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ICD-10 Guide
DiagnosesAlpha Gallon

Alpha Gallon

ICD-10 Coding for Alpha-gal Syndrome(Z91.014)

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

Diagnosis Overview

What is Alpha Gallon?
Essential facts and insights about Alpha-gal Syndrome

Key Clinical Considerations:

  • History of tick bites, particularly from the Lone Star tick (Amblyomma americanum)
  • Symptoms such as urticaria, angioedema, gastrointestinal distress, or anaphylaxis after consuming mammalian meat or products
  • Positive serum IgE antibodies to galactose-alpha-1,3-galactose (alpha-gal)
  • Physical examination may reveal urticaria or angioedema during an allergic reaction
  • Severity can range from mild allergic reactions to severe anaphylaxis, requiring immediate medical intervention

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of tick exposure and symptoms following mammalian meat consumption
  • Use specific terminology such as 'alpha-gal syndrome' and 'IgE-mediated allergy'
  • Examples include: 'Patient presents with urticaria after eating beef, with positive alpha-gal IgE test'
  • Medical necessity must be established through documentation of symptoms and diagnostic testing
  • Quality measures may include tracking the incidence of allergic reactions and patient education on avoidance

Coding Guidelines

Usage Guidelines & Examples

  • Use Z91.014 when a patient has a confirmed diagnosis of alpha-gal syndrome with documented symptoms
  • Do not use this code for non-IgE mediated food allergies or other types of meat allergies without alpha-gal involvement
  • Compare with codes like T78.0 (allergy, unspecified) for broader allergic reactions not related to alpha-gal
  • Common errors include misclassifying alpha-gal syndrome as a general food allergy; ensure specificity
  • In complex cases, consider additional codes for co-existing conditions like anaphylaxis (T78.2) or urticaria (L50.9)

Code Exclusions

Important Exclusions

  • Excludes non-IgE mediated food allergies and other specific food allergies not related to alpha-gal
  • Alternative codes for excluded conditions may include Z91.01 for general food allergies
  • Conditions are excluded due to the specific immunological mechanism involved in alpha-gal syndrome
  • Common mistakes include misdiagnosing alpha-gal syndrome as a general meat allergy; ensure proper testing
  • Related but distinct conditions include other tick-borne diseases and different food allergies

Related ICD-10 Codes

Primary Codes
Z91.014
History of allergy to mammalian meat due to alpha-gal syndrome
T78.2
Anaphylactic reaction due to food, unspecified
Ancillary Codes
T78.1XXA
W57.XXXA
Differential Codes
Z91.018

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 confirmed alpha-gal syndrome, particularly those with a history of tick bites
  • Patient populations include adults and children with a history of mammalian meat consumption and tick exposure
  • Clinical settings include outpatient allergy clinics, emergency departments, and inpatient care for severe reactions
  • Specialty-specific applications are relevant in allergy and immunology practices
  • Treatment contexts include dietary counseling and emergency 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 alpha-gal syndrome based on history of tick exposure and positive IgE test.'

Template 2

Template: 'Clinical presentation consistent with alpha-gal syndrome including urticaria after beef consumption.'

Template 3

Template: 'Diagnostic criteria for alpha-gal syndrome met as evidenced by positive IgE to galactose-alpha-1,3-galactose.'

Template 4

Template: 'Treatment plan initiated for alpha-gal syndrome with dietary modifications and emergency action plan.'

Template 5

Template: 'Follow-up care for alpha-gal syndrome including monitoring for allergic reactions and patient education.'

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 patient history of tick exposure, symptoms post-meat consumption, and positive IgE test results.

How does this differ from similar diagnoses?

Alpha-gal syndrome is specifically IgE-mediated and linked to tick bites, unlike other food allergies.

What are common billing considerations?

Ensure documentation supports medical necessity and includes specific symptoms and test results for reimbursement.

What procedures are typically associated?

CPT codes for allergy testing (e.g., 86003 for specific IgE testing) and management of allergic reactions.

Are there any quality reporting implications?

Quality measures may include tracking allergic reactions and patient education on avoidance strategies.