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

This code signifies a pregnant patient with a pre-existing diagnosis of type 2 diabetes mellitus, specifically during her second trimester of gestation. It indicates that the diabetes was present prior to the current pregnancy and is now complicating the pregnancy.

Apply this code when documentation clearly states a patient has a pre-existing type 2 diabetes diagnosis and is currently in her second trimester of pregnancy. Supporting documentation would include physician notes confirming the pre-existing condition, gestational age, and ongoing management of diabetes during pregnancy.

• Always sequence this code as a primary diagnosis when the diabetes is the main reason for the encounter or a significant complicating factor.
• Do not confuse with gestational diabetes (O24.4-) which develops during pregnancy in a patient not previously diabetic.
• Ensure the trimester is accurately documented to select the correct O24.11- subcategory.