Pre-existing secondary hypertension complicating childbirth

This code signifies a patient with pre-existing secondary hypertension who is currently in the childbirth period. Secondary hypertension refers to high blood pressure caused by an underlying medical condition, such as kidney disease or endocrine disorders, that existed prior to the current pregnancy. The "complicating childbirth" aspect indicates that this pre-existing condition is impacting the labor, delivery, or immediate postpartum period.

Apply this code when a pregnant patient with a documented history of secondary hypertension experiences complications related to this condition during labor, delivery, or the immediate postpartum period. Documentation should clearly state the pre-existing nature of the secondary hypertension and its impact on the childbirth encounter. This code is appropriate when the hypertension is not gestational or pre-eclampsia.

• Always sequence this code after the primary obstetric code (e.g., O80 for uncomplicated delivery) if it is a complication.
• Ensure documentation specifies "secondary hypertension" and not just "hypertension" to differentiate from essential hypertension.
• Do not confuse with codes for gestational hypertension (O13.-) or pre-eclampsia (O14.-), which are new-onset conditions during pregnancy.