Skip to content
Dx

ICD-10-CM 2027 diagnosis code

W33Accidental rifle, shotgun and larger firearm discharge and malfunction

Not billable — use a more specific code

W33 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.Short description: Acc rifle, shotgun and larger firearm discharge and malfunct

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 W33

W33 is the ICD-10-CM diagnosis code for accidental rifle, shotgun and larger firearm discharge and malfunction. It belongs to block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: W33.0 (discharge) and W33.1 (malfunction).

Don't report W33 together with the conditions in its Excludes1 note: accidental airgun discharge and malfunction (W34.010, W34.110), accidental BB gun discharge and malfunction (W34.010, W34.110), accidental handgun discharge and malfunction (W32.-), accidental pellet gun discharge and malfunction (W34.010, W34.110) and 4 more.

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

Specific codes under W33

Coding notes

IncludesFurther defines the content of the category
  • rifle, shotgun and larger firearm discharge and malfunction NOS
Excludes1Not coded here — never report together with this code
  • accidental airgun discharge and malfunction (W34.010, W34.110)
  • accidental BB gun discharge and malfunction (W34.010, W34.110)
  • accidental handgun discharge and malfunction (W32.-)
  • accidental pellet gun discharge and malfunction (W34.010, W34.110)
  • assault by rifle, shotgun and larger firearm discharge (X94)
  • firearm discharge involving legal intervention (Y35.0-)
  • firearm discharge involving military or war operations (Y36.4-)
  • intentional self-harm by rifle, shotgun and larger firearm discharge (X73)

Notes that apply from higher levels

Instructions written at a parent level also apply to W33.

Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.

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 W33

Is W33 billable?

No. W33 is a header code. Report one of its more specific subcodes instead.