2026 ICD-10-CM Diagnosis Code Z91.018Allergy to other foods

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z91

ICD-10-CM Z91.018
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z91.018 is a billable ICD-10-CM diagnosis code for allergy to other foods. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z91.018
Billable Status
Yes — Valid for Submission
Code Describes
Allergy to other foods
Short Description
Allergy to other foods
Same as the full description in the CMS dataset.
Parent Code
Z91.012
Allergy to eggs

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
CategoryZ91Personal risk factors, not elsewhere classified
This CodeZ91.018Allergy to other foods

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z91.018.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z91.018 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergy to almond
  • Allergy to almond oil
  • Allergy to apple
  • Allergy to Arachis oil
  • Allergy to banana
  • Allergy to barley
  • Allergy to bean
  • Allergy to caffeine
  • Allergy to carrot
  • Allergy to cashew nut
  • Allergy to celery
  • Allergy to cherry
  • Allergy to chicken meat
  • Allergy to chocolate
  • Allergy to cinnamon
  • Allergy to citrus fruit
  • Allergy to coconut oil
  • Allergy to corn
  • Allergy to dietary mushroom
  • Allergy to fenugreek
  • Allergy to food additive
  • Allergy to fruit
  • Allergy to gelatin
  • Allergy to gluten
  • Allergy to hazelnut
  • Allergy to kiwi fruit
  • Allergy to lupine seed
  • Allergy to macadamia nut
  • Allergy to mango fruit
  • Allergy to meat
  • Allergy to mustard seasoning
  • Allergy to nut
  • Allergy to oat
  • Allergy to olive oil
  • Allergy to pea
  • Allergy to phosphodiesterase inhibitor
  • Allergy to pineapple
  • Allergy to poppy seed
  • Allergy to potato
  • Allergy to pulse vegetable
  • Allergy to rye
  • Allergy to seed
  • Allergy to soy protein
  • Allergy to strawberry
  • Allergy to tomato
  • Allergy to tree nut
  • Allergy to vegetable
  • Allergy to walnut
  • Allergy to watermelon
  • Allergy to wheat
  • Gastrointestinal hypersensitivity caused by food
  • History of food allergy
  • History of food hypersensitivity
  • Pollen-food allergy
  • Propensity to adverse reactions to food

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Allergy to nuts other than peanuts

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Allergy, allergic(reaction) (to)
      • food (any) (ingested) NEC
        • status (without reaction)
    • Allergy, allergic(reaction) (to)
      • food (any) (ingested) NEC
        • status (without reaction)
          • specified NEC
    • History
      • personal (of)
        • allergy (to)
          • food
    • History
      • personal (of)
        • allergy (to)
          • food
            • specified food NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Food Allergy

A food allergy is an abnormal immune system reaction to certain foods. Your immune system normally protects you from germs. But if you have a food allergy, your immune system mistakenly reacts to certain foods as if they were harmful. This reaction is usually mild. But in some cases, it can be serious or even life-threatening.

The full article covers:

  • What is a food allergy?
  • Who is more likely to develop a food allergy?
  • What are the symptoms of food allergies?
  • How are food allergies diagnosed?
  • What are the treatments for food allergies?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z91.018 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V15.05 Hx-other food allergy
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z91.018Overview

Is Z91.018 (Allergy to eggs) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report allergy to other foods on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z91.018 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because allergy to other foods describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z91.018 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for allergy to other foods on inpatient claims.

What is the ICD-9 equivalent of Z91.018?

Under the General Equivalence Mappings, allergy to other foods converts to ICD-9-CM V15.05 (hx-other food allergy). The mapping is approximate, so confirm the match fits the documentation.