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ICD-10/Z91.011

Z91.011 ICD-10-CM Code: Allergy to milk products

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Allergy to milk products is a non-billable ICD-10-CM category code (Z91.011). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Z91.011 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • lactose intolerance (E73.-)

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • food additives allergy status (Z91.02)
  • Allergy status to drugs, medicaments, and biological substances (Z88.-)
  • 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-)

Code Also

Additional codes that may be required to fully describe the encounter.

  • any follow-up examination (Z08-Z09)

Frequently Asked Questions (FAQ) & Clinical Guidance

Can Z91.011 be billed directly?

No. Z91.011 (Allergy to milk products) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z91.011 in its code family, with their registry titles.

  • Z91 — Personal risk factors, not elsewhere classified
  • Z91.0 — Allergy status, other than to drugs and biological substances
  • Z91.01 — Food allergy status
  • Z91.010 — Allergy to peanuts
  • Z91.0110 — Allergy to milk products, unspecified
  • Z91.0111 — Allergy to milk products with tolerance to baked milk
  • Z91.0112 — Allergy to milk products with reactivity to baked milk
  • Z91.012 — Allergy to eggs
  • Z91.0120 — Allergy to eggs, unspecified
  • Z91.0121 — Allergy to eggs with tolerance to baked egg

View all codes in the Z91 family