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ICDMine.com › Browse ICD-10-CM Codes › Ch. 19: Injury, poisoning and certain other consequences of external causes (S00-T88) › Other and unspecified effects of external causes (T66-T78) › T66

T66Radiation sickness, unspecified

ICD-10-CM category (non-billable header) code — part of Other and unspecified effects of external causes (T66-T78)

Code Details

Billable	No — use a more specific child code
Chapter	Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88)
Section	Other and unspecified effects of external causes (T66-T78)
Requires 7th character	Yes

Valid 7th Characters

A	initial encounter
D	subsequent encounter
S	sequela

Coding Notes

Excludes1 (never code both together)

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 Note

The appropriate 7th character is to be added to code T66

Subcategories (3)

T66.XXXA Radiation sickness, unspecified, initial encounter
T66.XXXD Radiation sickness, unspecified, subsequent encounter
T66.XXXS Radiation sickness, unspecified, sequela

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