2020 ICD-10-CM Diagnosis Code Y21.9

Unspecified drowning and submersion, undetermined intent

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • Y21.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM Y21.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of Y21.9 - other international versions of ICD-10 Y21.9 may differ.
ICD-10-CM Coding Rules
  • Y21.9 describes the circumstance causing an injury, not the nature of the injury.
The following code(s) above Y21.9 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 Y21.9:
  • V00-Y99
    2020 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
  • Y21-Y33
    2020 ICD-10-CM Range Y21-Y33

    Event of undetermined intent

    Applicable To
    • Undetermined intent is only for use when there is specific documentation in the record that the intent of the injury cannot be determined. If no such documentation is present, code to accidental (unintentional)
    Event of undetermined intent
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

External Cause Index entries containing back-references to Y21.9:
  • Drowning (accidental) W74
    ICD-10-CM Diagnosis Code W74

    Unspecified cause of accidental drowning and submersion

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Drowning NOS
    • stated as undetermined whether accidental or intentional Y21.9
  • Undetermined intent (contact) (exposure)

ICD-10-CM Codes Adjacent To Y21.9
Y21.3XXD …… subsequent encounter
Y21.3XXS …… sequela
Y21.4 Drowning and submersion in natural water, undetermined intent
Y21.4XXA …… initial encounter
Y21.4XXD …… subsequent encounter
Y21.4XXS …… sequela
Y21.8 Other drowning and submersion, undetermined intent
Y21.8XXA …… initial encounter
Y21.8XXD …… subsequent encounter
Y21.8XXS …… sequela
Y21.9 Unspecified drowning and submersion, undetermined intent
Y21.9XXA …… initial encounter
Y21.9XXD …… subsequent encounter
Y21.9XXS …… sequela
Y22 Handgun discharge, undetermined intent
Y22.XXXA Handgun discharge, undetermined intent, initial encounter
Y22.XXXD Handgun discharge, undetermined intent, subsequent encounter
Y22.XXXS Handgun discharge, undetermined intent, sequela
Y23 Rifle, shotgun and larger firearm discharge, undetermined intent
Y23.0 Shotgun discharge, undetermined intent
Y23.0XXA …… initial encounter

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