MCMCB Pro
W40.1XXS

W40.1XXSExplosion of explosive gases, sequela

Billable / specific codeICD-10-CMPOA exempt

W40.1XXS is a billable, specific ICD-10-CM code for explosion of explosive gases, sequela. It is valid for submission on a claim.

7th character "S" — sequela

The appropriate 7th character is to be added to each code from category W40

A
initial encounter
D
subsequent encounter
S
sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Explosion of acetylene
  • Explosion of butane
  • Explosion of coal gas
  • Explosion in mine NOS
  • Explosion of explosive gas
  • Explosion of fire damp
  • Explosion of gasoline fumes
  • Explosion of methane
  • Explosion of propane

Risk adjustment

W40.1XXS does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Related codes at this level

Codes that share W40.1. If W40.1XXS is not quite right, the correct code is usually one of these.

Questions about W40.1XXS

Is W40.1XXS a billable ICD-10-CM code?
Yes. W40.1XXS is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does W40.1XXS sit in the tabular list?
External causes of morbidity (V00-Y99), in the block Exposure to inanimate mechanical forces (W20-W49).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.