2020 ICD-10-CM Diagnosis Code W21.4

Striking against diving board

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • W21.4 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 W21.4 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of W21.4 - other international versions of ICD-10 W21.4 may differ.
ICD-10-CM Coding Rules
  • W21.4 describes the circumstance causing an injury, not the nature of the injury.
Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code for subsequent falling into water, if applicable (
    ICD-10-CM Diagnosis Code W16
    • W16 Fall, jump or diving into water
      • W16.0 Fall into swimming pool
        • W16.01 Fall into swimming pool striking water surfac...
          • W16.011 Fall into swimming pool striking water surfac...
            • W16.011A Fall into swimming pool striking water surfac...
            • W16.011D Fall into swimming pool striking water surfac...
            • W16.011S Fall into swimming pool striking water surfac...
          • W16.012 Fall into swimming pool striking water surfac...
            • W16.012A Fall into swimming pool striking water surfac...
            • W16.012D Fall into swimming pool striking water surfac...
            • W16.012S Fall into swimming pool striking water surfac...
        • W16.02 Fall into swimming pool striking bottom
          • W16.021 Fall into swimming pool striking bottom causi...
            • W16.021A Fall into swimming pool striking bottom causi...
            • W16.021D Fall into swimming pool striking bottom causi...
            • W16.021S Fall into swimming pool striking bottom causi...
          • W16.022 Fall into swimming pool striking bottom causi...
            • W16.022A Fall into swimming pool striking bottom causi...
            • W16.022D Fall into swimming pool striking bottom causi...
            • W16.022S Fall into swimming pool striking bottom causi...
        • W16.03 Fall into swimming pool striking wall
          • W16.031 Fall into swimming pool striking wall causing...
            • W16.031A Fall into swimming pool striking wall causing...
            • W16.031D Fall into swimming pool striking wall causing...
            • W16.031S Fall into swimming pool striking wall causing...
          • W16.032 Fall into swimming pool striking wall causing...
            • W16.032A Fall into swimming pool striking wall causing...
            • W16.032D Fall into swimming pool striking wall causing...
            • W16.032S Fall into swimming pool striking wall causing...
      • W16.1 Fall into natural body of water
        • W16.11 Fall into natural body of water striking wate...
          • W16.111 Fall into natural body of water striking wate...
            • W16.111A Fall into natural body of water striking wate...
            • W16.111D Fall into natural body of water striking wate...
            • W16.111S Fall into natural body of water striking wate...
          • W16.112 Fall into natural body of water striking wate...
            • W16.112A Fall into natural body of water striking wate...
            • W16.112D Fall into natural body of water striking wate...
            • W16.112S Fall into natural body of water striking wate...
        • W16.12 Fall into natural body of water striking bott...
          • W16.121 Fall into natural body of water striking bott...
            • W16.121A Fall into natural body of water striking bott...
            • W16.121D Fall into natural body of water striking bott...
            • W16.121S Fall into natural body of water striking bott...
          • W16.122 Fall into natural body of water striking bott...
            • W16.122A Fall into natural body of water striking bott...
            • W16.122D Fall into natural body of water striking bott...
            • W16.122S Fall into natural body of water striking bott...
        • W16.13 Fall into natural body of water striking side...
          • W16.131 Fall into natural body of water striking side...
            • W16.131A Fall into natural body of water striking side...
            • W16.131D Fall into natural body of water striking side...
            • W16.131S Fall into natural body of water striking side...
          • W16.132 Fall into natural body of water striking side...
            • W16.132A Fall into natural body of water striking side...
            • W16.132D Fall into natural body of water striking side...
            • W16.132S Fall into natural body of water striking side...
      • W16.2 Fall in (into) filled bathtub or bucket of wa...
        • W16.21 Fall in (into) filled bathtub
          • W16.211 Fall in (into) filled bathtub causing drownin...
            • W16.211A Fall in (into) filled bathtub causing drownin...
            • W16.211D Fall in (into) filled bathtub causing drownin...
            • W16.211S Fall in (into) filled bathtub causing drownin...
          • W16.212 Fall in (into) filled bathtub causing other i...
            • W16.212A Fall in (into) filled bathtub causing other i...
            • W16.212D Fall in (into) filled bathtub causing other i...
            • W16.212S Fall in (into) filled bathtub causing other i...
        • W16.22 Fall in (into) bucket of water
          • W16.221 Fall in (into) bucket of water causing drowni...
            • W16.221A Fall in (into) bucket of water causing drowni...
            • W16.221D Fall in (into) bucket of water causing drowni...
            • W16.221S Fall in (into) bucket of water causing drowni...
          • W16.222 Fall in (into) bucket of water causing other ...
            • W16.222A Fall in (into) bucket of water causing other ...
            • W16.222D Fall in (into) bucket of water causing other ...
            • W16.222S Fall in (into) bucket of water causing other ...
      • W16.3 Fall into other water
        • W16.31 Fall into other water striking water surface
          • W16.311 Fall into other water striking water surface ...
            • W16.311A Fall into other water striking water surface ...
            • W16.311D Fall into other water striking water surface ...
            • W16.311S Fall into other water striking water surface ...
          • W16.312 Fall into other water striking water surface ...
            • W16.312A Fall into other water striking water surface ...
            • W16.312D Fall into other water striking water surface ...
            • W16.312S Fall into other water striking water surface ...
        • W16.32 Fall into other water striking bottom
          • W16.321 Fall into other water striking bottom causing...
            • W16.321A Fall into other water striking bottom causing...
            • W16.321D Fall into other water striking bottom causing...
            • W16.321S Fall into other water striking bottom causing...
          • W16.322 Fall into other water striking bottom causing...
            • W16.322A Fall into other water striking bottom causing...
            • W16.322D Fall into other water striking bottom causing...
            • W16.322S Fall into other water striking bottom causing...
        • W16.33 Fall into other water striking wall
          • W16.331 Fall into other water striking wall causing d...
            • W16.331A Fall into other water striking wall causing d...
            • W16.331D Fall into other water striking wall causing d...
            • W16.331S Fall into other water striking wall causing d...
          • W16.332 Fall into other water striking wall causing o...
            • W16.332A Fall into other water striking wall causing o...
            • W16.332D Fall into other water striking wall causing o...
            • W16.332S Fall into other water striking wall causing o...
      • W16.4 Fall into unspecified water
        • W16.41 Fall into unspecified water causing drowning ...
