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ICD-10 Guide
DiagnosesAmoxicillin Allergy

Amoxicillin Allergy

ICD-10 Coding for Amoxicillin Allergy(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 Amoxicillin Allergy?
Essential facts and insights about Amoxicillin Allergy

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 anaphylactic reactions requiring immediate medical intervention.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of allergic reactions to amoxicillin and any other penicillin derivatives.
  • Use specific terminology such as 'amoxicillin allergy' or 'hypersensitivity to amoxicillin' in the medical record.
  • Examples include: 'Patient reports a history of rash 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 patients with a documented allergy to amoxicillin presenting with symptoms.
  • Do not use this code for patients with non-allergic adverse reactions (e.g., gastrointestinal upset) to amoxicillin.
  • Related codes include Z88.0 for personal history of allergy to penicillin, which may be used in conjunction.
  • Common errors include using this code for non-allergic reactions; ensure clear documentation of allergy status.
  • In complex cases, consider additional codes for associated conditions (e.g., anaphylaxis) if applicable.

Code Exclusions

Important Exclusions

  • Excludes patients with non-allergic adverse reactions to amoxicillin, such as gastrointestinal symptoms.
  • Alternative codes for excluded conditions may include T78.0 for unspecified adverse effects.
  • Conditions are excluded to ensure accurate representation of true allergic reactions versus side effects.
  • Common mistakes include misclassifying non-allergic reactions as allergies; ensure clear documentation.
  • Related but distinct conditions include intolerance to amoxicillin versus true IgE-mediated allergy.

Related ICD-10 Codes

Primary Codes
T36.0X5A
Allergy to amoxicillin, initial encounter
Z88.0
Personal history of allergy to penicillin
Ancillary Codes
L50.0
Differential Codes
T88.6XXA
Z91.03

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 a documented allergy to amoxicillin, particularly in allergy and immunology settings.
  • Patient populations include all ages, with particular attention to those with a history of allergic reactions.
  • Clinical settings include outpatient allergy clinics, emergency departments, and inpatient care where antibiotics are prescribed.
  • Specialty-specific applications are relevant in allergy and immunology, as well as primary care.
  • Treatment contexts include antibiotic prescribing practices and management of allergic reactions.

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 amoxicillin allergy based on clinical findings of urticaria after administration.'

Template 2

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

Template 3

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

Template 4

Template: 'Treatment plan initiated for amoxicillin allergy with avoidance of all penicillin derivatives.'

Template 5

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

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 allergy history, specific symptoms, and any testing results.

How does this differ from similar diagnoses?

Amoxicillin allergy is an IgE-mediated response, while intolerance may not involve the immune system.

What are common billing considerations?

Ensure accurate coding to reflect the allergy status for appropriate reimbursement.

What procedures are typically associated?

Related CPT codes may include allergy testing and management protocols.

Are there any quality reporting implications?

Quality measures may require documentation of allergy status in patient records.