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W33.00

⚠ Non-billable (Header)

Accidental discharge of unspecified larger firearm

External causes of morbidity (V00-Y99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Discharge of unspecified larger firearm NOS

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

W33
  • • 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)

Child Codes (3)

W33.00XAAccidental discharge of unspecified larger firearm, initial encounterW33.00XDAccidental discharge of unspecified larger firearm, subsequent encounterW33.00XSAccidental discharge of unspecified larger firearm, sequela

Clinical Description

ICD-10-CM code W33.00 represents accidental discharge of unspecified larger firearm. This code falls under the External causes of morbidity (V00-Y99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 6-character code at the 5th level of specificity. There are 3 more specific child codes under W33.00. Coders should note that W33.00 has 8 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code W33.00?

ICD-10-CM code W33.00 is "Accidental discharge of unspecified larger firearm". It belongs to the category: External causes of morbidity (V00-Y99).

Is W33.00 a billable ICD-10 code?

No, W33.00 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with W33.00?

W33.00 has 8 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in W33.0

Other codes in the same category that may be relevant for differential coding:

W33.01Accidental discharge of shotgunW33.02Accidental discharge of hunting rifleW33.03Accidental discharge of machine gunW33.09Accidental discharge of other larger firearm

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Code Information

CodeW33.00
BillableNo — Header code
ParentW33.0
CategoryExternal causes of morbidity (V00-Y99)
Excludes18 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)