Z91.0111Allergy to milk products with tolerance to baked milk

Z91.0111 is the ICD-10-CM diagnosis code for allergy to milk products with tolerance to baked milk. It belongs to category Z91 (personal risk factors, not elsewhere classified), block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z91.011 (allergy to milk products), Z91.0111 is specifically for allergy to milk products with tolerance to baked milk. Related codes cover unspecified (Z91.0110) and with reactivity to baked milk (Z91.0112).

Don't report Z91.0111 together with the conditions in its Excludes1 note: Allergy to milk products with reactivity to baked milk (Z91.0112).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2026, effective October 1, 2025.