All ICD10 Codes
T66Billable

Radiation sickness, unspecified

Injury, Poisoning and Certain Other Consequences of External Causes·Other and unspecified effects of external causes (T66-T78)·category·FY 2026

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)

T66-T78 Parent Instructions

Code Also
  • , if applicable, place of occurrence, such as:
  • highway rest stop (Y92.523)
  • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
  • service areas as the place of occurrence of the external cause (Y92.52-)
  • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
  • transport vehicle as the place of occurrence of the external cause (Y92.81-)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • 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.-)

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T66-T78Other and unspecified effects of external causes (T66-T78)
T66Radiation sickness, unspecifiedBillable
T66.XXXARadiation sickness, unspecified, initial encounterBillable
T66.XXXDRadiation sickness, unspecified, subsequent encounterBillable
T66.XXXSRadiation sickness, unspecified, sequelaBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.