Gestational diabetes in pregnancy, insulin controlled

This code signifies gestational diabetes mellitus (GDM) diagnosed during pregnancy, where the patient's blood glucose levels are managed through insulin therapy. It indicates that dietary and lifestyle modifications alone were insufficient, necessitating pharmacological intervention with insulin.

Apply this code when documentation clearly states a diagnosis of gestational diabetes and specifies that the patient is currently on insulin for its management. This includes cases where insulin was initiated during the current pregnancy to control GDM.

• Ensure documentation explicitly states "insulin controlled" for GDM; do not assume insulin use based on other medications.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, followed by codes for any associated complications.
• Do not use this code for pre-existing type 1 or type 2 diabetes in pregnancy; those conditions have separate coding pathways.