Patient presents with complaints consistent with restrictive lung disease, including dyspnea, shortness of breath, and reduced exercise tolerance.  Symptoms onset was gradual over [timeframe].  Patient reports a dry cough and denies fever, chills, or sputum production.  Physical exam reveals diminished breath sounds bilaterally, with fine inspiratory crackles at the bases.  Pulmonary function testing demonstrates a restrictive pattern, characterized by reduced forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and total lung capacity (TLC), with a normal or elevated FEV1FVC ratio.  Diffusing capacity of the lungs for carbon monoxide (DLCO) is decreased, suggesting impaired gas exchange.  Arterial blood gas analysis may reveal hypoxemia.  Differential diagnosis includes interstitial lung disease, neuromuscular disorders, obesity hypoventilation syndrome, and chest wall deformities.  Chest imaging, such as high-resolution computed tomography (HRCT) of the chest, is ordered to evaluate for parenchymal abnormalities and further characterize the restrictive process.  Further workup may include pulmonary consultation,  serological testing for connective tissue diseases, and neuromuscular evaluation as clinically indicated.  Initial treatment plan includes supplemental oxygen as needed to maintain oxygen saturation, pulmonary rehabilitation to improve exercise capacity and breathing techniques, and management of underlying conditions contributing to the restrictive lung disease.  Patient education regarding disease process, prognosis, and treatment options was provided. Follow-up is scheduled to review imaging results, discuss further diagnostic testing, and adjust treatment plan as necessary.  ICD-10 code J96.9, Unspecified restrictive lung disease, is provisionally assigned pending further investigation.