T66.XXXD ICD-10-CM Code: Radiation sickness, unspecified, subsequent encounter
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
T66.XXXDRadiation sickness, unspecified, subsequent encounter
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where T66.XXXD sits
- 1
Chapter 19
Injury, poisoning and certain other consequences of external causes (S00-T88)
- 2
Section
Other and unspecified effects of external causes (T66-T78)
- 3
Category T66
Radiation sickness, unspecified
- 4
Code T66.XXXD
Radiation sickness, unspecified, subsequent encounter
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for T66.XXXD.
Code first
No “code first” instruction is listed for T66.XXXD.
Use additional code
No “use additional code” instruction is listed for T66.XXXD.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for T66.XXXD.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for T66.XXXD.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code T66.XXXD mean?
T66.XXXD is the FY 2027 U.S. ICD-10-CM code for “Radiation sickness, unspecified, subsequent encounter.”
Is T66.XXXD a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, T66.XXXD has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is T66.XXXD located in ICD-10-CM?
T66.XXXD is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88), within Other and unspecified effects of external causes (T66-T78) (T66–T78), under category T66, Radiation sickness, unspecified.
What coding notes are listed for T66.XXXD?
No inclusion terms are listed for T66.XXXD in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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