J18 is the ICD-10 code for Pneumonia, organism unspecified. It is a three-character category divided into 5 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block J09–J18 (Influenza and pneumonia) in Chapter X, Diseases of the respiratory system.
- Code type
- Category (3 characters)
- Chapter
- X · J00–J99
- Classification
- WHO ICD-10, 2019 version
What J18 excludes
Conditions that look similar but belong under another code.
- abscess of lung with pneumonia J85.1
- drug-induced interstitial lung disorders J70.2-J70.4
- pneumonia:
- aspiration (due to): NOS J69.0
- aspiration (due to): anaesthesia during: labour and delivery O74.0
- aspiration (due to): anaesthesia during: pregnancy O29.0
- aspiration (due to): anaesthesia during: puerperium O89.0
- neonatal P24.9
- solids and liquids J69.-
- congenital P23.9
- interstitial NOS J84.9
- lipid J69.1
- usual interstitial J84.1
- pneumonitis, due to external agents J67-J70
Subcodes of J18
J18 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DJ18Lungebetændelse forårsaget af ikke nærmere specificeret mikroorganisme
J18Keuhkokuume, aiheuttava pieneliö määrittämätön
J18Pneumonie, Erreger nicht näher bezeichnet
J18Pneumopathie à micro-organisme non précisé
J18pneumonie, organisme niet-gespecificeerd
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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