W89 vs Y63.5
W89 (Exposure to man-made visible and ultraviolet light) compared with Y63.5 (Inappropriate temperature in local application and packing), 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. W89 carries an Excludes1 note covering Y63.5: “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
| W89Exposure to man-made visible and ultraviolet light | Y63.5Inappropriate temperature in local application and packing | |
|---|---|---|
| Billing status | Non-billable header Report instead: W89.0XXA, W89.0XXD, W89.0XXS, W89.1XXA, W89.1XXD | Billable |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Exposure to man-made visible and ultraviolet light is a non-billable ICD-10-CM category code (W89). | Inappropriate temperature in local application and packing is a billable ICD-10-CM diagnosis code (Y63.5). |
| 7th character | The appropriate 7th character is to be added to each code from category W89 | — |
| Includes | exposure to welding light (arc) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources