J11.81 Influenza due to unidentified influenza virus with encephalopathy

Billable ICD-10-CM code, FY2026.

Applicable to

• Influenzal encephalopathy NOS

MS-DRG index

Defines the logic of DRG(s) 865-866 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 487.8 Influenza with other manifestations (approximate)

Code annotations containing back-references to J11.81

Back-references to J11.81

• Type 1 Excludes: G94 Other disorders of brain in diseases classified elsewhere ("encephalopathy in influenza (J09.X9, J10.81, J11.81)")

Back-references to J11

• Type 1 Excludes: J09 Influenza due to certain identified influenza viruses ("influenza due to unidentified influenza virus (J11.-)")
• Type 1 Excludes: J09 Influenza due to certain identified influenza viruses ("seasonal influenza due to unidentified influenza virus (J11.-)")
• Type 1 Excludes: J10 Influenza due to other identified influenza virus ("influenza due to unidentifed influenza virus (J11.-)")

Diagnosis Index entries for J11.81

• Influenza (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus) › with › encephalopathy

Nearby codes

• J11.00 Influenza due to unidentified influenza virus with unspecified type of pneumonia
• J11.08 Influenza due to unidentified influenza virus with specified pneumonia
• J11.1 Influenza due to unidentified influenza virus with other respiratory manifestations
• J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations
• J11.8 Influenza due to unidentified influenza virus with other manifestations
• J11.81 Influenza due to unidentified influenza virus with encephalopathy (this code)
• J11.82 Influenza due to unidentified influenza virus with myocarditis
• J11.83 Influenza due to unidentified influenza virus with otitis media
• J11.89 Influenza due to unidentified influenza virus with other manifestations