Patient presents with signs and symptoms suggestive of a lung infiltrate.  Presenting complaints include cough, shortness of breath (dyspnea), chest pain, and possible fever.  On physical examination, the patient may exhibit tachypnea, diminished breath sounds, crackles or rales on auscultation, and potential signs of respiratory distress.  The patient's medical history may include recent respiratory infection, aspiration risk, underlying lung disease such as COPD or asthma, or immunocompromised status.  Differential diagnosis includes pneumonia, pulmonary edema, interstitial lung disease, and lung cancer.  Chest X-ray or CT scan of the chest was ordered to evaluate for the presence, location, and extent of the infiltrate.  Laboratory studies such as complete blood count (CBC) with differential, blood cultures, and inflammatory markers (e.g., CRP, ESR) may be indicated.  Sputum cultures and arterial blood gas analysis may be performed as clinically necessary.  Initial treatment plan includes addressing the underlying cause of the infiltrate, which may involve antibiotics for suspected pneumonia, diuretics for pulmonary edema, or supportive care such as oxygen therapy.  Patient education focuses on medication adherence, respiratory hygiene, and follow-up care.  Further investigation may be warranted based on the clinical course and response to initial treatment. Medical coding will be determined based on the final diagnosis.  Diagnosis of lung infiltrate requires ongoing monitoring and reassessment.