O13.9 Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester

Billable ICD-10-CM code, FY2026.

Applies from O13 Gestational [pregnancy-induced] hypertension without significant proteinuria

Includes

• gestational hypertension NOS
• transient hypertension of pregnancy

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 642.30 Transient hypertension of pregnancy, unspecified as to episode of care or not applicable (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O13.9

Back-references to O13

• Type 1 Excludes: I10 Essential (primary) hypertension ("hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)")
• Type 2 Excludes: O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium ("hypertensive disorders (O10-O16)")

Diagnosis Index entries for O13.9

• Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › complicating › puerperium, pre-existing › pregnancy-induced

Nearby codes

• 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 (this code)