2027 ICD-10-CM Diagnosis Code N25.9Disorder resulting from impaired renal tubular function, unspecified

ICD-10-CM Codes›N00–N99›N25-N29›N25

ICD-10-CM N25.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N25.9 is a billable ICD-10-CM diagnosis code for disorder resulting from impaired renal tubular function, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of kidney and ureters.

Code Identity

ICD-10-CM Code
N25.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder resulting from impaired renal tubular function, unspecified
Short Description
Disorder rslt from impaired renal tubular function, unsp
Parent Code
N25
Disorders resulting from impaired renal tubular function

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN25-N29Other disorders of kidney and ureter
CategoryN25Disorders resulting from impaired renal tubular function
This CodeN25.9Disorder resulting from impaired renal tubular function, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal renal function
  • Abnormal renal tubular function
  • Azotemia
  • Coenzyme Q10 deficiency
  • Encephalopathy, hypertrophic cardiomyopathy, renal tubular disease syndrome
  • Hypertrophic cardiomyopathy and renal tubular disease due to mitochondrial DNA mutation
  • Hypertrophic mitochondrial cardiomyopathy
  • Inherited renal tubule insufficiency with cholestatic jaundice
  • Mitochondrial DNA depletion syndrome encephalomyopathic form
  • Prerenal azotemia
  • Renal tubular defect
  • Renal tubular disorder
  • Renal tubulopathy with encephalopathy and liver failure syndrome
  • RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy
  • Secondary hypertension due to renal tubular disorder
  • Specific renal tubule transport defect

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N25.9: its own notes plus those printed at block N25-N29 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

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 Block N25-N29 Other disorders of kidney and ureter applies to 22 codes
  • disorders of kidney and ureter with urolithiasis (N20-N23)
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 GEN006
Other specified and unspecified diseases of kidney and ureters
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

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

Convert N25.9 to ICD-9-CMHistory

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

ICD-9-CM
588.9 Impaired renal funct NOS
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 N25.9Overview

What is the ICD-10 code for disorder resulting from impaired renal tubular function, unspecified?

The ICD-10-CM code for disorder resulting from impaired renal tubular function, unspecified is N25.9 (sometimes written as N259). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N25.9 (Disorders resulting from impaired renal tubular function) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorder resulting from impaired renal tubular function, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N25.9 group to?

When disorder resulting from impaired renal tubular function, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N25.9?

Under the General Equivalence Mappings, disorder resulting from impaired renal tubular function, unspecified converts to ICD-9-CM 588.9 (impaired renal funct NOS). The mapping is a direct match.