ICD-10 Guide

Abnormal Liver Function Tests

ICD-10 Coding for Abnormal Liver Function Tests(R94.5, K70.10)

PRIMARY SPECIALTYGastroenterology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Abnormal Liver Function Tests?

Abnormal liver function tests (LFTs) refer to laboratory results indicating liver dysfunction, often characterized by elevated levels of liver enzymes such as AST, ALT, ALP, and bilirubin. Key clinical points include: 1) Abnormal LFTs can indicate a range of liver diseases, including hepatitis, cirrhosis, and fatty liver disease. 2) The etiology may involve viral infections, alcohol use, metabolic disorders, or drug toxicity. 3) Clinical presentation may vary from asymptomatic to symptoms such as jaundice, fatigue, and abdominal pain. Typical use cases for this diagnosis code include routine screenings, evaluations of liver disease, and monitoring of patients with known liver conditions. Pathophysiologically, liver dysfunction can disrupt metabolic processes and lead to systemic complications. Clinically, patients may present with nonspecific symptoms or may be identified incidentally during routine blood tests.

Key Clinical Considerations:

Diagnosis requires abnormal results from at least one liver function test, including elevated AST, ALT, ALP, or bilirubin levels.
Signs and symptoms may include jaundice, dark urine, pale stools, fatigue, and abdominal discomfort.
Resolution criteria may involve normalization of liver enzyme levels and resolution of associated symptoms.
Laboratory findings supporting diagnosis include elevated liver enzymes, abnormal bilirubin levels, and imaging studies showing liver abnormalities.

Clinical Information

Clinical Criteria & Documentation Requirements

Essential documentation includes clear identification of abnormal test results, clinical correlation, and any relevant patient history.
Compliant documentation: 'Patient's LFTs show elevated ALT and AST, consistent with suspected hepatitis.' Non-compliant: 'Patient has abnormal tests.'
Documentation template phrases include: 'Liver function tests indicate [specific findings] consistent with [diagnosis].'
Medical necessity documentation must justify the need for testing based on clinical symptoms or risk factors.

Coding Guidelines

Usage Guidelines & Examples

Use R94.5 for abnormal liver function tests without a specific diagnosis; use K70.10 for alcoholic liver disease without cirrhosis.
Do not use these codes for liver conditions that are well-defined and coded separately, such as viral hepatitis (B18.2).
Correct usage example: 'Patient presents with abnormal LFTs, coded as R94.5.' Incorrect: 'Patient has hepatitis, coded as R94.5.'
Common coding errors include misclassifying the underlying cause of liver dysfunction; ensure accurate diagnosis coding.

Code Exclusions

Important Exclusions

Excluded conditions include acute liver failure (K72.0) and chronic viral hepatitis (B18.2) as they have specific codes.
Alternative codes for exclusions may include K71 for toxic liver disease.
Common exclusion errors include coding R94.5 for a well-defined liver condition; ensure specificity.
Certain conditions are excluded to maintain coding accuracy and prevent misrepresentation of the patient's health status.

Specialty Focus

Primary Specialty

Gastroenterology

Specialty Applications

This diagnosis applies to patients with abnormal liver function tests due to various etiologies.
Appropriate in clinical scenarios such as routine health screenings or evaluations for liver disease.
Applicable in both inpatient and outpatient settings, including emergency departments.
Specialty-specific considerations include gastroenterology and hepatology practices focusing on liver health.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

Comprehensive clinical documentation
Accurate code selection based on clinical criteria
Proper exclusion considerations
Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Abnormal liver function tests diagnosed based on elevated ALT and AST levels.'

Template 2

Template: 'Patient presents with jaundice and fatigue consistent with abnormal liver function tests.'

Template 3

Template: 'Diagnostic criteria met: Elevated bilirubin and liver enzymes indicate liver dysfunction.'

Template 4

Template: 'Treatment plan includes lifestyle modifications and monitoring for liver function tests.'

Billing Information

Billing Considerations

Ensure proper documentation for billing
Verify code specificity requirements
Check for any additional codes needed
Review payer-specific guidelines

Common Issues

Insufficient clinical documentation
Incorrect code selection
Missing supporting diagnoses
Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this code?

Detailed documentation of abnormal test results, clinical correlation, and patient history.

When should this code be used vs similar codes?

Use R94.5 for nonspecific abnormal tests; use specific codes for defined liver diseases.

What are common billing issues with this code?

Reimbursement may be denied if documentation does not support medical necessity.

What procedures are commonly associated?

Related CPT codes include 80076 for liver function tests and 99213 for office visits.

What is Abnormal Liver Function Tests?

Key Clinical Considerations:

Diagnosis requires abnormal results from at least one liver function test, including elevated AST, ALT, ALP, or bilirubin levels.
Signs and symptoms may include jaundice, dark urine, pale stools, fatigue, and abdominal discomfort.
Resolution criteria may involve normalization of liver enzyme levels and resolution of associated symptoms.
Laboratory findings supporting diagnosis include elevated liver enzymes, abnormal bilirubin levels, and imaging studies showing liver abnormalities.

Abnormal Liver Function Tests

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?

Abnormal Liver Function Tests

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?