Explosion of other materials (W40) ICD-10-CM
The W40 code range covers explosion of other materials with 17 ICD-10-CM diagnosis codes. 12 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- 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 Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category W40
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the W40 Range 17 codes · 12 billable
- W40 Explosion of other materialsNon-billable
- W40.0 Explosion of blasting materialNon-billable
- W40.0XXA Explosion of blasting material, initial encounter
- W40.0XXD Explosion of blasting material, subsequent encounter
- W40.0XXS Explosion of blasting material, sequela
- W40.1 Explosion of explosive gasesNon-billable
- W40.1XXA Explosion of explosive gases, initial encounter
- W40.1XXD Explosion of explosive gases, subsequent encounter
- W40.1XXS Explosion of explosive gases, sequela
- W40.8 Explosion of other specified explosive materialsNon-billable
- W40.8XXA Explosion of other specified explosive materials, initial encounter
- W40.8XXD Explosion of other specified explosive materials, subsequent encounter
- W40.8XXS Explosion of other specified explosive materials, sequela
- W40.9 Explosion of unspecified explosive materialsNon-billable
- W40.9XXA Explosion of unspecified explosive materials, initial encounter
- W40.9XXD Explosion of unspecified explosive materials, subsequent encounter
- W40.9XXS Explosion of unspecified explosive materials, sequela
About the W40 Code Range
These codes describe explosions involving blasting material, explosive gases, or other explosive materials. They sit within external causes involving inanimate mechanical forces.
The subdivisions separate blasting material (W40.0), explosive gases (W40.1), other specified explosive materials (W40.8), and unspecified explosive materials (W40.9). Each subdivision ends with a character for an initial encounter (A), subsequent encounter (D), or later effect, called a sequela (S).
Questions About This Page
How many billable codes are in the W40 range?
Of the 17 codes in this range, 12 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the W40 range classify?
The range classifies explosion of other materials. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
