W40
ICD-10Non-billable categoryExplosion of other materials
Official ICD-10-CM descriptor (FY2026)
Explosion of other materials
W40 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- assault by explosive material (X96)
- explosion involving legal intervention (Y35.1-)
- explosion involving military or war operations (Y36.0-, Y36.2-)
- intentional self-harm by explosive material (X75)
7th character
- The appropriate 7th character is to be added to each code from category W40
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under W40
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.