W21.4XXD – Striking against diving board, subsequent encounter

ICD-10-CM 2027 diagnosis code · Exposure to inanimate mechanical forces

Billable code

ICD-10-CM code W21.4XXD

Code: W21.4XXD (claims format: W214XXD)
Description: Striking against diving board, subsequent encounter
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 20. External causes of morbidity (V00-Y99)
Block: W20-W49 Exposure to inanimate mechanical forces
Parent codes: W21 › W21.4

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

W21 – Striking against or struck by sports equipment

Excludes1 (not coded here):

assault with sports equipment (Y08.0-)
striking against or struck by sports equipment with subsequent fall (W18.01)

7th character note:

The appropriate 7th character is to be added to each code from category W21

W21.4 – Striking against diving board

Use additional code:

code for subsequent falling into water, if applicable (W16.-)

Block W20-W49

Excludes1 (not coded here):

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)

Related codes in W21.4

Frequently asked questions

What is ICD-10 code W21.4XXD?

W21.4XXD is the ICD-10-CM code for striking against diving board, subsequent encounter, in the block W20-W49 (Exposure to inanimate mechanical forces).

Is W21.4XXD a billable code?

Yes. W21.4XXD is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does W21.4XXD belong to?

It belongs to category W21 – Striking against or struck by sports equipment.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.