ICD-10 Code for Irradiation Effects
The default ICD-10-CM 2027 code for irradiation effects, adverse is T66 – Radiation sickness, unspecified (a header – choose a more specific code). More specific codes depend on the details documented, as listed in the official index (1 codes, 0 billable).
- Main code
T66– Radiation sickness, unspecified- Billable
- No – header code
How to choose the right code
Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.
Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.