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ICD-10/W33.10XS

W33.10XS ICD-10-CM Code: Accidental malfunction of unspecified larger firearm, sequela

W33.10XS is the authoritative medical code for Accidental malfunction of unspecified larger firearm, sequela. This classification is used in medical billing and clinical recording to specify the clinical criteria for accidental malfunction of unspecified larger firearm, sequela (ICD-10-CM W33.10XS), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Accidental malfunction of unspecified larger firearm, sequela is a billable ICD-10-CM diagnosis code (W33.10S). Includes: rifle, shotgun and larger firearm discharge and malfunction NOS. Inclusion terms: Malfunction of unspecified larger firearm NOS. Excludes1 (not coded here): 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); assault (X92-Y09); contact or collision with animals or persons (W50-W64); exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-); intentional self-harm (X71-X83). 7th character: The appropriate 7th character is to be added to each code from category W33.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for W33.10XS in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • rifle, shotgun and larger firearm discharge and malfunction NOS

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Malfunction of unspecified larger firearm NOS

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • 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)
  • assault (X92-Y09)
  • contact or collision with animals or persons (W50-W64)
  • exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)
  • intentional self-harm (X71-X83)

Frequently Asked Questions (FAQ) & Clinical Guidance

Does W33.10XS require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category W33.

What can't be coded together with W33.10XS?

Per official ICD-10-CM Excludes1 instructions, W33.10XS must not be reported together with: 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).

What conditions are included under W33.10XS?

Accidental malfunction of unspecified larger firearm, sequela includes: Malfunction of unspecified larger firearm NOS.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to W33.10XS in its code family, with their registry titles.

  • W33.09XS — Accidental discharge of other larger firearm, sequela
  • W33.1 — Accidental rifle, shotgun and larger firearm malfunction
  • W33.10 — Accidental malfunction of unspecified larger firearm
  • W33.10XA — Accidental malfunction of unspecified larger firearm, initial encounter
  • W33.10XD — Accidental malfunction of unspecified larger firearm, subsequent encounter
  • W33.11 — Accidental malfunction of shotgun
  • 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 rifle

View all codes in the W33 family