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J18.9 — Pneumonia, unspecified organism
J18.9
What this code means
Pneumonia is infection and inflammation of the air sacs of the lungs, causing cough, fever and breathlessness.
Also called: pneumonia, lung infection, chest infection.
When this code is used
Used for pneumonia when the organism is not specified.
Where it sits in ICD-10-CM
Code J18.9 belongs to Chapter 10: Diseases of the respiratory system, which covers codes J00–J99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code J18.9?
J18.9 is the ICD-10-CM diagnosis code for “Pneumonia, unspecified organism”. Pneumonia is infection and inflammation of the air sacs of the lungs, causing cough, fever and breathlessness.
When is code J18.9 used?
Used for pneumonia when the organism is not specified. It belongs to Chapter 10 of ICD-10-CM (Diseases of the respiratory system).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.