DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T61 Toxic effect of noxious substances eaten as seafood

  • Header · not billable
  • Codes take a 7th character

T61 is not billable. The category heads 72 billable codes in FY2027, grouped under 5 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Poisoning (acute)ciguatera fish → T61.0-
  • Poisoning (acute)fish (noxious) → T61.9-
  • Poisoning (acute)scombroid fish → T61.1-

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T51-T65 Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
  3. T61 Toxic effect of noxious substances eaten as seafood
Billable codes
72
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
6
New FY2027
0
Index entries
7

Codes in T61

  1. T61.0
    Ciguatera fish poisoning
    Header
  2. T61.01
    Ciguatera fish poisoning, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  3. T61.02
    Ciguatera fish poisoning, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  4. T61.03
    Ciguatera fish poisoning, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  5. T61.04
    Ciguatera fish poisoning, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T61.1
    Scombroid fish poisoning
    Header
    Inclusion terms 1

    Inclusion terms

    • Histamine-like syndrome
  7. T61.11
    Scombroid fish poisoning, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. T61.12
    Scombroid fish poisoning, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  9. T61.13
    Scombroid fish poisoning, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  10. T61.14
    Scombroid fish poisoning, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  11. T61.7
    Other fish and shellfish poisoning
    Header
  12. T61.77
    Other fish poisoning
    Header
  13. T61.771
    Other fish poisoning, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  14. T61.772
    Other fish poisoning, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  15. T61.773
    Other fish poisoning, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. T61.774
    Other fish poisoning, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. T61.78
    Other shellfish poisoning
    Header
  18. T61.781
    Other shellfish poisoning, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  19. T61.782
    Other shellfish poisoning, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  20. T61.783
    Other shellfish poisoning, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  21. T61.784
    Other shellfish poisoning, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  22. T61.8
    Toxic effect of other seafood
    Header
  23. T61.8X
    Toxic effect of other seafood
    Header
  24. T61.8X1
    Toxic effect of other seafood, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T61.8X2
    Toxic effect of other seafood, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  26. T61.8X3
    Toxic effect of other seafood, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  27. T61.8X4
    Toxic effect of other seafood, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  28. T61.9
    Toxic effect of unspecified seafood
    Header
  29. T61.91
    Toxic effect of unspecified seafood, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  30. T61.92
    Toxic effect of unspecified seafood, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  31. T61.93
    Toxic effect of unspecified seafood, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  32. T61.94
    Toxic effect of unspecified seafood, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At T61

Excludes1

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

Notes that also apply

Block T51-T65 instructions (Notes 1, Excludes1 1, Use additional code 4): printed on the block page.

Chapter 19 instructions (Notes 2, Excludes2 2, Use additional code 1): printed on the chapter 19 page.

7th characters

7th characters for T61 defined here

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

7th characters for T61
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Index entries

  • Poisoning (acute)ciguatera fish → T61.0-
  • Poisoning (acute)scombroid fish → T61.1-
  • Poisoning (acute)shellfish (amnesic) (azaspiracid) (diarrheic) (neurotoxic) (noxious) (paralytic) → T61.78-
  • Poisoning (acute)fish (noxious) → T61.9-
  • Poisoning (acute)seafood (noxious) → T61.9-
  • Poisoning (acute)fish (noxious)specified type NEC → T61.77-
  • Poisoning (acute)seafood (noxious)specified NEC → T61.8X-

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy