ICD-10 Code S66.401D - Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter

ICD-10-CM Diagnosis Code S66.401D

Diagnosis Code: S66.401D (Raw: S66401D)

Description: Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, 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 S66.401D is designated for Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, 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.