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Z91.0122: Allergy to eggs with reactivity to baked egg

ICD-10-CM code Z91.0122

New code ยท FY2026

Billable: use this code on claims.

  • New code, effective October 1, 2025 (FY2026).

Code breakdown

Z91.0122

  1. Z91CategoryPersonal risk factors, not elsewhere classified
  2. 0Character 4Allergy status, other than to drugs and biological substances
  3. 1Character 5Food allergy status
  4. 2Character 6Allergy to eggs
  5. 2Character 7Allergy to eggs with reactivity to baked egg

Coding notes

Excludes1

  • Allergy to egg with tolerance to baked egg (Z91.0121)

Excludes2 (from Z91.01)

  • food additives allergy status (Z91.02)

Excludes2 (from Z91.0)

  • Allergy status to drugs, medicaments, and biological substances (Z88.-)

Medicare coverage

Z91.0122 is listed as a covered diagnosis in 8 Medicare billing and coding articles:

  • A56558 Billing and Coding: Allergy Testing
  • A57043 Billing and Coding: RAST Type Tests
  • A57531 Billing and Coding: Allergy Testing
  • A60361 Billing and Coding: Allergy Diagnostic Testing
  • A60364 Billing and Coding: Allergy Diagnostic Testing
  • A60375 Billing and Coding: Allergy Diagnostic Testing
  • A60377 Billing and Coding: Allergy Diagnostic Testing
  • A60391 Billing and Coding: Allergy Diagnostic Testing

Check this code

All FY2026 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.