Pneumonia due to other infectious organisms, not elsewhere classified (J16) ICD-10-CM
The J16 code range covers pneumonia due to other infectious organisms, not elsewhere classified with 3 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
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 J16 Range 3 codes · 2 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the J16 range.
Chlamydial Pneumonia
Pneumonia caused by infections with the genus CHLAMYDIA; and CHLAMYDOPHILA, usually with CHLAMYDOPHILA PNEUMONIAE.
About the J16 Code Range
ICD-10 code J16 covers pneumonia caused by infectious organisms that do not fit into other specific categories. This includes cases like chlamydial pneumonia (J16.0) and pneumonia due to various other less common infectious agents classified under J16.8.
The ICD-10 code for chlamydial pneumonia (J16.0) is used when the lung infection is caused by bacteria in the Chlamydiaceae family, also known as Chlamydia pneumoniae infection. This code helps distinguish these bacterial pneumonias from others like those caused by tuberculosis or viral agents. Meanwhile, J16.8 covers pneumonia caused by a wide range of other infectious organisms, including parasitic infestations such as pulmonary filariasis or schistosomiasis, fungal lung infections, rickettsial pneumonia, and infestations by specific organisms like Pneumonyssus. By using these codes, healthcare professionals can accurately document pneumonia cases involving less common pathogens, ensuring appropriate diagnosis and treatment tracking.
Questions About This Page
How many billable codes are in the J16 range?
Of the 3 codes in this range, 2 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 J16 range classify?
The range classifies pneumonia due to other infectious organisms, not elsewhere classified. 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.
