Patient presents with generalized weakness, fatigue, and reduced functional capacity, consistent with a diagnosis of general deconditioning.  Symptoms include decreased endurance, difficulty with activities of daily living (ADLs), and diminished exercise tolerance.  Onset is reported as gradual, following a period of decreased physical activity due to recent hospitalization for pneumonia three weeks prior.  Prior to hospitalization, patient reports independent ambulation and participation in regular exercise.  Physical examination reveals decreased muscle strength in bilateral upper and lower extremities, limited range of motion, and overall diminished physical performance.  No significant cardiac or pulmonary abnormalities were noted on examination.  Assessment supports a diagnosis of general deconditioning secondary to recent illness and reduced mobility.  Plan includes referral to physical therapy for gait training, strengthening exercises, and a graded exercise program to improve functional mobility, endurance, and overall physical conditioning.  Patient education provided regarding the importance of adherence to the prescribed therapy regimen and gradual resumption of activities.  Follow-up scheduled in four weeks to assess progress and modify treatment plan as needed.  ICD-10 code R53.81 (Weakness) and CPT codes for evaluation and management (E/M) services and physical therapy will be used for billing and coding purposes.  Prognosis is favorable with anticipated improvement in functional status with consistent participation in the recommended therapy program.  Differential diagnoses considered included debility, asthenia, and functional decline, however, the patient's history and clinical presentation are most consistent with general deconditioning.