Human metapneumovirus pneumonia

This code identifies pneumonia specifically caused by human metapneumovirus (HMPV). HMPV is a common respiratory virus that can lead to lower respiratory tract infections, particularly in young children, the elderly, and immunocompromised individuals. The infection results in inflammation and fluid accumulation in the lungs, characteristic of pneumonia.

Assign this code when medical record documentation confirms a diagnosis of pneumonia and laboratory testing or clinical assessment identifies human metapneumovirus as the causative agent. This code is appropriate when the provider explicitly states "HMPV pneumonia" or "pneumonia due to human metapneumovirus."

• Ensure documentation clearly specifies HMPV as the etiology; do not assume based on symptoms alone.
• Do not use this code for other viral pneumonias; specific codes exist for influenza, RSV, or other identified viral causes.
• Sequence this code as the primary diagnosis when HMPV pneumonia is the reason for the encounter.