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ICD-10 Guide
DiagnosesAbnormal Liver Enzyme

Abnormal Liver Enzyme

ICD-10 Coding for Abnormal Liver Enzyme(R74.01, R94.5)

PRIMARY SPECIALTYGastroenterology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Abnormal Liver Enzyme?
Abnormal liver enzyme levels are indicative of potential liver dysfunction or damage. Key clinical points include: 1) Elevated liver enzymes can signal conditions such as hepatitis, fatty liver disease, or liver cirrhosis. 2) Routine blood tests often reveal abnormal levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST). 3) Symptoms may include fatigue, jaundice, and abdominal discomfort. Etiologically, liver enzyme abnormalities can arise from viral infections, alcohol use, or metabolic disorders. Pathophysiologically, liver cells release enzymes into the bloodstream when damaged or inflamed, leading to elevated levels. Clinically, patients may present asymptomatically or with signs of liver disease, necessitating further investigation through imaging or liver biopsy to determine the underlying cause. This diagnosis code is typically used in gastroenterology settings for patients undergoing evaluation for liver-related issues.

Key Clinical Considerations:

  • Diagnosis requires elevated liver enzymes (ALT, AST) confirmed by laboratory tests.
  • Signs may include jaundice, abdominal pain, and fatigue; symptoms can vary widely.
  • Resolution is indicated by normalization of liver enzyme levels after treatment.
  • Imaging studies (ultrasound, CT) may show liver abnormalities; liver biopsy may be indicated for definitive diagnosis.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Documentation must include specific liver enzyme levels, patient symptoms, and any relevant history.
  • Compliant documentation: 'Patient's ALT level is 150 U/L, with symptoms of fatigue and jaundice.' Non-compliant: 'Patient has liver issues.'
  • Template phrases: 'Patient diagnosed with abnormal liver enzymes based on lab results.'
  • Medical necessity must be established through documented symptoms and rationale for testing.

Coding Guidelines

Usage Guidelines & Examples

  • Use R74.01 for isolated abnormal liver enzyme tests; for comprehensive liver disease, consider K76.9.
  • Do not use this code for unrelated liver conditions like cirrhosis or liver tumors.
  • Correct usage: 'Patient presents with elevated ALT and AST, coded as R74.01.' Incorrect: 'Patient has liver disease, coded as R74.01.'
  • Common errors include misclassifying the cause of enzyme elevation; ensure accurate diagnosis.

Code Exclusions

Important Exclusions

  • Excludes conditions like acute liver failure and chronic liver disease, which require different coding.
  • Alternative codes for exclusions include K72 (Hepatic failure) and K74 (Fibrosis and cirrhosis).
  • Common exclusion errors involve misidentifying the primary condition; ensure clarity in documentation.
  • Certain conditions are excluded due to different underlying pathophysiology, necessitating distinct codes.

Related ICD-10 Codes

Primary Codes
R74.01
Elevated liver enzyme levels, ALT
R94.5
Abnormal results of liver function studies
Ancillary Codes
R10.11
Differential Codes
K70.30
K70.30
when alcoholic cirrhosis is confirmed as the cause of elevated enzymes.
R74.8
R74.8
for isolated ALP or GGT elevations.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Gastroenterology

Specialty Applications

  • Applies to patients with suspected liver dysfunction or routine screening.
  • Appropriate in outpatient settings for monitoring chronic liver conditions.
  • Inpatient settings may require additional codes for complications or acute liver failure.
  • Gastroenterology specialists should be aware of specific liver enzyme thresholds for diagnosis.

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 enzymes diagnosed based on lab findings of ALT 150 U/L.'

Template 2

Template: 'Patient presents with fatigue and jaundice consistent with liver dysfunction.'

Template 3

Template: 'Diagnostic criteria met: Elevated ALT and AST levels confirmed.'

Template 4

Template: 'Treatment plan includes lifestyle modifications and follow-up 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?

Document specific liver enzyme levels, patient symptoms, and relevant history.

When should this code be used vs similar codes?

Use R74.01 for isolated enzyme elevation; use K76.9 for broader liver disease.

What are common billing issues with this code?

Ensure medical necessity is documented to avoid claim denials.

What procedures are commonly associated?

CPT codes for liver function tests and imaging studies may be relevant.