J70.0 vs T66
J70.0 (Acute pulmonary manifestations due to radiation) compared with T66 (Radiation sickness, unspecified), 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. T66 carries an Excludes1 note covering J70.0: “radiation pneumonitis (J70.0)”
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
| J70.0Acute pulmonary manifestations due to radiation | T66Radiation sickness, unspecified | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | J00-J99 — Diseases of the Respiratory System (J00-J99) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Acute pulmonary manifestations due to radiation is a billable ICD-10-CM diagnosis code (J70.0). | Radiation sickness, unspecified is a non-billable ICD-10-CM category code (T66). |
| 7th character | — | The appropriate 7th character is to be added to code T66 |
| Includes | Radiation pneumonitis | — |
| Use additional code | code (W88-W90, X39.0-) to identify the external cause | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources