Billable / Specific Code
ICD-10-CM Z91.0121 is the diagnosis code for Allergy to eggs with tolerance to baked egg. This code falls under the section "Persons with potential health hazards related to family and personal history and certain conditions influencing health status" within Chapter 21 — Factors influencing health status and contact with health services (Z00-Z99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as Z91.0121. They are mutually exclusive:
Understanding where Z91.0121 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Z91.0121 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Z91.0121 is the ICD-10-CM diagnosis code for "Allergy to eggs with tolerance to baked egg". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Z91.0121 is Z91.012 ("Allergy to eggs"). Z91.0121 provides a more specific classification within this category.
Z91.0121 is located in Section Z77-Z99 — "Persons with potential health hazards related to family and personal history and certain conditions influencing health status" within Chapter 21 of the ICD-10-CM Tabular List.
Use Z91.0121 when the patients documented diagnosis matches "Allergy to eggs with tolerance to baked egg" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Allergy to eggs with tolerance to baked egg is Z91.0121.
Yes, Z91.0121 can be used as a primary diagnosis code since it is billable and specific.
Z91.0121 is in Chapter 21 of the ICD-10-CM Tabular List.
Type 1 Excludes for Z91.0121 include: Allergy to eggs with reactivity to baked egg (Z91.0122).
Yes, Z91.0121 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.