X39.01XA — Exposure to radon, initial encounter
Is X39.01XA billable?
Yes — X39.01XA is billable for FY2027. X39.01XA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. X39.01XA may be submitted for encounters from October 1, 2026 through September 30, 2027.
X39.01XA at a glance
| Code | X39.01XA |
|---|---|
| Description | Exposure to radon, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in X39.01XA?
In X39.01XA, the 7th character A means initial encounter. The 7th character is required for X39.01XA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is X39.01XA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under X39.01, the nearest indexed parent of X39.01XA. 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 X39.01XA 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 X39.01XA existed?
X39.01XA 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.