2026 ICD-10-CM Diagnosis Code R94.4Abnormal results of kidney function studies

ICD-10-CM Codes›R00–R99›R90-R94›R94

ICD-10-CM R94.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R94.4 is a billable ICD-10-CM diagnosis code for abnormal results of kidney function studies. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 695 through 696. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R94.4
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal results of kidney function studies
Short Description
Abnormal results of kidney function studies
Same as the full description in the CMS dataset.
Parent Code
R94
Abnormal results of function studies

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis
CategoryR94Abnormal results of function studies
This CodeR94.4Abnormal results of kidney function studies

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal renal function
  • Abnormal renin secretion
  • Augmented renal clearance
  • Creatinine clearance below reference range
  • Creatinine clearance-glomerular filtration outside reference range
  • Decreased renal clearance
  • Decreased renal function
  • Decreased renin secretion
  • Glomerular filtration rate above reference range
  • Glomerular filtration rate below reference range
  • Increased amino acid level in urine due to decreased renal function
  • Increased renal clearance
  • Increased renal function
  • Increased renin secretion
  • Renal function tests outside reference range

Tabular List NotesGuidance

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

Inclusion Terms

  • Abnormal renal function test

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.

    • Abnormal, abnormality, abnormalities
      • creatinine clearance
    • Abnormal, abnormality, abnormalities
      • function studies
        • kidney
    • Abnormal, abnormality, abnormalities
      • kidney function test
    • Abnormal, abnormality, abnormalities
      • renal function test
    • Abnormal, abnormality, abnormalities
      • scan
        • kidney
    • Findings, abnormal, inconclusive, without diagnosis
      • creatinine clearance
    • Findings, abnormal, inconclusive, without diagnosis
      • function study NEC
        • kidney
    • Findings, abnormal, inconclusive, without diagnosis
      • scan NEC
        • kidney

Clinical ClassificationClinical

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

CCSR SYM017
Abnormal findings without diagnosis
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 R94.4 to ICD-9-CMHistory

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

ICD-9-CM
794.4 Abn kidney funct study
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 R94.4Overview

Is R94.4 (Abnormal results of function studies) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report abnormal results of kidney function studies on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R94.4 group to?

When abnormal results of kidney function studies is the principal diagnosis on an inpatient stay, it groups to MS-DRG 695, 696, with relative weights from 0.6890 to 1.1438 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R94.4 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormal results of kidney function studies is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R94.4?

Under the General Equivalence Mappings, abnormal results of kidney function studies converts to ICD-9-CM 794.4 (abn kidney funct study). 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.