ICD-10 Code M66.339 - Spontaneous rupture of flexor tendons, unspecified forearm

ICD-10-CM Diagnosis Code M66.339

Diagnosis Code: M66.339 (Raw: M66339)

Description: Spontaneous rupture of flexor tendons, unspecified forearm

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 M66.339 is designated for Spontaneous rupture of flexor tendons, unspecified forearm. 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.