2021 ICD-10-CM Diagnosis Code T66.XXXS

Radiation sickness, unspecified, sequela

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  • T66.XXXS is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM T66.XXXS became effective on October 1, 2020.
  • This is the American ICD-10-CM version of T66.XXXS - other international versions of ICD-10 T66.XXXS may differ.
The following code(s) above T66.XXXS contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to T66.XXXS:
  • S00-T88
    2021 ICD-10-CM Range S00-T88

    Injury, poisoning and certain other consequences of external causes

    Note
    • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
    Type 1 Excludes
    Use Additional
    • code to identify any retained foreign body, if applicable (Z18.-)
    Injury, poisoning and certain other consequences of external causes
  • T66
    ICD-10-CM Diagnosis Code T66

    Radiation sickness, unspecified

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • 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.-)
    Radiation sickness, unspecified
Approximate Synonyms
  • Late effect of radiation
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • T66.XXXS is considered exempt from POA reporting.
ICD-10-CM T66.XXXS is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 922 Other injury, poisoning and toxic effect diagnoses with mcc
  • 923 Other injury, poisoning and toxic effect diagnoses without mcc

Convert T66.XXXS to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To T66.XXXS
T65.93XA …… initial encounter
T65.93XD …… subsequent encounter
T65.93XS …… sequela
T65.94 Toxic effect of unspecified substance, undetermined
T65.94XA …… initial encounter
T65.94XD …… subsequent encounter
T65.94XS …… sequela
T66 Radiation sickness, unspecified
T66.XXXA Radiation sickness, unspecified, initial encounter
T66.XXXD Radiation sickness, unspecified, subsequent encounter
T66.XXXS Radiation sickness, unspecified, sequela
T67 Effects of heat and light
T67.0 Heatstroke and sunstroke
T67.01 Heatstroke and sunstroke
T67.01XA …… initial encounter
T67.01XD …… subsequent encounter
T67.01XS …… sequela
T67.02 Exertional heatstroke
T67.02XA …… initial encounter
T67.02XD …… subsequent encounter
T67.02XS …… sequela

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.