X39.0Exposure to natural radiation

X39.0 is the ICD-10-CM diagnosis code for exposure to natural radiation. It belongs to category X39 (exposure to other forces of nature), block X30-X39 (exposure to forces of nature) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within X39 (exposure to other forces of nature), X39.0 is specifically for exposure to natural radiation. Related codes cover other exposure to forces of nature (X39.8).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Don't report X39.0 together with the conditions in its Excludes1 note: contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123), exposure to man-made radiation (W88-W90) and exposure to sunlight (X32).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.