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ICD-10-CM 2027 diagnosis code

Z91.012Allergy to eggs

Not billable — use a more specific code

Z91.012 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z91.012

Z91.012 is the ICD-10-CM diagnosis code for allergy to eggs. It belongs to category Z91 (personal risk factors, not elsewhere classified), block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within Z91.01 (food allergy status), Z91.012 is specifically for allergy to eggs. Related codes cover peanuts (Z91.010), milk products (Z91.011), seafood (Z91.013), mammalian meats (Z91.014) and other foods (Z91.018).

To report this condition, pick the subcode that matches the documentation: Z91.0120 (unspecified), Z91.0121 (with tolerance to baked egg) and Z91.0122 (with reactivity to baked egg).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2026 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as V15.03 (allergy to eggs).

Specific codes under Z91.012

Notes that apply from higher levels

Instructions written at a parent level also apply to Z91.012.

› From Z91.01 Food allergy status
Excludes2
  • food additives allergy status (Z91.02)
› From Z91.0 Allergy status, other than to drugs and biological substances
Excludes2
  • Allergy status to drugs, medicaments, and biological substances (Z88.-)
› From Z91 Personal risk factors, not elsewhere classified
Excludes2
  • 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-)

Broader instructions also apply from Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status and Chapter 21: Factors influencing health status and contact with health services.

ICD-9-CM equivalent

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From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2026 (effective 10/1/2025): Expanded — no longer billable

Common questions about Z91.012

Is Z91.012 billable?

No. Z91.012 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for Z91.012?

The CMS General Equivalence Mappings map Z91.012 to ICD-9-CM V15.03.