Is X39.01XA a billable ICD-10-CM code?

Yes. X39.01XA is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does X39.01XA sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).

What cannot be coded together with X39.01XA?

X39.01XA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above X39.01XA (X39.0) and apply to it just the same.

X39.01XA

X39.01XA — Exposure to radon, initial encounter

Billable / specific codeICD-10-CMPOA exempt

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

7th character "A" — initial encounter

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above X39.01XA

These are not written on X39.01XA, but they bind it: a note on a category applies to every code beneath it. Billing X39.01XA with anything listed here is a denial.

Written on X39.0 — Exposure to natural radiation

contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123)
exposure to man-made radiation (W88-W90)
exposure to sunlight (X32)

Risk adjustment

X39.01XA 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.

Code history

X39.01XA has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

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

Questions about X39.01XA

Is X39.01XA a billable ICD-10-CM code?: Yes. X39.01XA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does X39.01XA sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).
What cannot be coded together with X39.01XA?: X39.01XA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above X39.01XA (X39.0) and apply to it just the same.