All ICD10 Codes

Z91.011

Non-Billable
ChapterZ00–Z99
Ranksubcategory
Official Description

Allergy to milk products

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 21: Factors Influencing Health Status and Contact with Health Services (Z00-Z99).

Instructional Notes

Excludes1(Not coded here)
  • lactose intolerance (E73.-)
General instructions are available for the parent sections:
View Z77-Z99 NotesView Z91 NotesView Z91.0 NotesView Z91.01 Notes

Clinical Hierarchy

CH21Factors influencing health status and contact with health services (Z00-Z99)
Z77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
Z91Personal risk factors, not elsewhere classified
Z91.0Allergy status, other than to drugs and biological substances
Z91.01Food allergy status
Z91.011Allergy to milk products
Z91.0110Allergy to milk products, unspecified
Z91.0111Allergy to milk products with tolerance to baked milk
Z91.0112Allergy to milk products with reactivity to baked milk

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Z91.011:

subcategoryZ91.01
Food allergy status
View context instructions
subcategoryZ91.0
Allergy status, other than to drugs and biological substances
View context instructions
categoryZ91
Personal risk factors, not elsewhere classified
View context instructions
blockZ77-Z99
Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to Z91.011. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

9 raw paths
Allergy, allergic (reaction) (to)6 unique routes
food (any) (ingested) NEC(3 variants)
status (without reaction)(3 variants)
milk products→Z91.011(3 variants)
with(2 variants)
reactivity to baked milk→Z91.011
tolerance to baked milk→Z91.011
milk protein→Z91.011(3 variants)
with(2 variants)
reactivity to baked milk→Z91.011
tolerance to baked milk→Z91.011
History3 unique routes
personal (of)(3 variants)
allergy (to)(3 variants)
food(3 variants)
milk products→Z91.011(3 variants)
with(2 variants)
reactivity to baked milk→Z91.011
tolerance to baked milk→Z91.011

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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