Pre-existing secondary htn comp pregnancy, first trimester

This code signifies a patient with a pre-existing diagnosis of secondary hypertension who is currently in her first trimester of pregnancy. Secondary hypertension indicates that the high blood pressure is caused by an underlying medical condition, rather than being primary (essential) hypertension. The pregnancy is complicated by this pre-existing hypertensive state.

This code is appropriate when a pregnant patient, specifically in her first trimester, has a documented history of secondary hypertension that predates the current pregnancy. Documentation should clearly state the type of hypertension (secondary), its pre-existing nature, and the current gestational trimester. This code would be used in conjunction with a code for the underlying cause of the secondary hypertension.

• Always code the underlying cause of the secondary hypertension first, followed by this code.
• Distinguish carefully between pre-existing hypertension (O10.-) and gestational hypertension (O13.-) or pre-eclampsia (O14.-).
• Ensure the medical record explicitly states "first trimester" for accurate trimester-specific coding.