Gestational diabetes mellitus in pregnancy, unsp control

This code signifies the presence of diabetes that is first diagnosed during pregnancy, where the specific level of glycemic control (e.g., controlled, uncontrolled) is not documented. It indicates a metabolic disorder affecting glucose regulation that arises or is recognized during gestation.

Use this code when a pregnant patient is diagnosed with gestational diabetes, and the medical record does not specify whether the condition is controlled by diet, medication, or remains uncontrolled. This is appropriate when the physician's documentation simply states "gestational diabetes" without further detail on its management or current glycemic status.

• Always attempt to query for more specific documentation regarding glycemic control (e.g., controlled by diet, controlled by insulin) to use a more precise code.
• Do not use this code if the patient had pre-existing diabetes prior to pregnancy; those cases are coded differently.
• Sequence this code as a secondary diagnosis following the appropriate code for the pregnancy itself (e.g., from category Z3A).