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ICD-10-CM 2027 diagnosis code

T61.78Other shellfish poisoning

Not billable — use a more specific codeRequires 7th character

T61.78 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T61.78

T61.78 is the ICD-10-CM diagnosis code for other shellfish poisoning. It belongs to category T61 (toxic effect of noxious substances eaten as seafood), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within T61.7 (other fish and shellfish poisoning), T61.78 is specifically for other shellfish poisoning. Related codes cover fish poisoning (T61.77).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

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

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Notes that apply from higher levels

Instructions written at a parent level also apply to T61.78.

› From T61 Toxic effect of noxious substances eaten as seafood
Excludes1
  • 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-)

Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to T61.78.

Codes whose notes reference T61.78

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T61.78

Is T61.78 billable?

No. T61.78 is a header code. Report one of its more specific subcodes instead.