T66.XXXS
T66.XXXS: Radiation sickness, unspecified, sequela
Billable / specific codeICD-10-CMPOA exempt
T66.XXXS is a billable, specific ICD-10-CM code for radiation sickness, unspecified, sequela. It is valid for submission on a claim.
Check T66.XXXS with the rest of the claim: free scrubber7th character "S": sequela
The appropriate 7th character is to be added to code T66
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Excludes1 inherited from the categories above T66.XXXS
A category’s note binds every code beneath it.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
T66.XXXS is named in 8 Medicare coverage policies: 8 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A52370Billing and Coding: Bevacizumab and biosimilars
- A55315Billing and Coding: Proton Beam Therapy
- A56612Billing and Coding: CT of the Head
- A56625Billing and Coding: Echocardiography
Code history
Unchanged in every release from FY2024 to FY2027.