Influenza due to certain identified influenza viruses (J09) ICD-10-CM
The J09 code range covers influenza due to certain identified influenza viruses with 6 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the J09 Range 6 codes · 4 billable
- J09 Influenza due to certain identified influenza virusesNon-billable
- J09.X Influenza due to identified novel influenza A virusNon-billable
- J09.X1 Influenza due to identified novel influenza A virus with pneumonia
- J09.X2 Influenza due to identified novel influenza A virus with other respiratory manifestations
- J09.X3 Influenza due to identified novel influenza A virus with gastrointestinal manifestations
- J09.X9 Influenza due to identified novel influenza A virus with other manifestations
About the J09 Code Range
The ICD-10 code J09 and its subcodes classify influenza caused by certain identified influenza viruses, especially novel influenza A strains. These codes help specify the type and complications of influenza infections for accurate diagnosis and medical documentation.
The ICD-10 code for influenza due to identified novel influenza A virus (J09.X) covers infections by new strains not covered by general flu codes. When influenza presents with pneumonia, coders use J09.X1, which includes pneumonia caused by influenza A virus. Other respiratory symptoms related to these novel influenza infections are documented with J09.X2, capturing various upper respiratory tract infections from influenza A subtypes like H1, H3N2, and H5N1. Influenza with gastrointestinal symptoms, such as gastroenteritis caused by influenza virus, is coded as J09.X3. Finally, influenza complications involving the ear, brain, or spinal cord, including otitis media and encephalopathy, are reported under J09.X9. These detailed codes assist healthcare professionals and medical coders in distinguishing influenza types and their associated clinical manifestations efficiently.
Questions About This Page
How many billable codes are in the J09 range?
Of the 6 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the J09 range classify?
The range classifies influenza due to certain identified influenza viruses. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
