ICD-10 Code S66.099D - Other specified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter

ICD-10-CM Diagnosis Code S66.099D

Diagnosis Code: S66.099D (Raw: S66099D)

Description: Other specified injury of long flexor muscle, fascia and tendon of unspecified 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 S66.099D is designated for Other specified injury of long flexor muscle, fascia and tendon of unspecified 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.