Patient presents with acute left upper quadrant abdominal pain, possibly consistent with splenic infarct.  Symptoms include sharp, localized pain, potentially radiating to the left shoulder.  Onset may have been sudden or gradual.  Associated symptoms may include nausea, vomiting, low-grade fever, and splenomegaly.  Differential diagnosis includes other causes of abdominal pain such as gastritis, pancreatitis, nephrolithiasis, and pyelonephritis.  Patient history may include risk factors for splenic infarction such as atrial fibrillation, sickle cell disease, hypercoagulable states, left ventricular thrombus, endocarditis, hematologic malignancy, or recent abdominal trauma.  Physical examination reveals localized tenderness to palpation in the left upper quadrant.  Laboratory tests may show leukocytosis and elevated inflammatory markers such as C-reactive protein.  Imaging studies, such as abdominal CT scan with contrast or splenic ultrasound, are crucial for confirming the diagnosis of splenic infarction and assessing the extent of the infarct.  Management focuses on pain control, addressing the underlying cause, and preventing complications.  Treatment may include intravenous fluids, analgesics, anticoagulation therapy if indicated, and close monitoring for potential complications such as abscess formation or splenic rupture.  Patient education regarding symptoms of worsening condition and follow-up care is essential.  ICD-10 code I73.89, other specified peripheral vascular diseases, may be applicable, though a more specific code may be used depending on the underlying cause.  CPT codes for diagnostic imaging and other procedures will be documented as performed.