Influenza and pneumonia (J09-J18) ICD-10-CM
The J09–J18 section covers influenza and pneumonia with 69 ICD-10-CM diagnosis codes, of which 53 are billable in fiscal year 2026. The section is organized into the 10 code ranges listed below.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code, if applicable, to identify resistance to antimicrobial drugs Z16
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Code Ranges in This Section 10 ranges · 69 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the J09–J18 Code Range
ICD-10 codes J09 through J18 cover a range of diagnoses for influenza and pneumonia, detailing specific virus types, bacterial causes, and complications like pneumonia with or without additional signs. These codes enable precise documentation of respiratory infections caused by various influenza viruses and different kinds of pneumonia.
Within this range, codes beginning with J09 and J10 specify influenza caused by identified novel or other influenza viruses, including subtypes like Influenza A virus and its related respiratory, gastrointestinal, or neurological manifestations. For instance, terms like "pneumonia caused by Influenza A virus" or "Influenza A virus subtype H1N1" link directly to these codes. The J11 series applies when the influenza virus is unidentified but still linked to respiratory symptoms or complications such as pneumonia or encephalopathy. Codes from J12 detail viral pneumonia due to specific viruses such as adenovirus, respiratory syncytial virus, or SARS-associated coronavirus, including COVID-19 pneumonia. The subsequent J13 to J16 codes categorize bacterial pneumonias by causative organisms like Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus (methicillin-sensitive or resistant), and others. Finally, codes in the J17 and J18 range describe pneumonia associated with other conditions or unspecified organisms, covering bronchopneumonia, lobar pneumonia, and hypostatic pneumonia without a clearly identified cause. This comprehensive classification facilitates accurate coding for diverse influenza and pneumonia diagnoses in medical records.
Questions About This Page
How many codes are in the J09-J18 range?
The J09-J18 range contains 69 ICD-10-CM diagnosis codes in FY 2026. 53 of them are billable, and the rest are category headers that organize the section.
What conditions does J09-J18 cover?
The range covers influenza and pneumonia. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
