Pre-existing type 2 diabetes, in pregnancy, third trimester

This code identifies a pregnant patient who has a pre-existing diagnosis of type 2 diabetes mellitus and is currently in her third trimester of pregnancy. It signifies that the diabetes was present prior to conception and is now complicating the current pregnancy. This condition requires careful management to ensure the health of both the mother and the fetus.

Apply this code when documentation clearly indicates a patient with a pre-existing diagnosis of type 2 diabetes is pregnant and has reached the third trimester. This code is appropriate for encounters related to the management of her diabetes during this specific gestational period. Supporting documentation includes physician notes confirming pre-existing type 2 diabetes and the current gestational trimester.

• Always sequence this code as a primary diagnosis when the diabetes is the main reason for the encounter, or as a secondary diagnosis when it's a complicating factor.
• Do not use this code for gestational diabetes (diabetes that develops during pregnancy) or for type 1 diabetes.
• Ensure the medical record specifies "pre-existing" type 2 diabetes and the "third trimester" to accurately assign this code.