J11.81: Influenza due to unidentified influenza virus with encephalopathy
J11.81 is the billable ICD-10-CM diagnosis code for Influenza due to unidentified influenza virus with encephalopathy. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code J11.81?
J11.81 is the ICD-10-CM diagnosis code for Influenza due to unidentified influenza virus with encephalopathy. It belongs to category J11 (Influenza due to unidentified influenza virus).
Is J11.81 a billable code?
Yes. J11.81 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does J11.81 belong to?
J11.81 is part of ICD-10-CM category J11 — Influenza due to unidentified influenza virus, which has 16 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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