J11.81

✓ Billable

Influenza due to unidentified influenza virus with encephalopathy

Diseases of the respiratory system (J00-J99)

Also Known As

Influenzal encephalopathy NOS

✅ No additional coding notes for J11.81

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Code Information

CodeJ11.81

BillableYes

ParentJ11.8

CategoryDiseases of the respiratory system (J00-J99)

Excludes10 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)