Accidental rifle, shotgun and larger firearm discharge and malfunction (W33) ICD-10-CM
The W33 code range covers accidental rifle, shotgun and larger firearm discharge and malfunction with 43 ICD-10-CM diagnosis codes. 30 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- rifle, shotgun and larger firearm discharge and malfunction NOS
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- 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
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category W33
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the W33 Range 43 codes · 30 billable
- W33 Accidental rifle, shotgun and larger firearm discharge and malfunctionNon-billable
- W33.0 Accidental rifle, shotgun and larger firearm dischargeNon-billable
- W33.00 Accidental discharge of unspecified larger firearmNon-billable
- W33.00XA Accidental discharge of unspecified larger firearm, initial encounter
- W33.00XD Accidental discharge of unspecified larger firearm, subsequent encounter
- W33.00XS Accidental discharge of unspecified larger firearm, sequela
- W33.01 Accidental discharge of shotgunNon-billable
- W33.01XA Accidental discharge of shotgun, initial encounter
- W33.01XD Accidental discharge of shotgun, subsequent encounter
- W33.01XS Accidental discharge of shotgun, sequela
- W33.02 Accidental discharge of hunting rifleNon-billable
- W33.02XA Accidental discharge of hunting rifle, initial encounter
- W33.02XD Accidental discharge of hunting rifle, subsequent encounter
- W33.02XS Accidental discharge of hunting rifle, sequela
- W33.03 Accidental discharge of machine gunNon-billable
- W33.03XA Accidental discharge of machine gun, initial encounter
- W33.03XD Accidental discharge of machine gun, subsequent encounter
- W33.03XS Accidental discharge of machine gun, sequela
- W33.09 Accidental discharge of other larger firearmNon-billable
- W33.09XA Accidental discharge of other larger firearm, initial encounter
- W33.09XD Accidental discharge of other larger firearm, subsequent encounter
- W33.09XS Accidental discharge of other larger firearm, sequela
- W33.1 Accidental rifle, shotgun and larger firearm malfunctionNon-billable
- W33.10 Accidental malfunction of unspecified larger firearmNon-billable
- W33.10XA Accidental malfunction of unspecified larger firearm, initial encounter
- W33.10XD Accidental malfunction of unspecified larger firearm, subsequent encounter
- W33.10XS Accidental malfunction of unspecified larger firearm, sequela
- W33.11 Accidental malfunction of shotgunNon-billable
- W33.11XA Accidental malfunction of shotgun, initial encounter
- W33.11XD Accidental malfunction of shotgun, subsequent encounter
- W33.11XS Accidental malfunction of shotgun, sequela
- W33.12 Accidental malfunction of hunting rifleNon-billable
- W33.12XA Accidental malfunction of hunting rifle, initial encounter
- W33.12XD Accidental malfunction of hunting rifle, subsequent encounter
- W33.12XS Accidental malfunction of hunting rifle, sequela
- W33.13 Accidental malfunction of machine gunNon-billable
- W33.13XA Accidental malfunction of machine gun, initial encounter
- W33.13XD Accidental malfunction of machine gun, subsequent encounter
- W33.13XS Accidental malfunction of machine gun, sequela
- W33.19 Accidental malfunction of other larger firearmNon-billable
- W33.19XA Accidental malfunction of other larger firearm, initial encounter
- W33.19XD Accidental malfunction of other larger firearm, subsequent encounter
- W33.19XS Accidental malfunction of other larger firearm, sequela
About the W33 Code Range
These events involve the accidental discharge or malfunction of a rifle, shotgun, or larger firearm.
W33.0 describes accidental discharge, while W33.1 describes accidental malfunction. Each branch separates shotguns, hunting rifles, machine guns, other larger firearms, and unspecified larger firearms.
The seventh character marks an initial encounter (A), a subsequent encounter (D), or a sequela (S), meaning a later effect.
Questions About This Page
How many billable codes are in the W33 range?
Of the 43 codes in this range, 30 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the W33 range classify?
The range classifies accidental rifle, shotgun and larger firearm discharge and malfunction. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
