Gestational diabetes mellitus in pregnancy, diet controlled

This code signifies gestational diabetes that is diagnosed during pregnancy and is effectively managed through dietary modifications alone. It indicates that the patient's blood glucose levels are controlled without the need for insulin or oral hypoglycemic agents.

Use this code for pregnant patients diagnosed with gestational diabetes whose condition is successfully managed solely through diet. Documentation must explicitly state "diet controlled" or similar phrasing, confirming no pharmacologic intervention is necessary.

• Always confirm documentation specifies "diet controlled" to differentiate from gestational diabetes managed with medication.
• Do not use this code if the patient requires insulin or oral hypoglycemic agents; refer to codes for gestational diabetes with insulin or other treatment.
• Sequence this code as a secondary diagnosis following the code for the current pregnancy (e.g., Z3A.xx).