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

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group O10 includes chronic or pre-existing hypertension that complicates pregnancy, childbirth, and the puerperium, encompassing diagnoses such as chronic hypertension with pregnancy-related complications and specified hypertension control states. These ICD-10-CM diagnosis codes are used to document maternal hypertensive conditions that affect pregnancy management, capture severity and associated complications, and indicate when hypertension predates or coexists with gestation. Accurate coding within the ICD-10-CM O10 group supports proper claim adjudication, complete clinical documentation and appropriate reimbursement.

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ICD-10-CM O10: Pre-existing Hypertension Complicating Pregnancy, Childbirth And The Puerperium Overview

This diagnosis group represents chronic hypertension that is present before pregnancy or diagnosed before 20 weeks gestation and which complicates pregnancy, childbirth, or the puerperium. It targets hypertensive disorders affecting the cardiovascular system with implications for maternal and fetal health. Accurate coding ensures the clinical complexity is documented and supports correct claim adjudication and appropriate reimbursement.

When to Use

Use a code from this group when documenting chronic or pre-existing hypertension that affects pregnancy management, delivery, or the puerperium and is known to be present before pregnancy or early in gestation. Select more specific subcodes when additional detail is available about severity, control, or related obstetric complications.

ICD-10-CM Codes

36 rows

ICD-10-CM Code	Description
O10.011	Pre-existing essential hypertension complicating pregnancy, first trimester
O10.012	Pre-existing essential hypertension complicating pregnancy, second trimester
O10.013	Pre-existing essential hypertension complicating pregnancy, third trimester
O10.019	Pre-existing essential hypertension complicating pregnancy, unspecified trimester
O10.02	Pre-existing essential hypertension complicating childbirth
O10.03	Pre-existing essential hypertension complicating the puerperium
O10.111	Pre-existing hypertensive heart disease complicating pregnancy, first trimester
O10.112	Pre-existing hypertensive heart disease complicating pregnancy, second trimester
O10.113	Pre-existing hypertensive heart disease complicating pregnancy, third trimester
O10.119	Pre-existing hypertensive heart disease complicating pregnancy, unspecified trimester
O10.12	Pre-existing hypertensive heart disease complicating childbirth
O10.13	Pre-existing hypertensive heart disease complicating the puerperium
O10.211	Pre-existing hypertensive chronic kidney disease complicating pregnancy, first trimester
O10.212	Pre-existing hypertensive chronic kidney disease complicating pregnancy, second trimester
O10.213	Pre-existing hypertensive chronic kidney disease complicating pregnancy, third trimester
O10.219	Pre-existing hypertensive chronic kidney disease complicating pregnancy, unspecified trimester
O10.22	Pre-existing hypertensive chronic kidney disease complicating childbirth
O10.23	Pre-existing hypertensive chronic kidney disease complicating the puerperium
O10.311	Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, first trimester
O10.312	Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester

Showing 1–20 of 36

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 34-year-old woman with a documented history of chronic hypertension treated with oral antihypertensives presents at 28 weeks gestation for routine prenatal care with blood pressures persistently in the severe range and new-onset proteinuria on urinalysis. She is evaluated for maternal and fetal status and medication adjustment; a diagnosis from this group is assigned because pre-existing hypertension is complicating the ongoing pregnancy with superimposed preeclampsia features. Typical codes: O10.211, O10.212
A 39-year-old pregnant patient with long-standing controlled hypertension is admitted in active labor at 39 weeks after blood pressure readings are elevated but without proteinuria; she requires intravenous antihypertensive therapy during labor and close intrapartum monitoring. The code from this group is assigned to indicate pre-existing hypertension complicating labor and delivery and to document hypertensive management needs during the intrapartum period. Typical codes: O10.311, O10.312
A 28-year-old postpartum patient with chronic hypertension who delivered three days ago returns to the emergency department with severe headache and markedly elevated blood pressures and evidence of end-organ dysfunction. Because the patient has pre-existing hypertension now complicating the puerperium with acute hypertensive emergency features, a code from this group is used to reflect postpartum hypertensive complications related to her chronic condition. Typical codes: O10.911, O10.912

