pregnancy.

Apply this code when documentation clearly indicates a pregnant patient with a pre-existing, non-Type 1 or Type 2 diabetes diagnosis who is admitted for delivery. Supporting documentation should specify the type of diabetes and confirm its pre-existing nature relative to the current gestation.

• Always sequence this code after the appropriate obstetric code (e.g., O80, O82).
• Do not use this code for gestational diabetes; use codes from category O24.4-.
• Ensure the medical record specifies the type of pre-existing diabetes if known, and that it's not Type 1 or Type 2.