ICD-10-CM Diagnosis Code (2025)
Official Description for A81.9
Atypical virus infection of central nervous system, unspecified
Coding Notes & Guidelines for A81.9
Prion diseases of the central nervous system NOS
Parent Code (Less Specific):
About ICD-10-CM Code A81.9 (Atypical virus infection of central nervous system)
ICD-10-CM code A81.9 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM A81.9 became effective on October 1, 2024.
This page provides detailed information about A81.9 - Atypical virus infection of central nervous system, unspecified. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Atypical virus infection of central nervous system related to unspecified.