| W40 | Explosion of other materials | NON-BILLABLE CODE |
| W40.0 | Explosion of blasting material | NON-BILLABLE CODE |
| W40.0XXA | Explosion of blasting material, initial encounter | BILLABLE CODE |
| W40.0XXD | Explosion of blasting material, subsequent encounter | BILLABLE CODE |
| W40.0XXS | Explosion of blasting material, sequela | BILLABLE CODE |
| W40.1 | Explosion of explosive gases | NON-BILLABLE CODE |
| W40.1XXA | Explosion of explosive gases, initial encounter | BILLABLE CODE |
| W40.1XXD | Explosion of explosive gases, subsequent encounter | BILLABLE CODE |
| W40.1XXS | Explosion of explosive gases, sequela | BILLABLE CODE |
| W40.8 | Explosion of other specified explosive materials | NON-BILLABLE CODE |
| W40.8XXA | Explosion of other specified explosive materials, initial encounter | BILLABLE CODE |
| W40.8XXD | Explosion of other specified explosive materials, subsequent encounter | BILLABLE CODE |
| W40.9 | Explosion of unspecified explosive materials | NON-BILLABLE CODE |
| W40.9XXA | Explosion of unspecified explosive materials, initial encounter | BILLABLE CODE |
| W40.9XXD | Explosion of unspecified explosive materials, subsequent encounter | BILLABLE CODE |
| W40.9XXS | Explosion of unspecified explosive materials, sequela | BILLABLE CODE |
