ICD-10-CM > V00-Y99 > W20-W49 > W33 > W33.1 > W33.10 W33.10 Accidental malfunction of unspecified larger firearm Non-Billable/Non-Specific Applicable To Malfunction of unspecified larger firearm NOS Codes W33.10XA..., initial encounterW33.10XD..., subsequent encounterW33.10XS..., sequela