ICD-10 Code S56.399S - Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, sequela

ICD-10-CM Diagnosis Code S56.399S

Diagnosis Code: S56.399S (Raw: S56399S)

Description: Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm 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 S56.399S is designated for Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm 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.