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ICD-10-CM 2027 diagnosis code

J11Influenza due to unidentified influenza virus

Not billable — use a more specific code

J11 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About J11

J11 is the ICD-10-CM diagnosis code for influenza due to unidentified influenza virus. It belongs to block J09-J18 (influenza and pneumonia) and chapter 10 (diseases of the respiratory system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: J11.0 (with pneumonia), J11.1 (with other respiratory manifestations), J11.2 (with gastrointestinal manifestations) and J11.8 (with other manifestations).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under J11

Notes that apply from higher levels

Instructions written at a parent level also apply to J11.

Broader instructions also apply from J09-J18 Influenza and pneumonia and Chapter 10: Diseases of the respiratory system.

Codes whose notes reference J11

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about J11

Is J11 billable?

No. J11 is a header code. Report one of its more specific subcodes instead.