X39: Exposure to other forces of nature
Codes under X39 (Exposure to other forces of nature). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| X39.0 | Exposure to natural radiation | — |
| X39.0 | Exposure to natural radiation | — |
| X39.01 | Exposure to radon | — |
| X39.01 | Exposure to radon | — |
| X39.01XA | Exposure to radon, initial encounter | ✓ |
| X39.01XA | Exposure to radon, initial encounter | ✓ |
| X39.01XD | Exposure to radon, subsequent encounter | ✓ |
| X39.01XD | Exposure to radon, subsequent encounter | ✓ |
| X39.01XS | Exposure to radon, sequela | ✓ |
| X39.01XS | Exposure to radon, sequela | ✓ |
| X39.08 | Exposure to other natural radiation | — |
| X39.08 | Exposure to other natural radiation | — |
| X39.8 | Other exposure to forces of nature | — |
| X39.8 | Other exposure to forces of nature | — |
| X39.08XA | Exposure to other natural radiation, initial encounter | ✓ |
| X39.08XA | Exposure to other natural radiation, initial encounter | ✓ |
| X39.08XD | Exposure to other natural radiation, subsequent encounter | ✓ |
| X39.08XD | Exposure to other natural radiation, subsequent encounter | ✓ |
| X39.08XS | Exposure to other natural radiation, sequela | ✓ |
| X39.08XS | Exposure to other natural radiation, sequela | ✓ |
| X39.8XXA | Other exposure to forces of nature, initial encounter | ✓ |
| X39.8XXA | Other exposure to forces of nature, initial encounter | ✓ |
| X39.8XXD | Other exposure to forces of nature, subsequent encounter | ✓ |
| X39.8XXD | Other exposure to forces of nature, subsequent encounter | ✓ |
| X39.8XXS | Other exposure to forces of nature, sequela | ✓ |
| X39.8XXS | Other exposure to forces of nature, sequela | ✓ |
Frequently asked questions
What is ICD-10-CM code X39?
X39 is an ICD-10-CM category covering Exposure to other forces of nature. It contains 26 more specific diagnosis codes, 18 of which are billable.
Is X39 a billable code?
No — X39 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example X39.0 — Exposure to natural radiation). 18 of the 26 codes under X39 are billable.
What codes fall under X39?
X39 includes X39.0, X39.0, X39.01, X39.01, X39.01XA, plus 21 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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