Gestational htn w/o significant proteinuria, first trimester

This code signifies elevated blood pressure that develops during the first trimester of pregnancy in a patient who previously had normal blood pressure. Importantly, there is no evidence of significant proteinuria, which differentiates it from pre-eclampsia. This condition is also known as pregnancy-induced hypertension.

Apply this code when a pregnant patient presents with new-onset hypertension (systolic BP ≥140 mmHg or diastolic BP ≥90 mmHg) before 20 weeks of gestation, and urinalysis or 24-hour urine collection confirms the absence of significant protein. Documentation should clearly state the gestational age at diagnosis and the lack of proteinuria.

• Ensure the documentation explicitly states "first trimester" or a gestational age less than 14 weeks.
• Distinguish carefully from pre-existing hypertension (O10.-) or gestational hypertension with significant proteinuria (O14.-).
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when managing other pregnancy-related conditions.