2026 ICD-10-CM Diagnosis Code O11Pre-existing hypertension with pre-eclampsia

ICD-10-CM Codes›O00-O9A›O10-O16›O11

ICD-10-CM O11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O11 is a non-billable ICD-10-CM category code for pre-existing hypertension with pre-eclampsia, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O11.1, O11.2, O11.3, and O11.4.

Code Identity

ICD-10-CM Code
O11
Billable Status
No — Non-Billable Category
Code Describes
Pre-existing hypertension with pre-eclampsia
Short Description
Pre-existing hypertension with pre-eclampsia
Same as the full description in the CMS dataset.
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
CategoryO11Pre-existing hypertension with pre-eclampsia
This CodeO11Pre-existing hypertension with pre-eclampsia

Specific Coding for Pre-existing hypertension with pre-eclampsiaOverview

Non-specific codes like O11 require more characters. Use one of these billable codes instead:

  • Use O11.1 for Pre-existing hypertension with pre-eclampsia, first trimester

  • Use O11.2 for Pre-existing hypertension with pre-eclampsia, second trimester

  • Use O11.3 for Pre-existing hypertension with pre-eclampsia, third trimester

  • Use O11.4 for Pre-existing hypertension with pre-eclampsia, complicating childbirth

  • Use O11.5 for Pre-existing hypertension with pre-eclampsia, complicating the puerperium

  • Use O11.9 for Pre-existing hypertension with pre-eclampsia, unspecified trimester

Tabular List NotesGuidance

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

Includes

  • conditions in O10
  • pre-eclampsia superimposed pre-existing hypertension

Use Additional Code

  • code from O10

Patient EducationClinical

High Blood Pressure in Pregnancy

Blood pressure is the force of your blood pushing against the walls of your arteries. Your arteries are blood vessels that carry blood from your heart to other parts of your body. High blood pressure, or hypertension, is blood pressure that is higher than normal.

The full article covers:

  • What is high blood pressure in pregnancy?
  • What are the types of high blood pressure in pregnancy?
  • Who is more likely to develop high blood pressure in pregnancy?
  • What are the symptoms of high blood pressure in pregnancy?
  • What problems can high blood pressure in pregnancy cause?
  • How is high blood pressure in pregnancy diagnosed?
  • What are the treatments for high blood pressure in pregnancy?

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 O11Overview

Is O11 (Pre-existing hypertension with pre-eclampsia) a billable code?

No. This is a category header that groups the codes for pre-existing hypertension with pre-eclampsia, and headers cannot be submitted on claims. Claims for pre-existing hypertension with pre-eclampsia need a more specific code from this category, such as O11.1, O11.2, and O11.3.