T66 Radiation sickness, unspecified

Excludes1: specified adverse effects of radiation, such as:
burns (T20-T31)
leukemia (C91-C95)
radiation gastroenteritis and colitis (K52.0)
radiation pneumonitis (J70.0)
radiation related disorders of the skin and subcutaneous tissue (L55-L59)
sunburn (L55.-)

7th character: The appropriate 7th character is to be added to code T66
7th character definitions: initial encounter
subsequent encounter
sequela