J11.81 – Influenza due to unidentified influenza virus with encephalopathy

ICD-10-CM 2027 diagnosis code · Influenza and pneumonia

Billable code

ICD-10-CM code J11.81

Code: J11.81 (claims format: J1181)
Description: Influenza due to unidentified influenza virus with encephalopathy
Short description: Flu due to unidentified influenza virus w encephalopathy
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 10. Diseases of the respiratory system (J00-J99)
Block: J09-J18 Influenza and pneumonia
Parent codes: J11 › J11.8

Notes for J11.81

Applicable to:

Influenzal encephalopathy NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block J09-J18

Excludes2 (not included here):

allergic or eosinophilic pneumonia (J82)
aspiration pneumonia NOS (J69.0)
meconium pneumonia (P24.01)
neonatal aspiration pneumonia (P24.-)
pneumonia due to solids and liquids (J69.-)
congenital pneumonia (P23.9)
lipid pneumonia (J69.1)
rheumatic pneumonia (I00)
ventilator associated pneumonia (J95.851)

Use additional code:

code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)

Index terms for J11.81

Entries in the ICD-10-CM alphabetic index that lead to this code:

Influenza, with, encephalopathy

Related codes in J11.8

Frequently asked questions

What is ICD-10 code J11.81?

J11.81 is the ICD-10-CM code for influenza due to unidentified influenza virus with encephalopathy, in the block J09-J18 (Influenza and pneumonia).

Is J11.81 a billable code?

Yes. J11.81 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does J11.81 belong to?

It belongs to category J11 – Influenza due to unidentified influenza virus.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.