A 62-year-old male patient with known emphysema presents to the ER with a chief complaint of shortness of breath. He denies fever, cough, pleurisy, or ill exposures. He continues to smoke cigarettes regularly.

Vital signs show temperature of 99, HR 89 and regular, BP 129/78, and R 22 with pulse oximetry 91% on RA.

The patient has audible wheezes on examination, but lungs are otherwise clear to auscultation and percussion. CXR shows moderate hyperinflation with no acute infiltrate; EKG and labs are unremarkable.

The patient is hospitalized and receives treatment with albuterol and ipratropium nebulizers, supplemental oxygen, and Trimethoprim/Sulfamethoxazole. He is discharged in 48 hours.

Based on the information provided, what is the most accurate documentation for this patient’s primary diagnosis? Click the best answer.