In simple words: Lung infection (pneumonia) caused by a type of bacteria called streptococcus, but not the most common types.

Pneumonia caused by streptococcal bacteria other than Streptococcus pneumoniae or group B streptococcus.

Example 1: A patient presents with fever, cough, and shortness of breath. A chest X-ray reveals infiltrates consistent with pneumonia. Laboratory tests identify Streptococcus pyogenes as the causative organism., A patient with a history of influenza develops worsening respiratory symptoms. Cultures from sputum samples grow Streptococcus anginosus, indicating a secondary bacterial pneumonia., A patient admitted for a surgical procedure develops post-operative pneumonia. Cultures identify Streptococcus mitis as the infectious agent.

Clinical findings, such as fever, cough, chest pain, and difficulty breathing. Imaging studies (e.g., chest X-ray) showing evidence of pneumonia. Laboratory tests confirming the presence of streptococcal bacteria other than S. pneumoniae or group B strep (e.g., culture, molecular testing).

** For accurate coding, it's crucial to identify the specific type of streptococcus causing the infection. This information is needed to differentiate J15.4 from other pneumonia codes like J13 (pneumonia due to Streptococcus pneumoniae) and J15.3 (pneumonia due to streptococcus, group B).