ICD-10-CM Codes
S00-T88
T66-T78
T66-
2023 ICD-10-CM Diagnosis Code T66.XXXA

2023 ICD-10-CM Diagnosis Code T66.XXXA

Radiation sickness, unspecified, initial encounter

2016

2017

2018

2019

2020

2021

2022

2023

Billable/Specific Code

T66.XXXA is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2023 edition of ICD-10-CM T66.XXXA became effective on October 1, 2022.
This is the American ICD-10-CM version of T66.XXXA - other international versions of ICD-10 T66.XXXA may differ.

The following code(s) above T66.XXXA 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.XXXA:

S00-T88
2023 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
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
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
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

Effect of radiation therapy
Necrosis due to ionizing radiation
Radiation sickness
Radionecrosis
Retinopathy as late effect of radiation
Retinopathy, late effect of radiation

ICD-10-CM T66.XXXA is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):

922 Other injury, poisoning and toxic effect diagnoses with mcc
923 Other injury, poisoning and toxic effect diagnoses without mcc

Convert T66.XXXA 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
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): No change

ICD-10-CM Codes Adjacent To T66.XXXA

T65.92XS …… sequela

T65.93 Toxic effect of unspecified substance, assault

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

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