2026 ICD-10-CM Diagnosis Code O10.23Pre-existing hypertensive chronic kidney disease complicating the puerperium

ICD-10-CM Codes›O00-O9A›O10-O16›O10

ICD-10-CM O10.23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O10.23 is a billable ICD-10-CM diagnosis code for pre-existing hypertensive chronic kidney disease complicating the puerperium. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as hypertension complicating pregnancy, childbirth and the puerperium. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during the puerperium, Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium, and Hypertension with complications and secondary hypertension.

Code Identity

ICD-10-CM Code
O10.23
Billable Status
Yes — Valid for Submission
Code Describes
Pre-existing hypertensive chronic kidney disease complicating the puerperium
Short Description
Pre-existing hyp chronic kidney disease comp the puerperium
Parent Code
O10.2
Pre-existing hypertensive chronic kidney disease complicating 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 CodeO10.23Pre-existing hypertensive chronic kidney disease complicating the puerperium

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O10.23.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hypertension complicating pregnancy, childbirth and the puerperium
  • Hypertension secondary to renal disease complicating AND/OR reason for care during pregnancy
  • Hypertension secondary to renal disease complicating AND/OR reason for care during puerperium
  • Hypertension secondary to renal disease in obstetric context
  • Hypertensive heart AND renal disease in obstetric context
  • Hypertensive renal disease complicating AND/OR reason for care during puerperium
  • Hypertensive renal disease in obstetric context
  • Renal hypertension complicating pregnancy, childbirth and the puerperium

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Hypertension, hypertensive(accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
      • complicating
        • puerperium, pre-existing
          • pre-existing
            • with
              • renal disease

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG020
Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR008
Hypertension with complications and secondary hypertension
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Chronic Kidney Disease

You have two kidneys, each about the size of your fist. Their main job is to filter your blood. They remove wastes and extra water, which become urine. They also keep the body's chemicals balanced, help control blood pressure, and make hormones.

Read the full article at MedlinePlus

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

Convert O10.23 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
642.24 Old hyperten NEC-postpar
Approximate The match is approximate rather than exact.

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 O10.23Overview

Is O10.23 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pre-existing hypertensive chronic kidney disease complicating the puerperium on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O10.23 be reported for?

The Medicare Code Editor checks pre-existing hypertensive chronic kidney disease complicating the puerperium against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O10.23?

Under the General Equivalence Mappings, pre-existing hypertensive chronic kidney disease complicating the puerperium converts to ICD-9-CM 642.24 (old hyperten NEC-postpar). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.