W33.0
Accidental rifle, shotgun and larger firearm discharge
W33.0 is a non-billable ICD-10-CM code header for accidental rifle, shotgun and larger firearm discharge. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are W33.00 Accidental discharge of unspecified larger firearm, W33.01 Accidental discharge of shotgun, W33.02 Accidental discharge of hunting rifle, W33.03 Accidental discharge of machine gun and 1 more. Its coding notes include 12 Excludes1 entries.
7th characters
Every code below needs one of these (defined at W33).
The appropriate 7th character is to be added to each code from category W33
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
An external cause code is never a principal or first-listed diagnosis. Its 7th character is assigned for each encounter and should match the injury or condition code.
Excludes1
Not coded here. The listed conditions generally should not be reported 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)
Includes
Further defines or gives examples of the content of the category.
- rifle, shotgun and larger firearm discharge and malfunction NOS
Notes
Also from chapter/block level (1 note)
- 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.
More specific codes under W33.0 5
- W33.00Accidental discharge of unspecified larger firearm7th char needed
- W33.01Accidental discharge of shotgun7th char needed
- W33.02Accidental discharge of hunting rifle7th char needed
- W33.03Accidental discharge of machine gun7th char needed
- W33.09Accidental discharge of other larger firearm7th char needed