T66

Billable

Radiation sickness, unspecified

T66 is the ICD-10-CM code for Radiation sickness, unspecified. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
S00-T88
Edition
FY2026

S00-T88 Injury, poisoning and certain other consequences of external causes

Excludes1 — not coded here

  • 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.-)

Frequently asked questions

What is ICD-10 code T66?
T66 is the ICD-10-CM code for "Radiation sickness, unspecified". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is T66 a billable code?
Yes — T66 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from T66?
Excludes1 (not coded here): specified adverse effects of radiation, such as:; burns (T20-T31); leukemia (C91-C95); radiation gastroenteritis and colitis (K52.0).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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