2026 ICD-10-CM Diagnosis Code T61Toxic effect of noxious substances eaten as seafood

ICD-10-CM Codes›S00–T88›T51-T65›T61

ICD-10-CM T61
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T61 is a non-billable ICD-10-CM category code for toxic effect of noxious substances eaten as seafood, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T61.01XA, T61.01XD, T61.01XS, and T61.02XA.

Code Identity

ICD-10-CM Code
T61
Billable Status
No — Non-Billable Category
Code Describes
Toxic effect of noxious substances eaten as seafood
Chapter
T51-T65
Toxic effects of substances chiefly nonmedicinal as to source

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT51-T65Toxic effects of substances chiefly nonmedicinal as to source
CategoryT61Toxic effect of noxious substances eaten as seafood
This CodeT61Toxic effect of noxious substances eaten as seafood

Specific Coding for Toxic effect of noxious substances eaten as seafoodOverview

Non-specific codes like T61 require more characters. Use one of these billable codes instead:

  • T61.0 for Ciguatera fish poisoning

  • T61.01 for Ciguatera fish poisoning, accidental (unintentional)

  • T61.02 for Ciguatera fish poisoning, intentional self-harm

  • T61.03 for Ciguatera fish poisoning, assault

  • T61.04 for Ciguatera fish poisoning, undetermined

  • T61.1 for Scombroid fish poisoning

  • T61.11 for Scombroid fish poisoning, accidental (unintentional)

  • T61.12 for Scombroid fish poisoning, intentional self-harm

  • T61.13 for Scombroid fish poisoning, assault

  • T61.14 for Scombroid fish poisoning, undetermined

  • T61.7 for Other fish and shellfish poisoning

  • T61.77 for Other fish poisoning

  • T61.78 for Other shellfish poisoning

  • T61.8 for Toxic effect of other seafood

  • T61.8X for Toxic effect of other seafood

  • T61.9 for Toxic effect of unspecified seafood

  • T61.91 for Toxic effect of unspecified seafood, accidental (unintentional)

  • T61.92 for Toxic effect of unspecified seafood, intentional self-harm

  • T61.93 for Toxic effect of unspecified seafood, assault

  • T61.94 for Toxic effect of unspecified seafood, undetermined

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Toxic effect of noxious substances eaten as seafood (T61). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

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

Type 1 Excludes

  • allergic reaction to food, such as:
  • anaphylactic reaction or shock due to adverse food reaction T78.0
  • bacterial foodborne intoxications A05
  • dermatitis L23.6 L25.4 L27.2
  • food protein-induced enterocolitis syndrome K52.21
  • food protein-induced enteropathy K52.22
  • gastroenteritis noninfective K52.29
  • toxic effect of aflatoxin and other mycotoxins T64
  • toxic effect of cyanides T65.0
  • toxic effect of harmful algae bloom T65.82
  • toxic effect of hydrogen cyanide T57.3
  • toxic effect of mercury T56.1
  • toxic effect of red tide T65.82

7th Character Note

  • The appropriate 7th character is to be added to each code from category T61

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Foodborne Illness

Each year, around 48 million people in the United States get sick from contaminated food. Common causes include bacteria and viruses. Less often, the cause may be a parasite or a harmful chemical, such as a high amount of pesticides. Symptoms of foodborne illness depend on the cause. They can be mild or serious. They usually include:

Read the full article at MedlinePlus

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

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 T61Overview

Is T61 (Toxic effect of noxious substances eaten as seafood) a billable code?

No. This is a category header that groups the codes for toxic effect of noxious substances eaten as seafood, and headers cannot be submitted on claims. Claims for toxic effect of noxious substances eaten as seafood need a more specific code from this category, such as T61.01XA, T61.01XD, and T61.01XS.