W40 vs X02
W40 (Explosion of other materials) compared with X02 (Exposure to controlled fire in building or structure), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. X02 carries an Excludes2 note covering W40: “explosions (W35-W40)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| W40Explosion of other materials | X02Exposure to controlled fire in building or structure | |
|---|---|---|
| Billing status | Non-billable header Report instead: W40.0XXA, W40.0XXD, W40.0XXS, W40.1XXA, W40.1XXD | Non-billable header Report instead: X02.0XXA, X02.0XXD, X02.0XXS, X02.1XXA, X02.1XXD |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Explosion of other materials is a non-billable ICD-10-CM category code (W40). | Exposure to controlled fire in building or structure is a non-billable ICD-10-CM category code (X02). |
| 7th character | The appropriate 7th character is to be added to each code from category W40 | The appropriate 7th character is to be added to each code from category X02 |
| Includes | — | exposure to fire in fireplace exposure to fire in stove |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources