ICD-10-CM 2027 diagnosis code
W40Explosion of other materials
W40 is a header code, so it can't be reported by itself. Choose one of the 4 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 W40
W40 is the ICD-10-CM diagnosis code for explosion of other materials. 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 4 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: W40.0 (material), W40.1 (gases), W40.8 (materials) and W40.9 (materials).
Don't report W40 together with the conditions in its Excludes1 note: assault by explosive material (X96), explosion involving legal intervention (Y35.1-), explosion involving military or war operations (Y36.0-, Y36.2-) and intentional self-harm by explosive material (X75).
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 W40
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to W40.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
Codes whose notes reference W40
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 W40
Is W40 billable?
- No. W40 is a header code. Report one of its more specific subcodes instead.