DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T54 Toxic effect of corrosive substances

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

T54 is not billable. The category heads 60 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

  • Necrosis, necrotic (ischemic)phosphorus → T54.2

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. T54 Toxic effect of corrosive substances
Billable codes
60
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
5
New FY2027
0
Index entries
1

Codes in T54

  1. T54.0
    Toxic effects of phenol and phenol homologues
    Header
  2. T54.0X
    Toxic effects of phenol and phenol homologues
    Header
  3. T54.0X1
    Toxic effect of phenol and phenol homologues, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Toxic effects of phenol and phenol homologues NOS
  4. T54.0X2
    Toxic effect of phenol and phenol homologues, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  5. T54.0X3
    Toxic effect of phenol and phenol homologues, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T54.0X4
    Toxic effect of phenol and phenol homologues, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. T54.1
    Toxic effects of other corrosive organic compounds
    Header
  8. T54.1X
    Toxic effects of other corrosive organic compounds
    Header
  9. T54.1X1
    Toxic effect of other corrosive organic compounds, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Toxic effects of other corrosive organic compounds NOS
  10. T54.1X2
    Toxic effect of other corrosive organic compounds, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  11. T54.1X3
    Toxic effect of other corrosive organic compounds, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  12. T54.1X4
    Toxic effect of other corrosive organic compounds, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  13. T54.2
    Toxic effects of corrosive acids and acid-like substances
    Header
    Inclusion terms 2

    Inclusion terms

    • Toxic effects of hydrochloric acid
    • Toxic effects of sulfuric acid
  14. T54.2X
    Toxic effects of corrosive acids and acid-like substances
    Header
  15. T54.2X1
    Toxic effect of corrosive acids and acid-like substances, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Toxic effects of corrosive acids and acid-like substances NOS
  16. T54.2X2
    Toxic effect of corrosive acids and acid-like substances, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  17. T54.2X3
    Toxic effect of corrosive acids and acid-like substances, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  18. T54.2X4
    Toxic effect of corrosive acids and acid-like substances, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  19. T54.3
    Toxic effects of corrosive alkalis and alkali-like substances
    Header
    Inclusion terms 2

    Inclusion terms

    • Toxic effects of potassium hydroxide
    • Toxic effects of sodium hydroxide
  20. T54.3X
    Toxic effects of corrosive alkalis and alkali-like substances
    Header
  21. T54.3X1
    Toxic effect of corrosive alkalis and alkali-like substances, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Toxic effects of corrosive alkalis and alkali-like substances NOS
  22. T54.3X2
    Toxic effect of corrosive alkalis and alkali-like substances, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  23. T54.3X3
    Toxic effect of corrosive alkalis and alkali-like substances, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  24. T54.3X4
    Toxic effect of corrosive alkalis and alkali-like substances, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T54.9
    Toxic effects of unspecified corrosive substance
    Header
  26. T54.91
    Toxic effect of unspecified corrosive substance, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  27. T54.92
    Toxic effect of unspecified corrosive substance, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  28. T54.93
    Toxic effect of unspecified corrosive substance, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  29. T54.94
    Toxic effect of unspecified corrosive substance, 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

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 T54 defined here

The appropriate 7th character is to be added to each code from category T54

7th characters for T54
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

  • Necrosis, necrotic (ischemic)phosphorus → T54.2

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

Hierarchy