2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Toxic effect of noxious substances eaten as seafood
Same as the full description in the CMS dataset.
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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T61: its own notes plus those printed at block T51-T65 and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On T61 itself
  • 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-)
From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • contact with and (suspected) exposure to toxic substances (Z77.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • code(s):
  • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
  • personal history of foreign body fully removed (Z87.821)
  • to identify any retained foreign body, if applicable (Z18.-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Block T51-T65 Toxic effects of substances chiefly nonmedicinal as to source applies to 1,680 codes
  • When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category T61
Values for category T61 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T61, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming T61: its condition is not part of those codes, and both may be reported when the patient has both.

  • T63 Toxic effect of contact with venomous animals and plants
    ingestion of toxic animal or plant (T61.-, T62.-)
  • T63.5 Toxic effect of contact with venomous fish
    poisoning by ingestion of fish (T61.-)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T61Overview

What is the ICD-10 code for toxic effect of noxious substances eaten as seafood?

T61 is the ICD-10-CM category for toxic effect of noxious substances eaten as seafood, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can T61 be reported with a code from T78.0?

Not as a rule. The Excludes1 note on T61 lists "anaphylactic reaction or shock due to adverse food reaction (T78.0-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).