ICD-10-CM › Z00-Z99 › Z77-Z99 › Z91.012 Allergy to eggs › Z91.0120

Valid for claims with a date of service in the current code year.

Valid FY2026 onwards.

What has happened to this code

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from Z91 Personal risk factors, not elsewhere classified

Excludes2 - not included here

• 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-)

Inherited from the Z77-Z99 section Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Code also

• any follow-up examination (Z08-Z09)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

• History > personal
• Disorder > allergic
• Hypersusceptibility
• Reaction > allergic
• Sensitive, sensitivity
• Allergy, allergic > wheat
• History > personal > cancer
• Allergy, allergic > milk protein
• Effect, adverse > foodstuffs > allergic reaction
• History > personal > malignant neoplasm > carcinoid
• Hypersensitive, hypersensitiveness, hypersensitivity
• History > personal > allergy > food > eggs
• Allergy, allergic > food NEC > status > eggs

Codes in the same group

Code	Description	Status
Z91.0121	Allergy to eggs with tolerance to baked egg	Valid
Z91.0122	Allergy to eggs with reactivity to baked egg	Valid