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v1.0.0
ICD-10 Guide
DiagnosesFood Allergies

Food Allergies

ICD-10 Coding for Food Allergies(Z91.010, T78.0)

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

Diagnosis Overview

What is Food Allergies?
Essential facts and insights about Food Allergies

Key Clinical Considerations:

  • Common symptoms include hives, swelling, gastrointestinal distress, and anaphylaxis.
  • Skin prick tests, serum-specific IgE tests, and oral food challenges.
  • Physical exam may reveal urticaria, angioedema, or respiratory distress.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document patient history of allergic reactions, specific foods involved, and test results.
  • Use terminology such as 'IgE-mediated food allergy' and 'anaphylaxis'.
  • Examples include detailed descriptions of reactions and any previous interventions.

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding food allergies; avoid using unspecified codes when possible.
  • Common errors include misclassifying food allergies as intolerances.

Code Exclusions

Important Exclusions

  • Non-IgE mediated food allergies, food intolerances, and other allergic conditions.
  • Alternative codes for related conditions such as asthma or eczema.

Related ICD-10 Codes

Primary Codes
Z91.01
Food allergy status
T78.0
Allergy, unspecified
T78.1
Allergy, food
Differential Codes
T78.0
T78.0
for active anaphylactic reactions, not
Z91.010
.
Z91.010
Z91.010
for known allergy status without active reaction.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Allergy and Immunology

Specialty Applications

  • Pediatric and adult populations with suspected food allergies.
  • Outpatient allergy clinics and 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

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

Documentation requirements?

Include detailed patient history, symptoms, and test results.

Billing considerations?

Ensure correct coding to avoid denials; consider modifiers for specific services.