2026 ICD-10-CM Diagnosis Code R94.5Abnormal results of liver function studies

ICD-10-CM Codes›R00–R99›R90-R94›R94

ICD-10-CM R94.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R94.5 is a billable ICD-10-CM diagnosis code for abnormal results of liver function studies. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 441 through 443. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as alanine aminotransferase below reference range. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R94.5
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal results of liver function studies
Short Description
Abnormal results of liver 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 CodeR94.5Abnormal results of liver function studies

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alanine aminotransferase below reference range
  • Alanine aminotransferase outside reference range
  • Alkaline phosphatase above reference range
  • Alkaline phosphatase liver isoenzyme above reference range
  • Alkaline phosphatase liver isoenzyme below reference range
  • Aspartate transaminase below reference range
  • Aspartate transaminase level
  • Decreased liver function
  • Liver enzymes outside reference range
  • Liver function tests outside reference range

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
      • function studies
        • liver
    • Elevated, elevation
      • liver function
        • study
    • Findings, abnormal, inconclusive, without diagnosis
      • function study NEC
        • liver

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

Liver Diseases

Your liver is the largest organ inside your body. It helps your body digest food, store energy, and remove poisons.

Read the full article at MedlinePlus

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

Convert R94.5 to ICD-9-CMHistory

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

ICD-9-CM
794.8 Abn liver function 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 R94.5Overview

Is R94.5 (Abnormal results of function studies) a billable code?

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

What MS-DRG does R94.5 group to?

When abnormal results of liver function studies is the principal diagnosis on an inpatient stay, it groups to MS-DRG 441, 442, 443, with relative weights from 0.6997 to 1.7947 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R94.5 be a principal diagnosis?

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

What is the ICD-9 equivalent of R94.5?

Under the General Equivalence Mappings, abnormal results of liver function studies converts to ICD-9-CM 794.8 (abn liver function 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.