DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

W33 Accidental rifle, shotgun and larger firearm discharge and malfunction

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

W33 is not billable. The category heads 30 billable codes in FY2027, grouped under 2 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. W20-W49 Exposure to inanimate mechanical forces (W20-W49)
  3. W33 Accidental rifle, shotgun and larger firearm discharge and malfunction
Billable codes
30
Subdivisions
2
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in W33

  1. W33.0
    Accidental rifle, shotgun and larger firearm discharge
    Header
  2. W33.00
    Accidental discharge of unspecified larger firearm +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Discharge of unspecified larger firearm NOS
  3. W33.01
    Accidental discharge of shotgun +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Discharge of shotgun NOS
  4. W33.02
    Accidental discharge of hunting rifle +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Discharge of hunting rifle NOS
  5. W33.03
    Accidental discharge of machine gun +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Discharge of machine gun NOS
  6. W33.09
    Accidental discharge of other larger firearm +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Discharge of other larger firearm NOS
  7. W33.1
    Accidental rifle, shotgun and larger firearm malfunction
    Header
    Inclusion terms 5

    Inclusion terms

    • Injury due to explosion of rifle, shotgun and larger firearm (parts)
    • Injury due to malfunction of mechanism or component of rifle, shotgun and larger firearm
    • Injury due to piercing, cutting, crushing or pinching due to (by) slide trigger mechanism, scope or other gun part
    • Injury due to recoil of rifle, shotgun and larger firearm
    • Powder burn from rifle, shotgun and larger firearm
  8. W33.10
    Accidental malfunction of unspecified larger firearm +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Malfunction of unspecified larger firearm NOS
  9. W33.11
    Accidental malfunction of shotgun +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Malfunction of shotgun NOS
  10. W33.12
    Accidental malfunction of hunting rifle +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Malfunction of hunting rifle NOS
  11. W33.13
    Accidental malfunction of machine gun +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Malfunction of machine gun NOS
  12. W33.19
    Accidental malfunction of other larger firearm +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 1

    Inclusion terms

    • Malfunction of other larger firearm NOS

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 W33

Includes

  • rifle, shotgun and larger firearm discharge and malfunction NOS

Excludes1

  • accidental airgun discharge and malfunction (W34.010, W34.110) W34.010 W34.110
  • accidental BB gun discharge and malfunction (W34.010, W34.110) W34.010 W34.110
  • accidental handgun discharge and malfunction (W32.-) W32
  • accidental pellet gun discharge and malfunction (W34.010, W34.110) W34.010 W34.110
  • assault by rifle, shotgun and larger firearm discharge (X94) X94
  • firearm discharge involving legal intervention (Y35.0-) Y35.0
  • firearm discharge involving military or war operations (Y36.4-) Y36.4
  • intentional self-harm by rifle, shotgun and larger firearm discharge (X73) X73

Notes that also apply

Block W20-W49 instructions (Excludes1 4): printed on the block page.

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

7th characters

7th characters for W33 defined here

The appropriate 7th character is to be added to each code from category W33

7th characters for W33
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