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ICD-10 Guide
DiagnosesAllergy To Amoxicillin

Allergy To Amoxicillin

ICD-10 Coding for Allergy to Amoxicillin(T36.0X5A, Z88.0)

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

Diagnosis Overview

What is Allergy To Amoxicillin?
Essential facts and insights about Allergy to Amoxicillin

Key Clinical Considerations:

  • History of hypersensitivity reactions to amoxicillin, including urticaria, angioedema, or anaphylaxis.
  • Skin testing may show positive results for amoxicillin-specific IgE antibodies.
  • Physical examination may reveal rash, swelling, or respiratory distress during or after amoxicillin administration.
  • No imaging or procedural findings are typically applicable for this diagnosis.
  • Severity can range from mild allergic reactions (e.g., rash) to severe reactions (e.g., anaphylaxis).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of allergic reactions to amoxicillin, including specific symptoms experienced.
  • Use precise terminology such as 'amoxicillin allergy' or 'hypersensitivity to amoxicillin'.
  • Examples include: 'Patient reports rash and swelling after taking amoxicillin' or 'Skin test positive for amoxicillin allergy'.
  • Medical necessity documentation should include the rationale for avoiding amoxicillin in treatment plans.
  • Quality measures may require documentation of allergy status in medication reconciliation processes.

Coding Guidelines

Usage Guidelines & Examples

  • Use T36.0X5A for initial encounters of allergy to amoxicillin with specific symptoms documented.
  • Do not use this code for non-allergic adverse reactions to amoxicillin, such as gastrointestinal upset.
  • Compare with Z88.0, which indicates a history of allergy but does not specify the current status.
  • Common errors include using the allergy code when the patient has a history but no current symptoms.
  • In complex cases, ensure to document the severity and type of allergic reaction for accurate code selection.

Code Exclusions

Important Exclusions

  • Exclude codes for non-allergic adverse effects such as nausea or diarrhea.
  • Alternative codes for excluded conditions may include T36.0X5 for adverse effects without allergy.
  • Conditions are excluded because they do not represent true allergic reactions.
  • Common mistakes include misclassifying adverse effects as allergies.
  • Related but distinct conditions include intolerance to amoxicillin without an immune-mediated response.

Related ICD-10 Codes

Primary Codes
T36.0X5A
Allergy to amoxicillin, initial encounter
Z88.0
Allergy status to penicillin
Ancillary Codes
L23.0
T36.0X5
A when contact dermatitis is present.
Differential Codes
Z88.0
Z88.0
for historical allergy status without current adverse effects.
T36.0X5A
T36.0X5
A for current adverse reactions.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Allergy and Immunology

Specialty Applications

  • Applies to patients with documented hypersensitivity to amoxicillin.
  • Patient populations include all ages, with increased risk in those with a history of allergies.
  • Clinical settings include outpatient allergy clinics, emergency departments, and inpatient care.
  • Specialty-specific applications are relevant in allergy and immunology practices.
  • Treatment contexts include avoidance of amoxicillin in antibiotic therapy.

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: 'Patient diagnosed with allergy to amoxicillin based on reported symptoms and testing results.'

Template 2

Template: 'Clinical presentation consistent with amoxicillin allergy including urticaria and respiratory distress.'

Template 3

Template: 'Diagnostic criteria for allergy met as evidenced by positive skin test for amoxicillin.'

Template 4

Template: 'Treatment plan initiated for allergy to amoxicillin with avoidance strategies discussed.'

Template 5

Template: 'Follow-up care for amoxicillin allergy including monitoring for alternative antibiotic reactions.'

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 diagnosis?

Document the patient's allergic reaction history, including symptoms and severity.

How does this differ from similar diagnoses?

Allergy to amoxicillin is an IgE-mediated response, while intolerance is not.

What are common billing considerations?

Ensure accurate coding to reflect the allergy status for reimbursement.

What procedures are typically associated?

Related CPT codes may include allergy testing and consultation services.

Are there any quality reporting implications?

Quality measures may require documentation of allergy status in electronic health records.