ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group O11 includes diagnoses of chronic (pre-existing) hypertension in pregnancy that is complicated by pre-eclampsia, often manifesting with new or worsening proteinuria, edema, or end-organ dysfunction. These ICD-10-CM diagnosis codes are used to document clinical scenarios where baseline hypertensive disease is present prior to pregnancy and is complicated by the development of pre-eclampsia, capturing disease severity and maternal organ involvement. Accurate coding within the ICD-10-CM O11 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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ICD-10-CM O11: Pre-existing Hypertension With Pre-Eclampsia Overview

This code group represents cases where a patient has chronic hypertension that is complicated by the development of pre-eclampsia during pregnancy, childbirth, or the puerperium. It targets hypertensive disorders of pregnancy affecting maternal cardiovascular and renal systems, often with proteinuria and edema. Accurate coding matters for proper clinical documentation and can affect reimbursement by reflecting complexity of care.

When to Use

Use a code from this group when a patient with documented pre-existing hypertension develops signs or a diagnosis of pre-eclampsia during pregnancy, labor, delivery, or the postpartum period. Codes are selected to reflect the presence of chronic hypertension with superimposed pre-eclampsia and any documented complications or organ dysfunction.

ICD-10-CM Codes

6 rows

ICD-10-CM Code	Description
O11.1	Pre-existing hypertension with pre-eclampsia, first trimester
O11.2	Pre-existing hypertension with pre-eclampsia, second trimester
O11.3	Pre-existing hypertension with pre-eclampsia, third trimester
O11.4	Pre-existing hypertension with pre-eclampsia, complicating childbirth
O11.5	Pre-existing hypertension with pre-eclampsia, complicating the puerperium
O11.9	Pre-existing hypertension with pre-eclampsia, unspecified trimester

DRG Codes

9 rows

DRG Code	Description
769	Postpartum and Post Abortion Diagnoses with O.R. Procedures
776	Postpartum and Post Abortion Diagnoses without O.R. Procedures
817	Other Antepartum Diagnoses with O.R. Procedures with MCC
818	Other Antepartum Diagnoses with O.R. Procedures with CC
819	Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
831	Other Antepartum Diagnoses without O.R. Procedures with MCC
832	Other Antepartum Diagnoses without O.R. Procedures with CC
833	Other Antepartum Diagnoses without O.R. Procedures without CC/MCC
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Typical Clinical Scenarios

A 32-year-old multiparous woman with a known history of chronic hypertension controlled on labetalol presents at 34 weeks’ gestation with new-onset significant peripheral edema, a blood pressure of 160/105 mmHg, and proteinuria confirmed by urine protein/creatinine ratio. She is evaluated in labor and delivery for worsening hypertension superimposed with features of pre-eclampsia requiring closer maternal-fetal monitoring and medication adjustment; a diagnosis from this group is assigned because chronic hypertension is present prior to 20 weeks and now demonstrates superimposed pre-eclamptic signs. Typical codes: O11.2, O11.4.
A 28-year-old pregnant woman with previously diagnosed hypertension controlled on medication presents to the emergency department at 29 weeks with sudden severe headache, visual disturbances, and blood pressure 180/110 mmHg; urinalysis shows heavy proteinuria and peripheral edema. She requires urgent stabilization, antihypertensive therapy, and expedited obstetric evaluation for severe pre-eclampsia on top of chronic hypertension; a code from this group is used to capture the acute severe superimposed pre-eclamptic state. Typical codes: O11.3, O11.5.
A 36-year-old postpartum patient with long-standing hypertension treated prior to pregnancy is readmitted on postpartum day 4 for persistent hypertension and new-onset proteinuria and lower-extremity swelling after an otherwise uncomplicated delivery. Because chronic hypertension persisted and manifests pre-eclamptic features in the puerperium, a code from this group is assigned to reflect pre-existing hypertension with superimposed pre-eclampsia occurring in the puerperal period. Typical codes: O11.1, O11.9.

ICD-10-CM Code For Pre-existing Hypertension Complicating Pregnancy Childbirth And The Puerperium: Group Overview

O12-GESTATIONAL-EDEMA-AND-PROTEINURIA

ICD-10-CM Code For Gestational Edema And Proteinuria Without Hypertension: Group Overview

O13-GESTATIONAL-HYPERTENSION-WITHOUT-PROTEINURIA

ICD-10-CM Code For Gestational Hypertension Without Significant Proteinuria: Group Overview

O14-PRE-ECLAMPSIA

ICD-10-CM Code For Pre Eclampsia: Group Overview

O15-ECLAMPSIA

ICD-10-CM Code For Eclampsia: Group Overview

O16-UNSPECIFIED-MATERNAL-HYPERTENSION

ICD-10-CM Code For Unspecified Maternal Hypertension: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

