Pneumonia due to other Gram-negative bacteria

This diagnosis code signifies an acute inflammatory condition of the lung parenchyma, specifically pneumonia, caused by Gram-negative bacterial pathogens other than those explicitly classified elsewhere (e.g., Klebsiella pneumoniae, Pseudomonas aeruginosa). It indicates a bacterial infection leading to lung consolidation, often presenting with fever, cough, and dyspnea.

Apply this code when documentation confirms pneumonia and laboratory testing identifies a Gram-negative bacterium as the causative agent, but the specific organism is not Klebsiella pneumoniae, Pseudomonas aeruginosa, or another bacterium with a more specific code. This is appropriate for cases where the Gram-negative pathogen is identified as, for example, Enterobacter species, Serratia marcescens, or Proteus mirabilis.

• Ensure the medical record clearly states "pneumonia" and identifies the causative agent as a Gram-negative bacterium not otherwise specified.
• Avoid using this code if a more specific Gram-negative bacterial pneumonia code (e.g., for Klebsiella or Pseudomonas) is available and documented.
• Always sequence this code after the primary diagnosis if the pneumonia is a complication of another underlying condition.