T66⚠ Requires 7th Character

Radiation sickness, unspecified

⚠ 7th Character Required

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

This code is not valid for billing without a 7th character. Append one of the following to T66:

Ainitial encounterT66XXXADsubsequent encounterT66XXXDSsequelaT66XXXS

Sub-codes of T66(3)

T66 is a non-billable header. Select a sub-code to bill.

T66ARadiation sickness, unspecified, initial encounter✓ BillableT66DRadiation sickness, unspecified, subsequent encounter✓ BillableT66SRadiation sickness, unspecified, sequela✓ Billable

Also Indexed As(ICD-10-CM Alphabetic Index)

These clinical terms, synonyms, and manifestations all map to T66 in the official ICD-10-CM Alphabetic Index.

Effect, adverse, infrared (radiation) (rays) NOSEffect, adverse, radiation (diagnostic) (infrared) (natural source) (therapeutic) (ultraviolet) (X-ray) NOSEffect, adverse, ultraviolet (radiation) (rays) NOSIrradiation effects, adverseRadiation, effects NOSRadiation, sickness NOSSickness, radiation

✗ Excludes 1(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.-)

Code Hierarchy

┌19Injury, poisoning and certain other consequences of external causes (S00-T88)├T66-T78Other and unspecified effects of external causes (T66-T78)├T66Radiation sickness, unspecified
└T66Radiation sickness, unspecified

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