Convert ICD-9 049.9 to ICD-10

ICD-9 code 049.9, Viral encephalitis NOS, crosswalked to ICD-10 with the official CMS General Equivalence Mappings. Convert another code below.

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Official CMS General Equivalence Mappings Final GEMs release (FY 2018) Maps in both directions

2 candidate ICD-10 mappings for ICD-9 049.9

From the official CMS General Equivalence Mappings. Review each mapping's flags before selecting the final code. Convert another code

ICD-9 code 049.9, "Viral encephalitis NOS", maps to ICD-10 code A86, "Unspecified viral encephalitis". The mapping is flagged approximate: it is the closest available equivalent, not an exact match, so review the clinical documentation when selecting the final code. The GEMs list 2 candidate mappings for this code, because ICD-10 splits it into more specific diagnoses; the documentation decides which one applies. The crosswalk comes from the official CMS General Equivalence Mappings.

ICD‑9 Code

049.9

Viral encephalitis NOS

ICD‑10 Code

A86

Unspecified viral encephalitis

Approximate Flag – This ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option and may not fully capture the original diagnosis.

ICD‑9 Code

049.9

Viral encephalitis NOS

ICD‑10 Code

A89

Unspecified viral infection of central nervous system

Approximate Flag – This ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option and may not fully capture the original diagnosis.

See everything about the source code, including its category, synonyms, and history: open the 049.9 code page → Or run the reverse crosswalk: convert A86 back to ICD-9 →