2021 ICD-10-CM Diagnosis Code Y04.0XXA

Assault by unarmed brawl or fight, initial encounter

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • Y04.0XXA is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM Y04.0XXA became effective on October 1, 2020.
  • This is the American ICD-10-CM version of Y04.0XXA - other international versions of ICD-10 Y04.0XXA may differ.
ICD-10-CM Coding Rules
  • Y04.0XXA describes the circumstance causing an injury, not the nature of the injury.
The following code(s) above Y04.0XXA 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 Y04.0XXA:
  • 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
  • X92-Y09
    2021 ICD-10-CM Range X92-Y09


    • homicide
    • injuries inflicted by another person with intent to injure or kill, by any means
    Type 1 Excludes
    • injuries due to legal intervention (Y35.-)
    • injuries due to operations of war (Y36.-)
    • injuries due to terrorism (Y38.-)
  • Y04
    ICD-10-CM Diagnosis Code Y04

    Assault by bodily force

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Assault by bodily force
Approximate Synonyms
  • Cause of assault, unarmed fight or brawl
  • Injury due to unarmed fight or brawl

Convert Y04.0XXA to ICD-9-CM

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
ICD-10-CM Codes Adjacent To Y04.0XXA
Y03.0 Assault by being hit or run over by motor vehicle
Y03.0XXA …… initial encounter
Y03.0XXD …… subsequent encounter
Y03.0XXS …… sequela
Y03.8 Other assault by crashing of motor vehicle
Y03.8XXA …… initial encounter
Y03.8XXD …… subsequent encounter
Y03.8XXS …… sequela
Y04 Assault by bodily force
Y04.0 Assault by unarmed brawl or fight
Y04.0XXA …… initial encounter
Y04.0XXD …… subsequent encounter
Y04.0XXS …… sequela
Y04.1 Assault by human bite
Y04.1XXA …… initial encounter
Y04.1XXD …… subsequent encounter
Y04.1XXS …… sequela
Y04.2 Assault by strike against or bumped into by another person
Y04.2XXA …… initial encounter
Y04.2XXD …… subsequent encounter
Y04.2XXS …… sequela

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