W33.13
W33.13: Accidental malfunction of machine gun
Non-billable headerICD-10-CM
W33.13 is a non-billable header ICD-10-CM code for accidental malfunction of machine gun. 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.
- Malfunction of machine gun NOS
Excludes1 inherited from the categories above W33.13
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)
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Alphabetic index entries that lead here
- Powder burn›machine gun
- Recoil›machine gun
- Explosion›firearm NEC›machine gun
- Malfunction›firearm›machine gun
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead W33.13
3 child codes. Green means billable.