2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N15.1 is a billable ICD-10-CM diagnosis code for renal and perinephric abscess. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 689 through 690, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 277 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N15.1: its own notes plus those printed at block N10-N16 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block N10-N16 Renal tubulo-interstitial diseases applies to 35 codes
  • pyelonephritis

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block N10-N16 Renal tubulo-interstitial diseases applies to 35 codes
  • pyeloureteritis cystica (N28.85)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N15.1Overview

What is the ICD-10 code for renal and perinephric abscess?

The ICD-10-CM code for renal and perinephric abscess is N15.1 (sometimes written as N151). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 793, 791, 689, 690, with relative weights from 0.8008 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N15.1 a CC or MCC?

CMS lists N15.1 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 277 closely related codes in its exclusion list.

Can N15.1 be reported with N28.85?

Not as a rule. The Excludes1 note at block N10-N16, which applies to N15.1, lists "pyeloureteritis cystica (N28.85)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).