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ICD-10-CM 2027 diagnosis code

W21.4XXDStriking against diving board, subsequent encounter

✓ Billable / specificPOA exemptRequires 7th character

W21.4XXD is a valid, billable ICD-10-CM code for striking against diving board, subsequent encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About W21.4XXD

W21.4XXD is the ICD-10-CM diagnosis code for striking against diving board, subsequent encounter. It belongs to category W21 (striking against or struck by sports equipment), block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "D" means subsequent encounter: use it for encounters after active treatment, while the patient is healing or recovering.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as E917.0 (striking against or struck accidentally by objects or persons in sports).

7th character

Dsubsequent encounter

Other encounter types for W21.4:

Notes that apply from higher levels

Instructions written at a parent level also apply to W21.4XXD.

› From W21.4 Striking against diving board
Use additional code
  • code for subsequent falling into water, if applicable (W16.-)
› From W21 Striking against or struck by sports equipment
Excludes1
  • assault with sports equipment (Y08.0-)
  • striking against or struck by sports equipment with subsequent fall (W18.01)

Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.

ICD-9-CM equivalent

Converter →
  • E917.0Striking against or struck accidentally by objects or persons in sportsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about W21.4XXD

Is W21.4XXD billable?

Yes. W21.4XXD is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "D" at the end of W21.4XXD mean?

It is the 7th character for subsequent encounter. Per the official guidelines, use it for encounters after active treatment, while the patient is healing or recovering.

Can W21.4XXD be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict W21.4XXD as a principal diagnosis.

Is W21.4XXD a CC or MCC?

No. W21.4XXD is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for W21.4XXD?

The CMS General Equivalence Mappings map W21.4XXD to ICD-9-CM E917.0.