2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Acc rifle, shotgun and larger firearm discharge and malfunct
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to W33: its own notes plus those printed at block W20-W49 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • rifle, shotgun and larger firearm discharge and malfunction NOS

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On W33 itself
  • 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)
From Block W20-W49 Exposure to inanimate mechanical forces applies to 510 codes
  • assault (X92-Y09)
  • contact or collision with animals or persons (W50-W64)
  • exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)
  • intentional self-harm (X71-X83)

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category W33
Values for category W33 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name W33, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming W33: they are not reported together with it, unless the two conditions are unrelated.

  • W20 Struck by thrown, projected or falling object
    object set in motion by firearm (W32-W34) names W32-W34, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About W33Overview

What is the ICD-10 code for accidental rifle, shotgun and larger firearm discharge and malfunction?

W33 is the ICD-10-CM category for accidental rifle, shotgun and larger firearm discharge and malfunction, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can W33 be reported with W34.010?

Not as a rule. The Excludes1 note on W33 lists "accidental airgun discharge and malfunction (W34.010, W34.110)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).