2026 ICD-10-CM Diagnosis Code Z91.013Allergy to seafood

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z91

ICD-10-CM Z91.013
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z91.013 is a billable ICD-10-CM diagnosis code for allergy to seafood. 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
Z91.013
Billable Status
Yes — Valid for Submission
Code Describes
Allergy to seafood
Short Description
Allergy to seafood
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 CodeZ91.013Allergy to seafood

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z91.013.

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

Z91.013 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 calcitonin
  • Allergy to calcium regulating hormone
  • Allergy to clam
  • Allergy to fish
  • Allergy to fish derived omega 3 fatty acid
  • Allergy to fish oil
  • Allergy to lobster
  • Allergy to mollusk
  • Allergy to mussel
  • Allergy to oyster
  • Allergy to salmon calcitonin
  • Allergy to seafood
  • Allergy to shellfish
  • Allergy to shrimp

Tabular List NotesGuidance

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

Inclusion Terms

  • Allergy to shellfish
  • Allergy to octopus or squid ink

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)
          • seafood
    • History
      • personal (of)
        • allergy (to)
          • food
            • seafood

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 Z91.013 to ICD-9-CMHistory

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

ICD-9-CM
V15.04 Hx-seafood allergy
Exact Match The mapping is direct, with no qualifiers.

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 Z91.013Overview

Is Z91.013 (Allergy to eggs) a billable code?

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

Can Z91.013 be a principal diagnosis?

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

Is Z91.013 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 seafood on inpatient claims.

What is the ICD-9 equivalent of Z91.013?

Under the General Equivalence Mappings, allergy to seafood converts to ICD-9-CM V15.04 (hx-seafood allergy). The mapping is a direct match.