ICDwise
W33 ⚠ Non-billable

Accidental rifle, shotgun and larger firearm discharge and malfunction

ICD-10-CM · FY2026 · External Causes of Morbidity

Code
W33
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
External Causes of Morbidity
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Includes
  • rifle, shotgun and larger firearm discharge and malfunction NOS
Excludes1 — never code together
  • 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)
7th character
  • The appropriate 7th character is to be added to each code from category W33

Frequently asked questions

What is ICD-10 code W33?
ICD-10-CM code W33 represents Accidental rifle, shotgun and larger firearm discharge and malfunction. It is a non-billable header code requiring a more specific subcategory in the External Causes of Morbidity chapter, effective October 1, 2025 – September 30, 2026.
Is W33 billable?
No. W33 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is W33 in?
W33 belongs to the External Causes of Morbidity chapter (V00–Y99) of ICD-10-CM.

Related codes in the W33 category

W33.0 Accidental rifle, shotgun and larger firearm discharge Non-billable W33.1 Accidental rifle, shotgun and larger firearm malfunction Non-billable W33.00 Accidental discharge of unspecified larger firearm Non-billable W33.01 Accidental discharge of shotgun Non-billable W33.02 Accidental discharge of hunting rifle Non-billable W33.03 Accidental discharge of machine gun Non-billable W33.09 Accidental discharge of other larger firearm Non-billable W33.10 Accidental malfunction of unspecified larger firearm Non-billable

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