Unsp pre-existing hypertension complicating childbirth

This code signifies a pregnant patient with a history of hypertension that existed prior to her current pregnancy, and this pre-existing condition is now complicating the childbirth process. It indicates that the specific type or severity of the pre-existing hypertension is not documented.

Apply this code when documentation clearly states pre-existing hypertension is complicating delivery, but lacks specificity regarding the type (e.g., essential, secondary). Supporting documentation includes physician notes indicating "chronic hypertension complicating labor and delivery" without further detail on the hypertension's nature.

• Always sequence this code as a secondary diagnosis, following the code for the obstetric encounter (e.g., O80-O82).
• Avoid using this code if the documentation specifies the type of pre-existing hypertension (e.g., essential, secondary); instead, use the more specific O10.0-O10.2 codes.
• Do not use for gestational hypertension or pre-eclampsia, which are distinct conditions arising during pregnancy.