X17 vs X30
X17 (Contact with hot engines, machinery and tools) compared with X30 (Exposure to excessive natural heat), 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. X17 carries an Excludes1 note covering X30: “exposure to excessive natural heat (X30)”
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
| X17Contact with hot engines, machinery and tools | X30Exposure to excessive natural heat | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Contact with hot engines, machinery and tools is a non-billable ICD-10-CM category code (X17). | Exposure to excessive natural heat is a non-billable ICD-10-CM category code (X30). |
| 7th character | The appropriate 7th character is to be added to code X17 | The appropriate 7th character is to be added to code X30 |
| Includes | — | Exposure to excessive heat as the cause of sunstroke Exposure to heat NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources