W35 vs Y36
W35 (Explosion and rupture of boiler) compared with Y36 (Operations of war), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. W35 carries an Excludes1 note covering Y36: “exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| W35Explosion and rupture of boiler | Y36Operations of war | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header Report instead: Y36.000A, Y36.000D, Y36.000S, Y36.001A, Y36.001D |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Explosion and rupture of boiler is a non-billable ICD-10-CM category code (W35). | Operations of war is a non-billable ICD-10-CM category code (Y36). |
| 7th character | The appropriate 7th character is to be added to code W35 | The appropriate 7th character is to be added to each code from category Y36 |
| Includes | — | injuries to military personnel and civilians caused by war, civil insurrection, and peacekeeping missions |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources