2021 ICD-10-CM Diagnosis Code W34.1

Accidental malfunction from other and unspecified firearms and guns

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • W34.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • Short description: Accidental malfunction from other and unsp firearms and guns
  • The 2021 edition of ICD-10-CM W34.1 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of W34.1 - other international versions of ICD-10 W34.1 may differ.
ICD-10-CM Coding Rules
  • W34.1 describes the circumstance causing an injury, not the nature of the injury.
The following code(s) above W34.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to W34.1:
  • V00-Y99
    2021 ICD-10-CM Range V00-Y99

    External causes of morbidity

    • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
    External causes of morbidity
  • W20-W49
    2021 ICD-10-CM Range W20-W49

    Exposure to inanimate mechanical forces

    Type 1 Excludes
    • 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)
    Exposure to inanimate mechanical forces
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to W34.1:
  • Type 1 Excludes: W23
    ICD-10-CM Diagnosis Code W23

    Caught, crushed, jammed or pinched in or between objects

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • injury caused by cutting or piercing instruments (W25-W27)
    • injury caused by firearms malfunction (W32.1, W33.1-, W34.1-)
    • injury caused by lifting and transmission devices (W24.-)
    • injury caused by machinery (W28-W31)
    • injury caused by nonpowered hand tools (W27.-)
    • injury caused by transport vehicle being used as a means of transportation (V01-V99)
    • injury caused by struck by thrown, projected or falling object (W20.-)
ICD-10-CM Codes Adjacent To W34.1
W34.011D …… subsequent encounter
W34.011S …… sequela
W34.018 Accidental discharge of other gas, air or spring-operated gun
W34.018A …… initial encounter
W34.018D …… subsequent encounter
W34.018S …… sequela
W34.09 Accidental discharge from other specified firearms
W34.09XA …… initial encounter
W34.09XD …… subsequent encounter
W34.09XS …… sequela
W34.1 Accidental malfunction from other and unspecified firearms and guns
W34.10 Accidental malfunction from unspecified firearms or gun
W34.10XA …… initial encounter
W34.10XD …… subsequent encounter
W34.10XS …… sequela
W34.11 Accidental malfunction of gas, air or spring-operated guns
W34.110 Accidental malfunction of airgun
W34.110A …… initial encounter
W34.110D …… subsequent encounter
W34.110S …… sequela
W34.111 Accidental malfunction of paintball gun

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.