Patient presents with symptoms suggestive of hyperinflated lungs, including dyspnea on exertion, chronic cough, and a barrel chest appearance.  Physical examination reveals decreased breath sounds, prolonged expiratory phase, and hyperresonance to percussion.  Pulmonary function testing demonstrates increased total lung capacity (TLC), residual volume (RV), and RV/TLC ratio, consistent with air trapping and hyperinflation.  These findings are indicative of a chronic obstructive pulmonary disease (COPD) exacerbation, likely emphysema, though other causes of hyperinflation such as asthma or cystic fibrosis are being considered in the differential diagnosis.  Patient denies any recent upper respiratory infection or environmental exposures.  Current medications include albuterol as needed.  Treatment plan includes bronchodilator therapy with a short-acting beta-agonist (SABA) and inhaled corticosteroids (ICS), as well as pulmonary rehabilitation referral for breathing exercises and education on disease management.  Oxygen saturation is being monitored, and arterial blood gas (ABG) analysis may be ordered to assess respiratory status and guide further management.  Patient education provided on smoking cessation and importance of medication adherence.  Follow-up scheduled in two weeks to evaluate response to treatment and adjust management as needed.  ICD-10 code J98.4 (Other specified disorders of lung) and relevant CPT codes for evaluation and management (E/M) services, pulmonary function testing, and medication management will be documented for billing purposes.