MCMCB Pro
X39.01XD

X39.01XDExposure to radon, subsequent encounter

Billable / specific codeICD-10-CMPOA exempt

X39.01XD is a billable, specific ICD-10-CM code for exposure to radon, subsequent encounter. It is valid for submission on a claim.

7th character "D" — subsequent encounter

The appropriate 7th character is to be added to each code from category X39

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

X39.01XD does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Related codes at this level

Codes that share X39.01. If X39.01XD is not quite right, the correct code is usually one of these.

Questions about X39.01XD

Is X39.01XD a billable ICD-10-CM code?
Yes. X39.01XD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does X39.01XD sit in the tabular list?
External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.