Patient presents with symptoms suggestive of walking pneumonia, also known as atypical pneumonia or Mycoplasma pneumonia.  The patient reports a gradual onset of persistent, dry cough, often described as hacking or unproductive.  Associated symptoms may include malaise, fatigue, low-grade fever, headache, sore throat, and myalgias.  Physical exam may reveal rales or crackles on auscultation, but findings can be minimal.  Differential diagnosis includes bronchitis, influenza, and other respiratory infections.  A chest X-ray may demonstrate interstitial infiltrates, supporting the diagnosis of walking pneumonia.  Laboratory testing, such as a complete blood count (CBC) and polymerase chain reaction (PCR) testing for Mycoplasma pneumoniae, may be performed to confirm the diagnosis.  Treatment typically involves antibiotics, such as macrolides (e.g., azithromycin, erythromycin) or tetracyclines (e.g., doxycycline).  Patient education regarding symptom management, including rest, hydration, and over-the-counter medications for fever and pain relief, is provided.  Follow-up care is recommended to monitor symptom resolution and ensure adequate response to treatment.  ICD-10 code J15.21 (Pneumonia due to Mycoplasma pneumoniae) and relevant CPT codes for evaluation and management (E/M) services, as well as laboratory and radiological procedures, will be documented for billing and coding purposes.