For gestational hypertension, which category coding should be assigned?

The correct coding category for gestational hypertension is O13. This category corresponds specifically to hypertensive disorders of pregnancy, which is pertinent when dealing with hypertension that develops during pregnancy.

O13 indicates gestational hypertension and hypertension that occurs during the second half of pregnancy and resolves after delivery. This is crucial for accurately documenting the condition as it reflects the specific circumstances surrounding the mother's health during gestation.

In understanding the other coding categories, O11 refers to pre-existing hypertension complicating pregnancy, making it suitable for cases where the patient had high blood pressure before pregnancy. O10 denotes essential hypertension, which is hypertension that exists independently of pregnancy. O12 refers to mild pre-eclampsia, which represents a different complication and condition during pregnancy. Hence, these categories do not accurately represent gestational hypertension, underscoring why O13 is the appropriate choice.