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 2027. 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
Influenza, often called flu, and pneumonia are the focus here. Pneumonia is a lung infection often accompanied by inflammation.
The influenza categories distinguish an identified novel influenza A virus (J09), another identified virus (J10), and an unidentified virus (J11). The latter two split by whether pneumonia, other respiratory problems, gastrointestinal problems, or other manifestations occur.
The pneumonia categories distinguish viral causes (J12), specific bacteria (J13 and J14), and other bacterial causes (J15). Other infectious organisms appear under J16; pneumonia in diseases classified elsewhere appears under J17. When the organism is unspecified, J18 separates descriptions such as bronchopneumonia, lobar pneumonia, and hypostatic pneumonia.
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 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
