Alphabetic Index FY2027

J11

Influenza due to unidentified influenza virus

FY2027Chapter 10: Diseases of the respiratory system/J09–J18 Influenza and pneumonia

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

J11 is a non-billable ICD-10-CM code category for influenza due to unidentified influenza virus. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are J11.0 Influenza due to unidentified influenza virus with pneumonia, J11.1 Influenza due to unidentified influenza virus with other respiratory manifestations, J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations and J11.8 Influenza due to unidentified influenza virus with other manifestations. Its coding notes include a Use additional code instruction and 18 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

J09 and J10 are for confirmed cases. If the provider records suspected, possible or probable influenza, J11 is assigned.

Guidelines I.C.10.cInfluenza: identified and unidentified virusesRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (8 notes)
Inherited from J09–J18 Influenza and pneumonia
  • code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)
Inherited from Chapter 10 Diseases of the respiratory system
  • 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)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (18 notes)
Inherited from J09–J18 Influenza and pneumonia
  • 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)
Inherited from Chapter 10 Diseases of the respiratory system
  • 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)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 10 Diseases of the respiratory system
  • 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).

More specific codes under J11 4