Non-Billable / Non-Specific Code
ICD-10-CM Z91.011 is the diagnosis code for Allergy to milk products. 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 non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. 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 Z91.011. They are mutually exclusive:
Understanding where Z91.011 sits in the ICD-10-CM classification helps ensure proper coding:
No, Z91.011 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
Z91.011 is the ICD-10-CM diagnosis code for "Allergy to milk products". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Z91.011 is Z91.01 ("Food allergy status"). Z91.011 provides a more specific classification within this category.
Z91.011 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.
Z91.011 has 3 sub-code(s) that provide more specific detail: Z91.0110, Z91.0111, Z91.0112.
Use Z91.011 when the patients documented diagnosis matches "Allergy to milk products" 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 milk products is Z91.011.
No, Z91.011 is non-billable. Use a more specific sub-code for primary diagnosis billing.
Z91.011 is in Chapter 21 of the ICD-10-CM Tabular List.
Type 1 Excludes for Z91.011 include: lactose intolerance (E73.-).
Yes, Z91.011 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.