          • W16.41XA Fall into unspecified water causing drowning ...
          • W16.41XD Fall into unspecified water causing drowning ...
          • W16.41XS Fall into unspecified water causing drowning ...
        • W16.42 Fall into unspecified water causing other inj...
          • W16.42XA Fall into unspecified water causing other inj...
          • W16.42XD Fall into unspecified water causing other inj...
          • W16.42XS Fall into unspecified water causing other inj...
      • W16.5 Jumping or diving into swimming pool
        • W16.51 Jumping or diving into swimming pool striking...
          • W16.511 Jumping or diving into swimming pool striking...
            • W16.511A Jumping or diving into swimming pool striking...
            • W16.511D Jumping or diving into swimming pool striking...
            • W16.511S Jumping or diving into swimming pool striking...
          • W16.512 Jumping or diving into swimming pool striking...
            • W16.512A Jumping or diving into swimming pool striking...
            • W16.512D Jumping or diving into swimming pool striking...
            • W16.512S Jumping or diving into swimming pool striking...
        • W16.52 Jumping or diving into swimming pool striking...
          • W16.521 Jumping or diving into swimming pool striking...
            • W16.521A Jumping or diving into swimming pool striking...
            • W16.521D Jumping or diving into swimming pool striking...
            • W16.521S Jumping or diving into swimming pool striking...
          • W16.522 Jumping or diving into swimming pool striking...
            • W16.522A Jumping or diving into swimming pool striking...
            • W16.522D Jumping or diving into swimming pool striking...
            • W16.522S Jumping or diving into swimming pool striking...
        • W16.53 Jumping or diving into swimming pool striking...
          • W16.531 Jumping or diving into swimming pool striking...
            • W16.531A Jumping or diving into swimming pool striking...
            • W16.531D Jumping or diving into swimming pool striking...
            • W16.531S Jumping or diving into swimming pool striking...
          • W16.532 Jumping or diving into swimming pool striking...
            • W16.532A Jumping or diving into swimming pool striking...
            • W16.532D Jumping or diving into swimming pool striking...
            • W16.532S Jumping or diving into swimming pool striking...
      • W16.6 Jumping or diving into natural body of water
        • W16.61 Jumping or diving into natural body of water ...
          • W16.611 Jumping or diving into natural body of water ...
            • W16.611A Jumping or diving into natural body of water ...
            • W16.611D Jumping or diving into natural body of water ...
            • W16.611S Jumping or diving into natural body of water ...
          • W16.612 Jumping or diving into natural body of water ...
            • W16.612A Jumping or diving into natural body of water ...
            • W16.612D Jumping or diving into natural body of water ...
            • W16.612S Jumping or diving into natural body of water ...
        • W16.62 Jumping or diving into natural body of water ...
          • W16.621 Jumping or diving into natural body of water ...
            • W16.621A Jumping or diving into natural body of water ...
            • W16.621D Jumping or diving into natural body of water ...
            • W16.621S Jumping or diving into natural body of water ...
          • W16.622 Jumping or diving into natural body of water ...
            • W16.622A Jumping or diving into natural body of water ...
            • W16.622D Jumping or diving into natural body of water ...
            • W16.622S Jumping or diving into natural body of water ...
      • W16.7 Jumping or diving from boat
        • W16.71 Jumping or diving from boat striking water su...
          • W16.711 Jumping or diving from boat striking water su...
            • W16.711A Jumping or diving from boat striking water su...
            • W16.711D Jumping or diving from boat striking water su...
            • W16.711S Jumping or diving from boat striking water su...
          • W16.712 Jumping or diving from boat striking water su...
            • W16.712A Jumping or diving from boat striking water su...
            • W16.712D Jumping or diving from boat striking water su...
            • W16.712S Jumping or diving from boat striking water su...
        • W16.72 Jumping or diving from boat striking bottom
          • W16.721 Jumping or diving from boat striking bottom c...
            • W16.721A Jumping or diving from boat striking bottom c...
            • W16.721D Jumping or diving from boat striking bottom c...
            • W16.721S Jumping or diving from boat striking bottom c...
          • W16.722 Jumping or diving from boat striking bottom c...
            • W16.722A Jumping or diving from boat striking bottom c...
            • W16.722D Jumping or diving from boat striking bottom c...
            • W16.722S Jumping or diving from boat striking bottom c...
      • W16.8 Jumping or diving into other water
        • W16.81 Jumping or diving into other water striking w...
          • W16.811 Jumping or diving into other water striking w...
            • W16.811A Jumping or diving into other water striking w...
            • W16.811D Jumping or diving into other water striking w...
            • W16.811S Jumping or diving into other water striking w...
          • W16.812 Jumping or diving into other water striking w...
            • W16.812A Jumping or diving into other water striking w...
            • W16.812D Jumping or diving into other water striking w...
            • W16.812S Jumping or diving into other water striking w...
        • W16.82 Jumping or diving into other water striking b...
          • W16.821 Jumping or diving into other water striking b...
            • W16.821A Jumping or diving into other water striking b...
            • W16.821D Jumping or diving into other water striking b...
            • W16.821S Jumping or diving into other water striking b...
          • W16.822 Jumping or diving into other water striking b...
            • W16.822A Jumping or diving into other water striking b...
            • W16.822D Jumping or diving into other water striking b...
            • W16.822S Jumping or diving into other water striking b...
        • W16.83 Jumping or diving into other water striking w...
          • W16.831 Jumping or diving into other water striking w...
            • W16.831A Jumping or diving into other water striking w...
            • W16.831D Jumping or diving into other water striking w...
            • W16.831S Jumping or diving into other water striking w...
          • W16.832 Jumping or diving into other water striking w...
            • W16.832A Jumping or diving into other water striking w...
            • W16.832D Jumping or diving into other water striking w...
            • W16.832S Jumping or diving into other water striking w...
      • W16.9 Jumping or diving into unspecified water
        • W16.91 Jumping or diving into unspecified water caus...
          • W16.91XA Jumping or diving into unspecified water caus...
          • W16.91XD Jumping or diving into unspecified water caus...
          • W16.91XS Jumping or diving into unspecified water caus...
        • W16.92 Jumping or diving into unspecified water caus...
          • W16.92XA Jumping or diving into unspecified water caus...
          • W16.92XD Jumping or diving into unspecified water caus...
          • W16.92XS Jumping or diving into unspecified water caus...
    W16.-
    )
The following code(s) above W21.4 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 W21.4:
  • V00-Y99
    2020 ICD-10-CM Range V00-Y99

