W94 vs Y63.2
W94 (Exposure to high and low air pressure and changes in air pressure) compared with Y63.2 (Overdose of radiation given during therapy), 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. W94 carries an Excludes1 note covering Y63.2: “failure in dosage of radiation or temperature during surgical and medical care (Y63.2-Y63.5)”
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
| W94Exposure to high and low air pressure and changes in air pressure | Y63.2Overdose of radiation given during therapy | |
|---|---|---|
| Billing status | Non-billable header Report instead: W94.0XXA, W94.0XXD, W94.0XXS, W94.11XA, W94.11XD | Billable |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Exposure to high and low air pressure and changes in air pressure is a non-billable ICD-10-CM category code (W94). | Overdose of radiation given during therapy is a billable ICD-10-CM diagnosis code (Y63.2). |
| 7th character | The appropriate 7th character is to be added to each code from category W94 | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources