X39.01XD — Exposure to radon, subsequent encounter
Is X39.01XD billable?
Yes — X39.01XD is billable for FY2027. X39.01XD is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. X39.01XD may be submitted for encounters from October 1, 2026 through September 30, 2027.
X39.01XD at a glance
| Code | X39.01XD |
|---|---|
| Description | Exposure to radon, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in X39.01XD?
In X39.01XD, the 7th character D means subsequent encounter. The 7th character is required for X39.01XD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is X39.01XD listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under X39.01, the nearest indexed parent of X39.01XD. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Forces of nature › radon
- Forces of nature › radiation › radon
- Radiation › natural NEC › radon (exposure to)
Excludes1 — never code together — inherited from X39.0
The conditions below can never be reported together with X39.01XD on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
How long has X39.01XD existed?
X39.01XD has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.