| Full description | Military operations involving unspecified weapon of mass destruction [WMD], subsequent encounter |
| Billable | Yes |
| Chapter | Chapter 20: External causes of morbidity (V00-Y99) |
| Section | Legal intervention, operations of war, military operations, and terrorism (Y35-Y38) |
| Parent code | Y37.91 — Milt op involving unsp weapon of mass destruction |