Z91.0121 Allergy to eggs with tolerance to baked egg
Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.
Excludes1 (never code together)
Allergy to eggs with reactivity to baked egg (Z91.0122)
Applies 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-)
Applies from Z91.0 Allergy status, other than to drugs and biological substances
Excludes2 (not included here)
Allergy status to drugs, medicaments, and biological substances (Z88.-)
Applies from Z91.01 Food allergy status
Excludes2 (not included here)
food additives allergy status (Z91.02)
MS-DRG index
Defines the logic of DRG(s) 951 in MDC 23.
Medicare Code Edits (MCE v43.1 (April 2026))
Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.
Code annotations containing back-references to Z91.0121
Back-references to Z91.0121
Type 1 Excludes: Z91.0122 Allergy to eggs with reactivity to baked egg ("Allergy to egg with tolerance to baked egg (Z91.0121)")
Back-references to Z91.01
Use Additional: K52.2 Allergic and dietetic gastroenteritis and colitis ("code to identify type of food allergy (Z91.01-, Z91.02-)")
Back-references to Z91.0
Use Additional: D89.44 Hereditary alpha tryptasemia ("allergy status, other than to drugs and biological substances (Z91.0-)")
Code Also: Z87.892 Personal history of anaphylaxis ("allergy status, other than to drugs and biological substances (Z91.0-)")
Type 2 Excludes: Z88 Allergy status to drugs, medicaments and biological substances ("Allergy status, other than to drugs and biological substances (Z91.0-)")
Diagnosis Index entries for Z91.0121
Allergy, allergic (reaction) (to) › food (any) (ingested) NEC › status (without reaction) › eggs › with › tolerance to baked egg
History › personal (of) › allergy (to) › food › eggs › with › tolerance to baked egg