ICD-10-CM 2027 diagnosis code
W40.1XXSExplosion of explosive gases, sequela
W40.1XXS is a valid, billable ICD-10-CM code for explosion of explosive gases, sequela. 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 W40.1XXS
W40.1XXS is the ICD-10-CM diagnosis code for explosion of explosive gases, sequela. It belongs to category W40 (explosion of other materials), 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 "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.
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 E929.8 (late effects of other accidents).
7th character
Ssequela
Other encounter types for W40.1:
Notes that apply from higher levels
Instructions written at a parent level also apply to W40.1XXS.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E929.8Late effects of other accidentsapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 W40.1XXS
Is W40.1XXS billable?
- Yes. W40.1XXS is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "S" at the end of W40.1XXS mean?
- It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.
Can W40.1XXS be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W40.1XXS as a principal diagnosis.
Is W40.1XXS a CC or MCC?
- No. W40.1XXS is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W40.1XXS?
- The CMS General Equivalence Mappings map W40.1XXS to ICD-9-CM E929.8.