2020 ICD-10-CM Diagnosis Code J11.81

Influenza due to unidentified influenza virus with encephalopathy

    2016 2017 2018 2019 2020 Billable/Specific Code
  • J11.81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Flu due to unidentified influenza virus w encephalopathy
  • The 2020 edition of ICD-10-CM J11.81 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of J11.81 - other international versions of ICD-10 J11.81 may differ.
Applicable To
  • Influenzal encephalopathy NOS
The following code(s) above J11.81 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to J11.81:
  • J00-J99
    2020 ICD-10-CM Range J00-J99

    Diseases of the respiratory system

    Note
    • When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).
    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • smoke inhalation (T59.81-)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Use Additional
    • code, where applicable, to identify:
    • exposure to environmental tobacco smoke (Z77.22)
    • exposure to tobacco smoke in the perinatal period (P96.81)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Diseases of the respiratory system
  • J09-J18
    2020 ICD-10-CM Range J09-J18

    Influenza and pneumonia

    Type 2 Excludes
    • 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)
    Influenza and pneumonia
Approximate Synonyms
  • Influenza with encephalopathy
ICD-10-CM J11.81 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 865 Viral illness with mcc
  • 866 Viral illness without mcc

Convert J11.81 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to J11.81:
  • Type 1 Excludes: G94
    ICD-10-CM Diagnosis Code G94

    Other disorders of brain in diseases classified elsewhere

      2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
    Code First
    • underlying disease
    Type 1 Excludes
    • encephalopathy in congenital syphilis (A50.49)
    • encephalopathy in influenza (J09.X9, J10.81, J11.81)
    • encephalopathy in syphilis (A52.19)
    • hydrocephalus in diseases classified elsewhere (G91.4)

Diagnosis Index entries containing back-references to J11.81:
  • Influenza (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus) J11.1
    ICD-10-CM Diagnosis Code J11.1

    Influenza due to unidentified influenza virus with other respiratory manifestations

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Influenza NOS
    • Influenzal laryngitis NOS
    • Influenzal pharyngitis NOS
    • Influenza with upper respiratory symptoms NOS
    Use Additional
    • code for associated pleural effusion, if applicable (J91.8)
    • with
      • encephalopathy J11.81

ICD-10-CM Codes Adjacent To J11.81
J10.82 Influenza due to other identified influenza virus with myocarditis
J10.83 Influenza due to other identified influenza virus with otitis media
J10.89 Influenza due to other identified influenza virus with other manifestations
J11 Influenza due to unidentified influenza virus
J11.0 Influenza due to unidentified influenza virus with pneumonia
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
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
J12 Viral pneumonia, not elsewhere classified
J12.0 Adenoviral pneumonia
J12.1 Respiratory syncytial virus pneumonia
J12.2 Parainfluenza virus pneumonia
J12.3 Human metapneumovirus pneumonia
J12.8 Other viral pneumonia
J12.81 Pneumonia due to SARS-associated coronavirus

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.