ICD-10-CM > V00-Y99 > X30-X39 > X39 > X39.0 X39.0 Exposure to natural radiation Non-Billable/Non-Specific Type 1 Excludes contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123)exposure to man-made radiation (W88-W90)exposure to sunlight (X32) Codes X39.01Exposure to radonX39.01XA..., initial encounterX39.01XD..., subsequent encounterX39.01XS..., sequelaX39.08Exposure to other natural radiationX39.08XA..., initial encounterX39.08XD..., subsequent encounterX39.08XS..., sequela