Patient presents with left upper quadrant pain (LUQ pain), a symptom complex localized to the left upper abdomen.  Onset, duration, character, and exacerbating or alleviating factors were thoroughly investigated.  Differential diagnosis for LUQ pain includes, but is not limited to, gastritis, gastric ulcer, pancreatitis, splenomegaly, left lower lobe pneumonia, pleurisy, cardiac ischemia, costochondritis, and musculoskeletal pain.  Patient denies any recent trauma.  A detailed review of systems was conducted, including gastrointestinal, cardiovascular, pulmonary, and musculoskeletal systems.  Physical examination, including palpation of the left upper quadrant, auscultation of heart and lungs, and assessment of costochondral junctions, was performed.  Current vital signs were documented.  Based on the patient's presentation, history, and physical exam findings, the following diagnostic tests are being ordered: complete blood count (CBC), comprehensive metabolic panel (CMP), lipase, amylase, electrocardiogram (ECG), and chest x-ray.  Further imaging, such as abdominal ultrasound or CT scan, may be considered based on initial test results.  The patient's pain is being managed conservatively with analgesics and monitoring.  Patient education was provided regarding potential causes of LUQ pain, warning signs of serious conditions, and follow-up instructions.  The patient demonstrates understanding and agrees with the plan of care.  Diagnosis: Left upper quadrant pain (LUQ pain).  Medical coding will be finalized upon completion of diagnostic workup and determination of definitive etiology. This documentation supports medical billing and coding for services rendered.