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ICD-10 Code R94.4: Abnormal results of kidney function studies

R94.4 is a billable ICD-10 diagnosis code used to classify Abnormal results of kidney function studies in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99).

When is it used?

  • May be used when a clinician documents abnormal results of kidney function studies in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
block
R90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis
category
R94Abnormal results of function studies
currentR94

Official coding notes

Inclusion terms
  • Abnormal renal function test

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

General PhysicianUrologist

Coverage-related procedures and services

CPT 36252high
SELECTIVE CATHETER PLACEMENT (FIRST-ORDER), MAIN RENAL ARTERY AND ANY ACCESSORY RENAL ARTERY(S) FOR RENAL ANGIOGRAPHY, INCLUDING ARTERIAL PUNCTURE AND CATHETER PLACEMENT(S), FLUOROSCOPY, CONTRAST INJECTION(S), IMAGE POSTPROCESSING, PERMANENT RECORDING OF IMAGES, AND RADIOLOGICAL SUPERVISION AND INTERPRETATION, INCLUDING PRESSURE GRADIENT MEASUREMENTS WHEN PERFORMED, AND FLUSH AORTOGRAM WHEN PERFORMED; BILATERAL
Source: CMS coverage guidance
CPT 36251high
SELECTIVE CATHETER PLACEMENT (FIRST-ORDER), MAIN RENAL ARTERY AND ANY ACCESSORY RENAL ARTERY(S) FOR RENAL ANGIOGRAPHY, INCLUDING ARTERIAL PUNCTURE AND CATHETER PLACEMENT(S), FLUOROSCOPY, CONTRAST INJECTION(S), IMAGE POSTPROCESSING, PERMANENT RECORDING OF IMAGES, AND RADIOLOGICAL SUPERVISION AND INTERPRETATION, INCLUDING PRESSURE GRADIENT MEASUREMENTS WHEN PERFORMED, AND FLUSH AORTOGRAM WHEN PERFORMED; UNILATERAL
Source: CMS coverage guidance
CPT 36254high
SUPERSELECTIVE CATHETER PLACEMENT (ONE OR MORE SECOND ORDER OR HIGHER RENAL ARTERY BRANCHES) RENAL ARTERY AND ANY ACCESSORY RENAL ARTERY(S) FOR RENAL ANGIOGRAPHY, INCLUDING ARTERIAL PUNCTURE, CATHETERIZATION, FLUOROSCOPY, CONTRAST INJECTION(S), IMAGE POSTPROCESSING, PERMANENT RECORDING OF IMAGES, AND RADIOLOGICAL SUPERVISION AND INTERPRETATION, INCLUDING PRESSURE GRADIENT MEASUREMENTS WHEN PERFORMED, AND FLUSH AORTOGRAM WHEN PERFORMED; BILATERAL
Source: CMS coverage guidance
CPT 36253high
SUPERSELECTIVE CATHETER PLACEMENT (ONE OR MORE SECOND ORDER OR HIGHER RENAL ARTERY BRANCHES) RENAL ARTERY AND ANY ACCESSORY RENAL ARTERY(S) FOR RENAL ANGIOGRAPHY, INCLUDING ARTERIAL PUNCTURE, CATHETERIZATION, FLUOROSCOPY, CONTRAST INJECTION(S), IMAGE POSTPROCESSING, PERMANENT RECORDING OF IMAGES, AND RADIOLOGICAL SUPERVISION AND INTERPRETATION, INCLUDING PRESSURE GRADIENT MEASUREMENTS WHEN PERFORMED, AND FLUSH AORTOGRAM WHEN PERFORMED; UNILATERAL
Source: CMS coverage guidance
CPT 83735high
MAGNESIUM
Source: CMS coverage guidance
CPT 74177high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITH CONTRAST MATERIAL(S)
Source: CMS coverage guidance

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
R94.4

Common synonyms

Abnormal results of kidney function studies

Frequently asked questions

Code details

CodeR94.4
SystemICD10
Display nameAbnormal results of kidney function studies
ChapterSymptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
BlockAbnormal findings on diagnostic imaging and in function studies, without diagnosis

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Abnormal, abnormality, abnormalitiesAbnormal, abnormality, abnormalitiesAbnormal, abnormality, abnormalitiesAbnormal, abnormality, abnormalitiesAbnormal, abnormality, abnormalitiesFindings, abnormal, inconclusive, without diagnosisFindings, abnormal, inconclusive, without diagnosisFindings, abnormal, inconclusive, without diagnosis

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code R94.4 for Abnormal results of kidney function studies | HealthAssure