Unsp pre-existing htn comp pregnancy, second trimester

This code signifies a pregnant patient in her second trimester who has a pre-existing history of high blood pressure, but the specific type or severity of that hypertension is not documented. The hypertension is complicating the current pregnancy, meaning it is impacting the course or management of the gestation.

Apply this code when a pregnant patient presents in her second trimester with a documented history of hypertension prior to pregnancy, and the provider explicitly states it is complicating the pregnancy. This code is appropriate when the medical record does not specify the type (e.g., essential, secondary) or severity of the pre-existing hypertension.

• Always sequence this code as a primary diagnosis when the hypertension is the main reason for the encounter or a significant complicating factor.
• Avoid using this code if the documentation specifies the type of pre-existing hypertension (e.g., essential, secondary); instead, use a more specific O10 subcategory.
• Ensure the documentation clearly indicates the pregnancy is in the second trimester and that the hypertension existed prior to conception.