ICD-10 Guide

Acetaminophen Toxicity

ICD-10 Coding for Acetaminophen Toxicity(T39.1X1A, K71.10)

PRIMARY SPECIALTYEmergency Medicine

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Acetaminophen Toxicity?

Acetaminophen toxicity, also known as acetaminophen overdose, occurs when an individual ingests a dose of acetaminophen that exceeds the recommended therapeutic levels, leading to potential liver damage. Key clinical points include: 1) Acetaminophen is a common over-the-counter analgesic and antipyretic; 2) Toxicity can occur after a single large dose or chronic ingestion of high doses; 3) Early symptoms may be nonspecific, including nausea, vomiting, and abdominal pain; 4) Severe liver injury can develop within 24-72 hours post-ingestion; 5) Treatment often involves the administration of N-acetylcysteine (NAC) as an antidote. The etiology of acetaminophen toxicity primarily involves the saturation of the liver's glucuronidation and sulfation pathways, leading to the accumulation of a toxic metabolite, N-acetyl-p-benzoquinone imine (NAPQI). Clinical presentation may vary, but patients often report gastrointestinal symptoms initially, progressing to hepatic dysfunction if not treated promptly.

Key Clinical Considerations:

Diagnosis is confirmed through a history of acetaminophen ingestion, with consideration of the amount and timing of ingestion.
Signs and symptoms include nausea, vomiting, abdominal pain, jaundice, and altered mental status.
Resolution criteria include normalization of liver function tests and absence of symptoms after treatment.
Laboratory findings may show elevated liver enzymes (AST, ALT), prolonged prothrombin time, and metabolic acidosis.

Clinical Information

Clinical Criteria & Documentation Requirements

Documentation must include a detailed account of the patient's history, including the amount and timing of acetaminophen ingestion.
Compliant documentation: 'Patient presented with nausea and abdominal pain after ingesting 10 grams of acetaminophen.' Non-compliant: 'Patient has pain.'
Template phrases: 'Patient diagnosed with acetaminophen toxicity based on elevated liver enzymes and history of overdose.'
Medical necessity documentation should justify the need for treatment interventions such as NAC administration.

Coding Guidelines

Usage Guidelines & Examples

Use T39.1X1A for acute acetaminophen toxicity when there is a clear history of overdose. Example: A patient presents to the ER after taking 15 grams of acetaminophen.
Do NOT use this code if the patient has a history of chronic liver disease unrelated to acetaminophen.
Correct usage: T39.1X1A for acute overdose; Incorrect: K71.10 for liver disease without overdose.
Common errors include coding acetaminophen toxicity without confirming the dose or timing of ingestion.

Code Exclusions

Important Exclusions

Excluded conditions include chronic liver disease unrelated to acetaminophen, as they require different management.
Alternative codes for exclusions may include K70.30 (Alcoholic cirrhosis) for patients with liver disease.
Common exclusion errors include misclassifying chronic liver disease as acetaminophen toxicity.
Certain conditions are excluded to ensure accurate coding and appropriate treatment pathways.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

This diagnosis applies to patients presenting with acute acetaminophen overdose in emergency settings.
Clinical scenarios include accidental overdose in children or intentional overdose in adults.
Applicable in both inpatient and outpatient settings, particularly in emergency medicine.
Specialty-specific considerations include the need for rapid assessment and treatment in emergency departments.

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: 'Acetaminophen toxicity diagnosed based on elevated liver enzymes and history of overdose.'

Template 2

Template: 'Patient presents with nausea and vomiting consistent with acetaminophen toxicity.'

Template 3

Template: 'Diagnostic criteria met: elevated AST and ALT levels following acetaminophen ingestion.'

Template 4

Template: 'Treatment plan includes administration of NAC for acetaminophen toxicity.'

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 acetaminophen ingestion history, symptoms, and lab results is required.

When should this code be used vs similar codes?

Use T39.1X1A for acute toxicity; use K71.10 for liver disease without overdose.

What are common billing issues with this code?

Reimbursement may be denied if documentation does not clearly indicate overdose or treatment necessity.

What procedures are commonly associated?

CPT codes for NAC administration and liver function tests are commonly associated with this diagnosis.

What is Acetaminophen Toxicity?

Key Clinical Considerations:

Diagnosis is confirmed through a history of acetaminophen ingestion, with consideration of the amount and timing of ingestion.
Signs and symptoms include nausea, vomiting, abdominal pain, jaundice, and altered mental status.
Resolution criteria include normalization of liver function tests and absence of symptoms after treatment.
Laboratory findings may show elevated liver enzymes (AST, ALT), prolonged prothrombin time, and metabolic acidosis.

Acetaminophen Toxicity

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?

Acetaminophen Toxicity

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?