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Z91.0121

Z91.0121: Allergy to eggs with tolerance to baked egg

Billable / specific codeICD-10-CMPOA exempt

Z91.0121 is a billable, specific ICD-10-CM code for allergy to eggs with tolerance to baked egg. It is valid for submission on a claim.

Check Z91.0121 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • Allergy to eggs with reactivity to baked egg (Z91.0122)

Excludes2 inherited from the categories above Z91.0121

Not part of this code, but both may be coded when both are present.

Written on Z91.01: Food allergy status

  • food additives allergy status (Z91.02)

Written on Z91.0: Allergy status, other than to drugs and biological substances

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

Written on Z91: Personal risk factors, not elsewhere classified

  • contact with and (suspected) exposures hazardous to health (Z77.-)
  • exposure to pollution and other problems related to physical environment (Z77.1-)
  • female genital mutilation status (N90.81-)
  • occupational exposure to risk factors (Z57.-)
  • personal history of physical injury and trauma (Z87.81, Z87.82-)

Other codes that can never be billed with Z91.0121

Their own Excludes1 notes name this code, so the conflict is not listed above.

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

Z91.0121 is named in 13 Medicare coverage policies: 13 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56558Billing and Coding: Allergy Testing
  • A57043Billing and Coding: RAST Type Tests
  • A57531Billing and Coding: Allergy Testing
  • A60360Billing and Coding: Allergy Diagnostic Testing

Alphabetic index entries that lead here

  • Allergy, allergic›food NEC›status›eggs›with›tolerance to baked egg
  • History›personal›allergy›food›eggs›with›tolerance to baked egg

Code history

  • addedFY2024-FY2027

    Allergy to eggs with tolerance to baked egg

Other codes under Z91.012

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.