Z77.1 - Contact with and (suspected) exposure to environmental pollution and hazards in the physical environment
Z77.12 - Contact with and (suspected) exposure to hazards in the physical environment
Z77.123 - Contact with and (suspected) exposure to radon and other naturally occuring radiation
Excludes 2:
-radiation exposure as the cause of a confirmed condition (W88-W90,X39.0-)
-radiation sickness NOS (T66)