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ICD-10-CM 2027 diagnosis code

J09.XInfluenza due to identified novel influenza A virus

Not billable — use a more specific code

J09.X 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 J09.X

J09.X is the ICD-10-CM diagnosis code for influenza due to identified novel influenza A virus. It belongs to category J09 (influenza due to certain identified influenza viruses), 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: J09.X1 (with pneumonia), J09.X2 (with other respiratory manifestations), J09.X3 (with gastrointestinal manifestations) and J09.X9 (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 J09.X

Coding notes

Applicable toConditions and synonyms classified to this code
  • Avian influenza
  • Bird influenza
  • Influenza A/H5N1
  • Influenza of other animal origin, not bird or swine
  • Swine influenza virus (viruses that normally cause infections in pigs)

Notes that apply from higher levels

Instructions written at a parent level also apply to J09.X.

› From J09 Influenza due to certain identified influenza viruses
Excludes1
  • influenza A/H1N1 (J10.-)
  • influenza due to other identified influenza virus (J10.-)
  • influenza due to unidentified influenza virus (J11.-)
  • seasonal influenza due to other identified influenza virus (J10.-)
  • seasonal influenza due to unidentified influenza virus (J11.-)

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

Codes whose notes reference J09.X

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 J09.X

Is J09.X billable?

No. J09.X is a header code. Report one of its more specific subcodes instead.