ICD-10-CM 2027 diagnosis code
O13Gestational [pregnancy-induced] hypertension without significant proteinuria
O13 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.Short description: Gestational hypertension without significant proteinuria
Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data
About O13
O13 is the ICD-10-CM diagnosis code for gestational [pregnancy-induced] hypertension without significant proteinuria. It belongs to block O10-O16 (edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: O13.1 (first trimester), O13.2 (second trimester), O13.3 (third trimester), O13.4 (complicating childbirth), O13.5 (complicating the puerperium) and O13.9 (unspecified trimester).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under O13
- O13.1Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimesterBillable
- O13.2Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimesterBillable
- O13.3Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimesterBillable
- O13.4Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirthBillable
- O13.5Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating the puerperiumBillable
- O13.9Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimesterBillable
Coding notes
- gestational hypertension NOS
- transient hypertension of pregnancy
Notes that apply from higher levels
Instructions written at a parent level also apply to O13.
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
4 entriesTerms in the official ICD-10-CM index that lead to O13.
- Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › complicating › pregnancy › gestational (pregnancy induced) (without proteinuria)
- Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › complicating › pregnancy › transient
- Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › gestational (without significant proteinuria) (pregnancy-induced) (transient)
- Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › transient › of pregnancy
Codes whose notes reference O13
- I10Excludes1
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O13
Is O13 billable?
- No. O13 is a header code. Report one of its more specific subcodes instead.