Gestational [pregnancy-induced] hypertension without significant proteinuria (O13)

ICD-10 code O13 and its subcodes classify gestational hypertension without significant proteinuria, a condition of elevated blood pressure during pregnancy without the presence of excess protein in the urine. These codes capture the timing and pregnancy phase in which this hypertension occurs, including the first, second, and third trimesters, as well as complications during childbirth and the puerperium.

The use of ICD-10 code O13 is specific to cases of gestational [pregnancy-induced] hypertension without proteinuria, which distinguishes it from preeclampsia or other hypertensive disorders with proteinuria. This section covers conditions often referred to by synonyms like transient hypertension of pregnancy, maternal hypertension, non-proteinuric hypertension of pregnancy, and pregnancy-induced hypertension. Coding accurately with these codes helps document when elevated blood pressure develops during pregnancy or postnatally and ensures precise tracking of hypertensive complications that do not involve kidney protein loss. For example, codes O13.1 to O13.3 identify hypertension by trimester, while O13.4 and O13.5 cover hypertension complicating childbirth or the postpartum period, respectively, aiding detailed clinical and billing documentation.