2026 ICD-10-CM Diagnosis Code J11Influenza due to unidentified influenza virus

ICD-10-CM Codes›J00–J99›J09-J18›J11

ICD-10-CM J11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J11 is a non-billable ICD-10-CM category code for influenza due to unidentified influenza virus, so it cannot be submitted on claims. Use a more specific code from this category instead, such as J11.00, J11.08, J11.1, and J11.2.

Code Identity

ICD-10-CM Code
J11
Billable Status
No — Non-Billable Category
Code Describes
Influenza due to unidentified influenza virus
Chapter
J09-J18
Influenza and pneumonia

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ09-J18Influenza and pneumonia
CategoryJ11Influenza due to unidentified influenza virus
This CodeJ11Influenza due to unidentified influenza virus

Specific Coding for Influenza due to unidentified influenza virusOverview

Non-specific codes like J11 require more characters. Use one of these billable codes instead:

  • J11.0 for Influenza due to unidentified influenza virus with pneumonia

  • Use J11.00 for Influenza due to unidentified influenza virus with unspecified type of pneumonia

  • Use J11.08 for Influenza due to unidentified influenza virus with specified pneumonia

  • Use J11.1 for Influenza due to unidentified influenza virus with other respiratory manifestations

  • Use J11.2 for Influenza due to unidentified influenza virus with gastrointestinal manifestations

  • J11.8 for Influenza due to unidentified influenza virus with other manifestations

  • Use J11.81 for Influenza due to unidentified influenza virus with encephalopathy

  • Use J11.82 for Influenza due to unidentified influenza virus with myocarditis

  • Use J11.83 for Influenza due to unidentified influenza virus with otitis media

  • Use J11.89 for Influenza due to unidentified influenza virus with other manifestations

Patient EducationClinical

Flu

The flu, also called influenza, is a respiratory infection caused by viruses. Each year, millions of Americans get sick with the flu. Sometimes it causes mild illness. But it can also be serious or even deadly, especially for people over 65, newborn babies, and people with certain chronic illnesses.

The full article covers:

  • What is the flu?
  • What causes the flu?
  • What are the symptoms of the flu?
  • What other problems can the flu cause?
  • How is the flu diagnosed?
  • What are the treatments for the flu?
  • Can the flu be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J11Overview

Is J11 (Influenza due to unidentified influenza virus) a billable code?

No. This is a category header that groups the codes for influenza due to unidentified influenza virus, and headers cannot be submitted on claims. Claims for influenza due to unidentified influenza virus need a more specific code from this category, such as J11.00, J11.08, and J11.1.