2026 ICD-10-CM Diagnosis Code O10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

ICD-10-CM Codes›O00-O9A›O10-O16›O10

ICD-10-CM O10
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O10 is a non-billable ICD-10-CM category code for pre-existing hypertension complicating pregnancy, childbirth and the puerperium, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O10.011, O10.012, O10.013, and O10.019.

Code Identity

ICD-10-CM Code
O10
Billable Status
No — Non-Billable Category
Code Describes
Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
Chapter
O10-O16
Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO10-O16Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
CategoryO10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
This CodeO10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

Specific Coding for Pre-existing hypertension compl preg/chldbrthOverview

Non-specific codes like O10 require more characters. Use one of these billable codes instead:

  • O10.0 for Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium

  • O10.01 for Pre-existing essential hypertension complicating pregnancy

  • Use O10.02 for Pre-existing essential hypertension complicating childbirth

  • Use O10.03 for Pre-existing essential hypertension complicating the puerperium

  • O10.1 for Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium

  • O10.11 for Pre-existing hypertensive heart disease complicating pregnancy

  • Use O10.12 for Pre-existing hypertensive heart disease complicating childbirth

  • Use O10.13 for Pre-existing hypertensive heart disease complicating the puerperium

  • O10.2 for Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium

  • O10.21 for Pre-existing hypertensive chronic kidney disease complicating pregnancy

  • Use O10.22 for Pre-existing hypertensive chronic kidney disease complicating childbirth

  • Use O10.23 for Pre-existing hypertensive chronic kidney disease complicating the puerperium

  • O10.3 for Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium

  • O10.31 for Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy

  • Use O10.32 for Pre-existing hypertensive heart and chronic kidney disease complicating childbirth

  • Use O10.33 for Pre-existing hypertensive heart and chronic kidney disease complicating the puerperium

  • O10.4 for Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium

  • O10.41 for Pre-existing secondary hypertension complicating pregnancy

  • Use O10.42 for Pre-existing secondary hypertension complicating childbirth

  • Use O10.43 for Pre-existing secondary hypertension complicating the puerperium

  • O10.9 for Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium

  • O10.91 for Unspecified pre-existing hypertension complicating pregnancy

  • Use O10.92 for Unspecified pre-existing hypertension complicating childbirth

  • Use O10.93 for Unspecified pre-existing hypertension complicating the puerperium

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium

Type 2 Excludes

  • pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium O11

Patient EducationClinical

Health Problems in Pregnancy

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

The full article covers:

  • What are health problems in pregnancy?
  • What raises my risk for health problems during pregnancy?
  • Can chronic health conditions cause problems in pregnancy?
  • Can health problems in pregnancy be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O10Overview

Is O10 a billable code?

No. This is a category header that groups the codes for pre-existing hypertension complicating pregnancy, childbirth and the puerperium, and headers cannot be submitted on claims. Claims for pre-existing hypertension complicating pregnancy, childbirth and the puerperium need a more specific code from this category, such as O10.011, O10.012, and O10.013.