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ICD-10-CM category

T66: Radiation sickness, unspecified

3 subcodes · 3 billable · Look up any code with the ICD-10 search

Codes under T66 (Radiation sickness, unspecified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

CodeDescriptionBillable
T66.XXXARadiation sickness, unspecified, initial encounter✓
T66.XXXDRadiation sickness, unspecified, subsequent encounter✓
T66.XXXSRadiation sickness, unspecified, sequela✓

More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees

Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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