2026 ICD-10-CM Diagnosis Code N06.9Isolated proteinuria with unspecified morphologic lesion

ICD-10-CM Codes›N00–N99›N00-N08›N06

ICD-10-CM N06.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N06.9 is a billable ICD-10-CM diagnosis code for isolated proteinuria with unspecified morphologic lesion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. Coders also document this condition as isolated non-nephrotic proteinuria. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nephritis; nephrosis; renal sclerosis and Proteinuria.

Code Identity

ICD-10-CM Code
N06.9
Billable Status
Yes — Valid for Submission
Code Describes
Isolated proteinuria with unspecified morphologic lesion
Short Description
Isolated proteinuria with unspecified morphologic lesion
Same as the full description in the CMS dataset.
Parent Code
N06
Isolated proteinuria with specified morphological lesion

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN00-N08Glomerular diseases
CategoryN06Isolated proteinuria with specified morphological lesion
This CodeN06.9Isolated proteinuria with unspecified morphologic lesion

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Isolated non-nephrotic proteinuria
  • Isolated proteinuria

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.

    • Proteinuria
      • isolated
        • with glomerular lesion

Clinical ClassificationClinical

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

CCSR GEN001
Nephritis; nephrosis; renal sclerosis
Default principal diagnosis: inpatient No · outpatient No
CCSR GEN010
Proteinuria
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Kidney Diseases

You have two kidneys, each about the size of your fist. They are near the middle of your back, just below the rib cage. Inside each kidney there are about a million tiny structures called nephrons. They filter your blood. They remove wastes and extra water, which become urine. The urine flows through tubes called ureters.

Read the full article at MedlinePlus

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Convert N06.9 to ICD-9-CMHistory

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

ICD-9-CM
583.9 Nephritis NOS
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 N06.9Overview

Is N06.9 (Isolated proteinuria with specified morphological lesion) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report isolated proteinuria with unspecified morphologic lesion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N06.9 group to?

When isolated proteinuria with unspecified morphologic lesion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N06.9?

Under the General Equivalence Mappings, isolated proteinuria with unspecified morphologic lesion converts to ICD-9-CM 583.9 (nephritis NOS). 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.