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	—
X39.01	Exposure to radon	—
X39.01XA	Exposure to radon, initial encounter	✓
X39.01XD	Exposure to radon, subsequent encounter	✓
X39.01XS	Exposure to radon, sequela	✓
X39.08	Exposure to other natural radiation	—
X39.8	Other exposure to forces of nature	—
X39.08XA	Exposure to other natural radiation, initial encounter	✓
X39.08XD	Exposure to other natural radiation, subsequent encounter	✓
X39.08XS	Exposure to other natural radiation, sequela	✓
X39.8XXA	Other exposure to forces of nature, initial encounter	✓
X39.8XXD	Other exposure to forces of nature, subsequent encounter	✓
X39.8XXS	Other exposure to forces of nature, sequela	✓

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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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