Final answer:
The correct code for a patient admitted for gestational diabetes insulin controlled at 28 weeks gestation is O24.410.
Step-by-step explanation:
The correct code for a patient admitted for gestational diabetes insulin controlled at 28 weeks gestation is O24.410.
When coding for gestational diabetes, the ICD-10-CM code range O24 is used. The fourth character of the code specifies the trimester of pregnancy, and in this case, it is 4 for the patient at 28 weeks gestation. The fifth character indicates the control status of the diabetes, and the correct code option, O24.410, represents insulin-controlled gestational diabetes.