ICD-10-CM > Z00-Z99 > Z77-Z99 > Z77 > Z77.1 > Z77.12 > Z77.123 Z77.123 Contact with and (suspected) exposure to radon and other naturally occurring radiation Billable/Specific Copy Code Copy Description Type 2 Excludes radiation exposure as the cause of a confirmed condition (W88-W90, X39.0-)radiation sickness NOS (T66)