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

36 rows

ICD-10-CM Code	Description
O10.011	Pre-existing essential hypertension complicating pregnancy, first trimester
O10.012	Pre-existing essential hypertension complicating pregnancy, second trimester
O10.013	Pre-existing essential hypertension complicating pregnancy, third trimester
O10.019	Pre-existing essential hypertension complicating pregnancy, unspecified trimester
O10.02	Pre-existing essential hypertension complicating childbirth
O10.03	Pre-existing essential hypertension complicating the puerperium
O10.111	Pre-existing hypertensive heart disease complicating pregnancy, first trimester
O10.112	Pre-existing hypertensive heart disease complicating pregnancy, second trimester
O10.113	Pre-existing hypertensive heart disease complicating pregnancy, third trimester
O10.119	Pre-existing hypertensive heart disease complicating pregnancy, unspecified trimester
O10.12	Pre-existing hypertensive heart disease complicating childbirth
O10.13	Pre-existing hypertensive heart disease complicating the puerperium
O10.211	Pre-existing hypertensive chronic kidney disease complicating pregnancy, first trimester
O10.212	Pre-existing hypertensive chronic kidney disease complicating pregnancy, second trimester
O10.213	Pre-existing hypertensive chronic kidney disease complicating pregnancy, third trimester
O10.219	Pre-existing hypertensive chronic kidney disease complicating pregnancy, unspecified trimester
O10.22	Pre-existing hypertensive chronic kidney disease complicating childbirth
O10.23	Pre-existing hypertensive chronic kidney disease complicating the puerperium
O10.311	Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, first trimester
O10.312	Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester

Showing 1–20 of 36

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 34-year-old woman with a documented history of chronic hypertension treated with oral antihypertensives presents at 28 weeks gestation for routine prenatal care with blood pressures persistently in the severe range and new-onset proteinuria on urinalysis. She is evaluated for maternal and fetal status and medication adjustment; a diagnosis from this group is assigned because pre-existing hypertension is complicating the ongoing pregnancy with superimposed preeclampsia features. Typical codes: O10.211, O10.212
A 39-year-old pregnant patient with long-standing controlled hypertension is admitted in active labor at 39 weeks after blood pressure readings are elevated but without proteinuria; she requires intravenous antihypertensive therapy during labor and close intrapartum monitoring. The code from this group is assigned to indicate pre-existing hypertension complicating labor and delivery and to document hypertensive management needs during the intrapartum period. Typical codes: O10.311, O10.312
A 28-year-old postpartum patient with chronic hypertension who delivered three days ago returns to the emergency department with severe headache and markedly elevated blood pressures and evidence of end-organ dysfunction. Because the patient has pre-existing hypertension now complicating the puerperium with acute hypertensive emergency features, a code from this group is used to reflect postpartum hypertensive complications related to her chronic condition. Typical codes: O10.911, O10.912

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

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ICD-10-CM O10: Pre-existing Hypertension Complicating Pregnancy, Childbirth And The Puerperium Overview

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

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ICD-10-CM O10: Pre-existing Hypertension Complicating Pregnancy, Childbirth And The Puerperium 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 Complicating Pregnancy Childbirth And The Puerperium: Group Overview

Sign up for ICD-10-CM Code For Pre-existing Hypertension Complicating Pregnancy Childbirth And The Puerperium: Group Overview policy alerts

ICD-10-CM O10: Pre-existing Hypertension Complicating Pregnancy, Childbirth And The Puerperium Overview

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

Sign up for ICD-10-CM Code For Pre-existing Hypertension Complicating Pregnancy Childbirth And The Puerperium: Group Overview policy alerts

ICD-10-CM O10: Pre-existing Hypertension Complicating Pregnancy, Childbirth And The Puerperium Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

When should coder assign an `O10` code for a pregnant patient with hypertension?

How do the `O10` codes capture timing during pregnancy?

How are coexisting cardiac or renal conditions represented in the `O10` group?

Are there codes for secondary or unspecified pre-existing hypertension in pregnancy?

How does accurate use of `O10` codes affect billing and DRG assignment?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

When should coder assign an `O10` code for a pregnant patient with hypertension?

How do the `O10` codes capture timing during pregnancy?

How are coexisting cardiac or renal conditions represented in the `O10` group?

Are there codes for secondary or unspecified pre-existing hypertension in pregnancy?

How does accurate use of `O10` codes affect billing and DRG assignment?

References