Accidental rifle, shotgun and larger firearm discharge and malfunction
In Exposure to inanimate mechanical forces (W20-W49), chapter 20: External Causes of Morbidity
30 billable codes under W33: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- rifle, shotgun and larger firearm discharge and malfunction NOS
Excludes1: not coded here, use a different 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)
Also applies, from Exposure to inanimate mechanical forces (W20-W49)
These notes sit on W20-W49 and apply to every code under it, including W33.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.
- General External Cause Coding Guidelines (page 88)
- Place of Occurrence Guideline (page 89)
- Activity Code (page 89)
- Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
- If the Reporting Format Limits the Number of External Cause Codes (page 90)
- Multiple External Cause Coding Guidelines (page 90)
- Child and Adult Abuse Guideline (page 90)
- Unknown or Undetermined Intent Guideline (page 91)
All codes under W33
W33 can't be used on a claim. Pick a billable code below; grey headings group them.
- W33.0Accidental rifle, shotgun and larger firearm discharge
- W33.00Accidental discharge of unspecified larger firearm
- W33.00XAAccidental discharge of unspecified larger firearm, initial encounter
- W33.00XDAccidental discharge of unspecified larger firearm, subsequent encounter
- W33.00XSAccidental discharge of unspecified larger firearm, sequela
- W33.01Accidental discharge of shotgun
- W33.01XAAccidental discharge of shotgun, initial encounter
- W33.01XDAccidental discharge of shotgun, subsequent encounter
- W33.01XSAccidental discharge of shotgun, sequela
- W33.02Accidental discharge of hunting rifle
- W33.02XAAccidental discharge of hunting rifle, initial encounter
- W33.02XDAccidental discharge of hunting rifle, subsequent encounter
- W33.02XSAccidental discharge of hunting rifle, sequela
- W33.03Accidental discharge of machine gun
- W33.03XAAccidental discharge of machine gun, initial encounter
- W33.03XDAccidental discharge of machine gun, subsequent encounter
- W33.03XSAccidental discharge of machine gun, sequela
- W33.09Accidental discharge of other larger firearm
- W33.09XAAccidental discharge of other larger firearm, initial encounter
- W33.09XDAccidental discharge of other larger firearm, subsequent encounter
- W33.09XSAccidental discharge of other larger firearm, sequela
- W33.1Accidental rifle, shotgun and larger firearm malfunction
- W33.10Accidental malfunction of unspecified larger firearm
- W33.10XAAccidental malfunction of unspecified larger firearm, initial encounter
- W33.10XDAccidental malfunction of unspecified larger firearm, subsequent encounter
- W33.10XSAccidental malfunction of unspecified larger firearm, sequela
- W33.11Accidental malfunction of shotgun
- W33.11XAAccidental malfunction of shotgun, initial encounter
- W33.11XDAccidental malfunction of shotgun, subsequent encounter
- W33.11XSAccidental malfunction of shotgun, sequela
- W33.12Accidental malfunction of hunting rifle
- W33.12XAAccidental malfunction of hunting rifle, initial encounter
- W33.12XDAccidental malfunction of hunting rifle, subsequent encounter
- W33.12XSAccidental malfunction of hunting rifle, sequela
- W33.13Accidental malfunction of machine gun
- W33.13XAAccidental malfunction of machine gun, initial encounter
- W33.13XDAccidental malfunction of machine gun, subsequent encounter
- W33.13XSAccidental malfunction of machine gun, sequela
- W33.19Accidental malfunction of other larger firearm
- W33.19XAAccidental malfunction of other larger firearm, initial encounter
- W33.19XDAccidental malfunction of other larger firearm, subsequent encounter
- W33.19XSAccidental malfunction of other larger firearm, sequela
W33 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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. Injuries can happen at work or play, indoors or outdoors, driving a car, or walking across the street.
Read more about wounds and injuries on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.