W88.8Exposure to other ionizing radiation

W88.8 is the ICD-10-CM diagnosis code for exposure to other ionizing radiation. It belongs to category W88 (exposure to ionizing radiation), block W85-W99 (exposure to electric current, radiation and extreme ambient air temperature and pressure) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within W88, choose W88.8 (other ionizing radiation) only when documentation doesn't support a more specific option: x-rays (W88.0) and radioactive isotopes (W88.1).

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.

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