2026 ICD-10-CM Diagnosis Code N15.1Renal and perinephric abscess

ICD-10-CM Codes›N00–N99›N10-N16›N15

ICD-10-CM N15.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N15.1 is a billable ICD-10-CM diagnosis code for renal and perinephric abscess. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 689 through 690. Coders also document this condition as perirenal abscess. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Urinary tract infections.

Code Identity

ICD-10-CM Code
N15.1
Billable Status
Yes — Valid for Submission
Code Describes
Renal and perinephric abscess
Short Description
Renal and perinephric abscess
Same as the full description in the CMS dataset.
Parent Code
N15
Other renal tubulo-interstitial diseases

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN10-N16Renal tubulo-interstitial diseases
CategoryN15Other renal tubulo-interstitial diseases
This CodeN15.1Renal and perinephric abscess

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Perirenal abscess
  • Renal abscess
  • Renal and perinephric abscess
  • Retroperitoneal abscess

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.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • kidney
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • paranephric

Clinical ClassificationClinical

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

CCSR GEN004
Urinary tract infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Renal and Perinephric Abscess

    an abscess that is located both in the kidney and across the renal capsule into the perinephric space.

  • Retroperitoneal Abscess

    an abscess that is located in the abdominal cavity posterior to the peritoneum.

Patient EducationClinical

Abscess

An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.

Read the full article at MedlinePlus

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

Convert N15.1 to ICD-9-CMHistory

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

ICD-9-CM
590.2 Renal/perirenal abscess
Exact Match The mapping is direct, with no qualifiers.

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 N15.1Overview

Is N15.1 (Other renal tubulo-interstitial diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report renal and perinephric abscess on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N15.1 group to?

When renal and perinephric abscess is the principal diagnosis on an inpatient stay, it groups to MS-DRG 689, 690, with relative weights from 0.8095 to 1.1603 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N15.1?

Under the General Equivalence Mappings, renal and perinephric abscess converts to ICD-9-CM 590.2 (renal/perirenal abscess). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.