    External causes of morbidity

    Note
    • 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
    2020 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
  • W21
    ICD-10-CM Diagnosis Code W21

    Striking against or struck by sports equipment

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • assault with sports equipment (Y08.0-)
    • striking against or struck by sports equipment with subsequent fall (W18.01)
    Striking against or struck by sports equipment
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
Code annotations containing back-references to W21.4:
  • Type 2 Excludes: W16
    ICD-10-CM Diagnosis Code W16

    Fall, jump or diving into water

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • accidental non-watercraft drowning and submersion not involving fall (W65-W74)
    • effects of air pressure from diving (W94.-)
    • fall into water from watercraft (V90-V94)
    • hitting an object or against bottom when falling from watercraft (V94.0)
    Type 2 Excludes
    • striking or hitting diving board (W21.4)

External Cause Index entries containing back-references to W21.4:
  • Fall, falling (accidental) W19
    ICD-10-CM Diagnosis Code W19

    Unspecified fall

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Accidental fall NOS
    • into
      • water W16.42
        ICD-10-CM Diagnosis Code W16.42

        Fall into unspecified water causing other injury

          2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
        • hitting diving board W21.4
  • Striking against
    • diving board W21.4 (swimming-pool)

ICD-10-CM Codes Adjacent To W21.4
W21.31XD …… subsequent encounter
W21.31XS …… sequela
W21.32 Struck by skate blades
W21.32XA …… initial encounter
W21.32XD …… subsequent encounter
W21.32XS …… sequela
W21.39 Struck by other sports foot wear
W21.39XA …… initial encounter
W21.39XD …… subsequent encounter
W21.39XS …… sequela
W21.4 Striking against diving board
W21.4XXA …… initial encounter
W21.4XXD …… subsequent encounter
W21.4XXS …… sequela
W21.8 Striking against or struck by other sports equipment
W21.81 Striking against or struck by football helmet
W21.81XA …… initial encounter
W21.81XD …… subsequent encounter
W21.81XS …… sequela
W21.89 Striking against or struck by other sports equipment
W21.89XA …… initial encounter

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