2026 ICD-10-CM Diagnosis Code I12.9Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

ICD-10-CM Codes›I00–I99›I10-I1A›I12

ICD-10-CM I12.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I12.9 is a billable ICD-10-CM diagnosis code for hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 682 through 684. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Chronic kidney disease and Hypertension with complications and secondary hypertension.

Code Identity

ICD-10-CM Code
I12.9
Billable Status
Yes — Valid for Submission
Code Describes
Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
Short Description
Hypertensive chronic kidney disease w stg 1-4/unsp chr kdny
Parent Code
I12
Hypertensive chronic kidney disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI10-I1AHypertensive diseases
CategoryI12Hypertensive chronic kidney disease
This CodeI12.9Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arteriolar nephrosclerosis
  • Benign arteriolar nephrosclerosis
  • Benign hypertensive renal disease
  • Benign hypertensive renal disease with renal failure
  • Chronic hypertensive uremia
  • Chronic kidney disease due to benign hypertension
  • Chronic kidney disease due to hypertension
  • Chronic kidney disease stage 1
  • Chronic kidney disease stage 1 due to benign hypertension
  • Chronic kidney disease stage 1 due to hypertension
  • Chronic kidney disease stage 2
  • Chronic kidney disease stage 2 due to benign hypertension
  • Chronic kidney disease stage 2 due to hypertension
  • Chronic kidney disease stage 3 due to benign hypertension
  • Chronic kidney disease stage 3 due to hypertension
  • Chronic kidney disease stage 4 due to benign hypertension
  • Chronic kidney disease stage 4 due to hypertension
  • 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 nephrosclerosis
  • Hypertensive renal disease
  • Hypertensive renal disease complicating AND/OR reason for care during childbirth
  • Hypertensive renal disease complicating AND/OR reason for care during pregnancy
  • Hypertensive renal disease complicating AND/OR reason for care during puerperium
  • Hypertensive renal disease in obstetric context
  • Hypertensive renal failure
  • Malignant arteriolar nephrosclerosis
  • Malignant hypertensive chronic kidney disease
  • Malignant hypertensive chronic kidney disease stage 1
  • Malignant hypertensive chronic kidney disease stage 2
  • Malignant hypertensive chronic kidney disease stage 3
  • Malignant hypertensive chronic kidney disease stage 4
  • Malignant hypertensive renal disease
  • Nephrosclerosis
  • Parenchymal renal hypertension
  • Pre-existing hypertensive chronic kidney disease in mother complicating pregnancy
  • Renal hypertension
  • Renal hypertension complicating pregnancy, childbirth and the puerperium
  • Renal sclerosis with hypertension

Tabular List NotesGuidance

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

Inclusion Terms

  • Hypertensive chronic kidney disease NOS
  • Hypertensive renal disease NOS

Use Additional Code

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)
      • kidney
    • Hypertension, hypertensive(accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
      • kidney
        • with
          • stage 1 through stage 4 chronic kidney disease

Clinical ClassificationClinical

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

CCSR GEN003
Chronic kidney disease
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR008
Hypertension with complications and secondary hypertension
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Nephrosclerosis

    hardening of the kidney due to infiltration by fibrous connective tissue (fibrosis), usually caused by renovascular diseases or chronic hypertension. nephrosclerosis leads to renal ischemia.

  • Chronic Kidney Disease due to Hypertension

    longstanding kidney disease as a complication of hypertension.

  • Renal Hypertension

    hypertension caused by narrowing or occlusion of the renal arteries.

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 I12.9 to ICD-9-CMHistory

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

ICD-9-CM
403.00 Mal hy kid w cr kid I-IV
Approximate The match is approximate rather than exact.
ICD-9-CM
403.10 Ben hy kid w cr kid I-IV
Approximate The match is approximate rather than exact.
ICD-9-CM
403.90 Hy kid NOS w cr kid I-IV
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 I12.9Overview

Is I12.9 (Hypertensive chronic kidney disease) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I12.9 group to?

When hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease is the principal diagnosis on an inpatient stay, it groups to MS-DRG 682, 683, 684, with relative weights from 0.6003 to 1.4810 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I12.9?

Under the General Equivalence Mappings, hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease converts to ICD-9-CM 403.00 (mal hy kid w cr kid I-IV), 403.10 (ben hy kid w cr kid I-IV), and 403.90 (hy kid NOS w cr kid I-IV). 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.