DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T58 Toxic effect of carbon monoxide

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

T58 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.

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. T58 Toxic effect of carbon monoxide
Billable codes
60
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
5
New FY2027
0
Index entries
0

Codes in T58

  1. T58.0
    Toxic effect of carbon monoxide from motor vehicle exhaust
    Header
    Inclusion terms 2

    Inclusion terms

    • Toxic effect of exhaust gas from gas engine
    • Toxic effect of exhaust gas from motor pump
  2. T58.01
    Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  3. T58.02
    Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  4. T58.03
    Toxic effect of carbon monoxide from motor vehicle exhaust, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  5. T58.04
    Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T58.1
    Toxic effect of carbon monoxide from utility gas
    Header
    Inclusion terms 3

    Inclusion terms

    • Toxic effect of acetylene
    • Toxic effect of gas NOS used for lighting, heating, cooking
    • Toxic effect of water gas
  7. T58.11
    Toxic effect of carbon monoxide from utility gas, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. T58.12
    Toxic effect of carbon monoxide from utility gas, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  9. T58.13
    Toxic effect of carbon monoxide from utility gas, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  10. T58.14
    Toxic effect of carbon monoxide from utility gas, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  11. T58.2
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels
    Header
    Inclusion terms 1

    Inclusion terms

    • Toxic effect of carbon monoxide from incomplete combustion of coal, coke, kerosene, wood
  12. T58.2X
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels
    Header
  13. T58.2X1
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  14. T58.2X2
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  15. T58.2X3
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. T58.2X4
    Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. T58.8
    Toxic effect of carbon monoxide from other source
    Header
    Inclusion terms 3

    Inclusion terms

    • Toxic effect of carbon monoxide from blast furnace gas
    • Toxic effect of carbon monoxide from fuels in industrial use
    • Toxic effect of carbon monoxide from kiln vapor
  18. T58.8X
    Toxic effect of carbon monoxide from other source
    Header
  19. T58.8X1
    Toxic effect of carbon monoxide from other source, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  20. T58.8X2
    Toxic effect of carbon monoxide from other source, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  21. T58.8X3
    Toxic effect of carbon monoxide from other source, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  22. T58.8X4
    Toxic effect of carbon monoxide from other source, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  23. T58.9
    Toxic effect of carbon monoxide from unspecified source
    Header
  24. T58.91
    Toxic effect of carbon monoxide from unspecified source, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T58.92
    Toxic effect of carbon monoxide from unspecified source, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  26. T58.93
    Toxic effect of carbon monoxide from unspecified source, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  27. T58.94
    Toxic effect of carbon monoxide from unspecified source, 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 T58

Includes

  • asphyxiation from carbon monoxide
  • toxic effect of carbon monoxide from all sources

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 T58 defined here

The appropriate 7th character is to be added to each code from category T58

7th characters for T58
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.

Hierarchy