X99 vs Y38
X99 (Assault by sharp object) compared with Y38 (Terrorism), 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. X99 carries an Excludes1 note covering Y38: “injuries due to terrorism (Y38.-)”
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
| X99Assault by sharp object | Y38Terrorism | |
|---|---|---|
| Billing status | Non-billable header Report instead: X99.0XXA, X99.0XXD, X99.0XXS, X99.1XXA, X99.1XXD | Non-billable header Report instead: Y38.0X1A, Y38.0X1D, Y38.0X1S, Y38.0X2A, Y38.0X2D |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Assault by sharp object is a non-billable ICD-10-CM category code (X99). | Terrorism is a non-billable ICD-10-CM category code (Y38). |
| 7th character | The appropriate 7th character is to be added to each code from category X99 | The appropriate 7th character is to be added to each code from category Y38 |
| Includes | homicide injuries inflicted by another person with intent to injure or kill, by any means | These codes are for use to identify injuries resulting from the unlawful use of force or violence against persons or property to intimidate or coerce a Government, the civilian population, or any segment thereof, in furtherance of political or social objective |
| Use additional code | — | code for place of occurrence (Y92.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources