ICD-10 Code S66.521S - Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela

ICD-10-CM Diagnosis Code S66.521S

Diagnosis Code: S66.521S (Raw: S66521S)

Description: Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela

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 S66.521S is designated for Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela. 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.