Pneumonia in diseases classified elsewhere

This code signifies pneumonia that arises as a manifestation or complication of another underlying infectious or parasitic disease. It indicates that the pneumonia is not a primary, standalone condition but rather a secondary effect of a systemic illness.

Apply this code when documentation clearly links pneumonia to a specific infectious or parasitic disease that has its own distinct ICD-10-CM code. This typically occurs when the underlying disease is the primary reason for the patient's presentation, and the pneumonia is an associated clinical finding.

• Always sequence the underlying infectious or parasitic disease first, followed by this code.
• Carefully review the "Excludes1" list to ensure the specific type of pneumonia is not explicitly coded elsewhere with its own unique code.
• Documentation must clearly state the causal relationship between the underlying disease and the pneumonia.