J18 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Pneumonia, unspecified organism.
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If applicable, any associated condition such as:
Aspiration pneumonia (J69.-)
Abscess of lung with pneumonia (J85.1)
Aspiration pneumonia due to anesthesia during labor and delivery (O74.0)
Aspiration pneumonia due to anesthesia during pregnancy (O29)
Aspiration pneumonia due to anesthesia during puerperium (O89.0)
Aspiration pneumonia due to solids and liquids (J69.-)
Aspiration pneumonia NOS (J69.0)
Lipid pneumonia (J69.1)
Pneumonitis due to external agents (J67-J70)
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