ICD-10-CM 2027 diagnosis code
W20Struck by thrown, projected or falling object
W20 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
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 W20
W20 is the ICD-10-CM diagnosis code for struck by thrown, projected or falling object. It belongs to block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: W20.0 (cave-in), W20.1 (building) and W20.8 (object).
Don't report W20 together with the conditions in its Excludes1 note: falling object in machinery accident (W24, W28-W31), falling object in transport accident (V01-V99), object set in motion by explosion (W35-W40), object set in motion by firearm (W32-W34) and 1 more.
Code first any associated: cataclysm (X34-X39) and lightning strike (T75.00).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under W20
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to W20.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
Codes whose notes reference W20
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about W20
Is W20 billable?
- No. W20 is a header code. Report one of its more specific subcodes instead.