ICD-10-CM Diagnosis Code Y99.9
Diagnosis Code: Y99.9 (Raw: Y999)
Description: Unspecified external cause status
Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)
Fiscal Year: 2026
CMS Section 111 Status: Valid for reporting (Excluded from No-Fault liability reporting).
Overview & Clinical Details
ICD-10-CM code Y99.9 is designated for Unspecified external cause status. 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.