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ICD-10 Code T66.XXXD - Radiation sickness, unspecified, subsequent encounter

Reviewed by Medicinsk Expert•Last updated: 2026-10-22•ICD Codes

ICD-10-CM Diagnosis Code T66.XXXD

Diagnosis Code: T66.XXXD (Raw: T66XXXD)

Description: Radiation sickness, unspecified, subsequent encounter

Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)

Fiscal Year: 2026

CMS Section 111 Status: Valid for reporting.

Overview & Clinical Details

ICD-10-CM code T66.XXXD is designated for Radiation sickness, unspecified, subsequent encounter. In medical documentation and insurance billing, this code is utilized to specify medical diagnosis for patient records, reimbursement workflows, and compliance under CMS Section 111 mandatory insurer reporting guidelines.

Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.