Gestational [pregnancy-induced] hypertension without significant proteinuria (O13) ICD-10-CM
The O13 code range covers gestational [pregnancy-induced] hypertension without significant proteinuria with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- gestational hypertension NOS
- transient hypertension of pregnancy
Codes in the O13 Range 7 codes · 6 billable
- O13 Gestational [pregnancy-induced] hypertension without significant proteinuriaNon-billable
- O13.1 Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester
- O13.2 Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimester
- O13.3 Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimester
- O13.4 Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirth
- O13.5 Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating the puerperium
- O13.9 Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester
About the O13 Code Range
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.
Questions About This Page
How many billable codes are in the O13 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O13 range classify?
The range classifies gestational [pregnancy-induced] hypertension without significant proteinuria. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
