W21.4 – Striking against diving board
ICD-10-CM 2027 diagnosis code · Exposure to inanimate mechanical forces
- Code
W21.4(claims format:W214)- Description
- Striking against diving board
- Billable
- No – use a more specific code below
- 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
Billable codes under W21.4
W21.4 is a header code and cannot be used on claims. Choose the most specific code:
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).
| Character | Meaning |
|---|---|
A | initial encounter |
D | subsequent encounter |
S | sequela |
Notes for W21.4
- code for subsequent falling into water, if applicable (W16.-)
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
- The appropriate 7th character is to be added to each code from category W21
Block W20-W49
Related codes in W21
- W21.0 – Struck by hit or thrown ballHeader
- W21.1 – Struck by bat, racquet or clubHeader
- W21.2 – Struck by hockey stick or puckHeader
- W21.3 – Struck by sports foot wearHeader
- W21.8 – Striking against or struck by other sports equipmentHeader
- W21.9 – Striking against or struck by unspecified sports equipmentHeader
Frequently asked questions
What is ICD-10 code W21.4?
W21.4 is the ICD-10-CM code for striking against diving board, in the block W20-W49 (Exposure to inanimate mechanical forces).
Is W21.4 a billable code?
No. W21.4 is a header code with more specific child codes; report one of the billable codes listed above.
What category does W21.4 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.