Oth pre-existing diabetes in pregnancy, unsp trimester

This code signifies a pregnant patient with a pre-existing diagnosis of diabetes mellitus that is not gestational diabetes, and the specific type of diabetes (e.g., Type 1, Type 2) is not specified. It indicates that the diabetes was present prior to the current pregnancy.

Use this code when documentation confirms a pregnant patient has a history of diabetes mellitus predating the pregnancy, but the medical record does not specify the type of diabetes (e.g., Type 1, Type 2, or other specified types). This code is appropriate when the trimester is also not documented.

• Always strive for greater specificity regarding the type of pre-existing diabetes (e.g., O24.01- for Type 1, O24.11- for Type 2).
• Ensure the documentation clearly states the diabetes was pre-existing, not gestational.
• Sequence this code as a secondary diagnosis following the code for the obstetric encounter.