W33.1: Accidental rifle, shotgun and larger firearm malfunction
W33.1 is a non-billable header ICD-10-CM code for accidental rifle, shotgun and larger firearm malfunction. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category W33
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Injury due to explosion of rifle, shotgun and larger firearm (parts)
- Injury due to malfunction of mechanism or component of rifle, shotgun and larger firearm
- Injury due to piercing, cutting, crushing or pinching due to (by) slide trigger mechanism, scope or other gun part
- Injury due to recoil of rifle, shotgun and larger firearm
- Powder burn from rifle, shotgun and larger firearm
Excludes1 inherited from the categories above W33.1
A category’s note binds every code beneath it.
Written on W33: Accidental rifle, shotgun and larger firearm discharge and malfunction
- 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)
Other codes that can never be billed with W33.1
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead W33.1
5 child codes. Green means billable.