ICD-9-CM diagnosis code (retired)
049.9 — Unspecified non-arthropod-borne viral diseases of central nervous system
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 049.9
049.9 is an ICD-9-CM diagnosis code for unspecified non-arthropod-borne viral diseases of central nervous system. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 2 ICD-10-CM codes, such as A86 (Unspecified viral encephalitis) and A89 (Unspecified viral infection of central nervous system). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 049.9
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.