6 rows

ICD-10-CM Code	Description
O11.1	Pre-existing hypertension with pre-eclampsia, first trimester
O11.2	Pre-existing hypertension with pre-eclampsia, second trimester
O11.3	Pre-existing hypertension with pre-eclampsia, third trimester
O11.4	Pre-existing hypertension with pre-eclampsia, complicating childbirth
O11.5	Pre-existing hypertension with pre-eclampsia, complicating the puerperium
O11.9	Pre-existing hypertension with pre-eclampsia, unspecified trimester

DRG Codes

9 rows

DRG Code	Description
769	Postpartum and Post Abortion Diagnoses with O.R. Procedures
776	Postpartum and Post Abortion Diagnoses without O.R. Procedures
817	Other Antepartum Diagnoses with O.R. Procedures with MCC
818	Other Antepartum Diagnoses with O.R. Procedures with CC
819	Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
831	Other Antepartum Diagnoses without O.R. Procedures with MCC
832	Other Antepartum Diagnoses without O.R. Procedures with CC
833	Other Antepartum Diagnoses without O.R. Procedures without CC/MCC
[object Object]

Typical Clinical Scenarios

A 32-year-old multiparous woman with a known history of chronic hypertension controlled on labetalol presents at 34 weeks’ gestation with new-onset significant peripheral edema, a blood pressure of 160/105 mmHg, and proteinuria confirmed by urine protein/creatinine ratio. She is evaluated in labor and delivery for worsening hypertension superimposed with features of pre-eclampsia requiring closer maternal-fetal monitoring and medication adjustment; a diagnosis from this group is assigned because chronic hypertension is present prior to 20 weeks and now demonstrates superimposed pre-eclamptic signs. Typical codes: O11.2, O11.4.
A 28-year-old pregnant woman with previously diagnosed hypertension controlled on medication presents to the emergency department at 29 weeks with sudden severe headache, visual disturbances, and blood pressure 180/110 mmHg; urinalysis shows heavy proteinuria and peripheral edema. She requires urgent stabilization, antihypertensive therapy, and expedited obstetric evaluation for severe pre-eclampsia on top of chronic hypertension; a code from this group is used to capture the acute severe superimposed pre-eclamptic state. Typical codes: O11.3, O11.5.
A 36-year-old postpartum patient with long-standing hypertension treated prior to pregnancy is readmitted on postpartum day 4 for persistent hypertension and new-onset proteinuria and lower-extremity swelling after an otherwise uncomplicated delivery. Because chronic hypertension persisted and manifests pre-eclamptic features in the puerperium, a code from this group is assigned to reflect pre-existing hypertension with superimposed pre-eclampsia occurring in the puerperal period. Typical codes: O11.1, O11.9.

ICD-10-CM Code For Pre-existing Hypertension Complicating Pregnancy Childbirth And The Puerperium: Group Overview

O12-GESTATIONAL-EDEMA-AND-PROTEINURIA

ICD-10-CM Code For Gestational Edema And Proteinuria Without Hypertension: Group Overview

O13-GESTATIONAL-HYPERTENSION-WITHOUT-PROTEINURIA

ICD-10-CM Code For Gestational Hypertension Without Significant Proteinuria: Group Overview

O14-PRE-ECLAMPSIA

ICD-10-CM Code For Pre Eclampsia: Group Overview

O15-ECLAMPSIA

ICD-10-CM Code For Eclampsia: Group Overview

O16-UNSPECIFIED-MATERNAL-HYPERTENSION

ICD-10-CM Code For Unspecified Maternal Hypertension: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview

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ICD-10-CM O11: Pre-existing Hypertension With Pre-Eclampsia Overview

ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview

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ICD-10-CM O11: Pre-existing Hypertension With Pre-Eclampsia Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview

Sign up for ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview policy alerts

ICD-10-CM O11: Pre-existing Hypertension With Pre-Eclampsia Overview

ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview

Sign up for ICD-10-CM Code For Pre Existing Hypertension With Pre Eclampsia: Group Overview policy alerts

ICD-10-CM O11: Pre-existing Hypertension With Pre-Eclampsia Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which clinical scenario does the ICD-10-CM O11 group represent?

What specific ICD-10-CM codes are included in the O11 group?

How does accurate coding within the O11 group affect claims and documentation?

Which DRGs are related to diagnoses in the O11 group?

When should `O11.9` be used from this group?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which clinical scenario does the ICD-10-CM O11 group represent?

What specific ICD-10-CM codes are included in the O11 group?

How does accurate coding within the O11 group affect claims and documentation?

Which DRGs are related to diagnoses in the O11 group?

When should `O11.9` be used from this group?

References