Pre-exist type 2 diabetes, in pregnancy, unsp trimester

This code signifies a pregnant patient who has a pre-existing diagnosis of type 2 diabetes mellitus. It indicates that the diabetes was present prior to the current pregnancy and does not specify the trimester of pregnancy.

Apply this code when documentation clearly states the patient has pre-existing type 2 diabetes and is currently pregnant, without specifying the trimester. This is appropriate for initial encounters or when the trimester is not yet determined or documented.

• Always sequence this code after the obstetric code (e.g., O09.-, Z3A.-) to indicate the pregnancy.
• Do not use this code for gestational diabetes, which develops during pregnancy.
• Ensure documentation specifies "pre-existing" or "history of" type 2 diabetes to differentiate from gestational diabetes.