ICD-9-CM Diagnosis Code 100.81
Diagnosis Code: 100.81 (Raw: 10081)
Description: Leptospiral meningitis (aseptic)
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 100.81 is designated for Leptospiral meningitis (aseptic). While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical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.