ICD-9-CM Diagnosis Code 801.99
Diagnosis Code: 801.99 (Raw: 80199)
Description: Open fracture of base of skull with intracranial injury of other and unspecified nature, with concussion, unspecified
Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)
Fiscal Year: 2026 Reference
CMS Section 111 Status: Valid for reporting.
Overview & Historical Usage
ICD-9-CM code 801.99 is designated for Open fracture of base of skull with intracranial injury of other and unspecified nature, with concussion, unspecified. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.
