2026 ICD-10-CM Diagnosis Code W33Accidental rifle, shotgun and larger firearm discharge and malfunction

ICD-10-CM Codes›V01–Y99›W20-W49›W33

ICD-10-CM W33
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

W33 is a non-billable ICD-10-CM category code for accidental rifle, shotgun and larger firearm discharge and malfunction, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W33.00XA, W33.00XD, W33.00XS, and W33.01XA.

Code Identity

ICD-10-CM Code
W33
Billable Status
No — Non-Billable Category
Code Describes
Accidental rifle, shotgun and larger firearm discharge and malfunction
Chapter
W20-W49
Exposure to inanimate mechanical forces

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW20-W49Exposure to inanimate mechanical forces
CategoryW33Accidental rifle, shotgun and larger firearm discharge and malfunction
This CodeW33Accidental rifle, shotgun and larger firearm discharge and malfunction

Specific Coding for Acc rifle, shotgun and larger firearm discharge and malfunctOverview

Non-specific codes like W33 require more characters. Use one of these billable codes instead:

  • W33.0 for Accidental rifle, shotgun and larger firearm discharge

  • W33.00 for Accidental discharge of unspecified larger firearm

  • W33.01 for Accidental discharge of shotgun

  • W33.02 for Accidental discharge of hunting rifle

  • W33.03 for Accidental discharge of machine gun

  • W33.09 for Accidental discharge of other larger firearm

  • W33.1 for Accidental rifle, shotgun and larger firearm malfunction

  • W33.10 for Accidental malfunction of unspecified larger firearm

  • W33.11 for Accidental malfunction of shotgun

  • W33.12 for Accidental malfunction of hunting rifle

  • W33.13 for Accidental malfunction of machine gun

  • W33.19 for Accidental malfunction of other larger firearm

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • rifle, shotgun and larger firearm discharge and malfunction NOS

Type 1 Excludes

  • 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 Note

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

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About W33Overview

Is W33 a billable code?

No. This is a category header that groups the codes for accidental rifle, shotgun and larger firearm discharge and malfunction, and headers cannot be submitted on claims. Claims for accidental rifle, shotgun and larger firearm discharge and malfunction need a more specific code from this category, such as W33.00XA, W33.00XD, and W33.00XS.