W88: Exposure to ionizing radiation

Codes under W88 (Exposure to ionizing radiation). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
W88.0	Exposure to X-rays	—
W88.0XXA	Exposure to X-rays, initial encounter	✓
W88.0XXD	Exposure to X-rays, subsequent encounter	✓
W88.0XXS	Exposure to X-rays, sequela	✓
W88.1	Exposure to radioactive isotopes	—
W88.1XXA	Exposure to radioactive isotopes, initial encounter	✓
W88.1XXD	Exposure to radioactive isotopes, subsequent encounter	✓
W88.1XXS	Exposure to radioactive isotopes, sequela	✓
W88.8	Exposure to other ionizing radiation	—
W88.8XXA	Exposure to other ionizing radiation, initial encounter	✓
W88.8XXD	Exposure to other ionizing radiation, subsequent encounter	✓
W88.8XXS	Exposure to other ionizing radiation, 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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