Patient presents with complaints consistent with terminal ileitis, also known as Crohn's disease of the ileum.  Symptoms include persistent abdominal pain localized to the right lower quadrant, cramping, diarrhea, and unintentional weight loss.  The patient reports increased fatigue and intermittent low-grade fever.  Physical examination reveals tenderness to palpation in the right lower quadrant with no rebound tenderness or guarding.  Bowel sounds are present and active.  Differential diagnoses considered include appendicitis, irritable bowel syndrome, and infectious colitis.  Laboratory studies ordered include complete blood count (CBC), comprehensive metabolic panel (CMP), inflammatory markers such as erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), and stool studies for infectious pathogens.  Imaging studies including abdominal ultrasound and ileocolonoscopy are planned to visualize the terminal ileum and assess for mucosal inflammation, ulcerations, and strictures.  Preliminary diagnosis of terminal ileitis is suspected based on presenting symptoms and clinical findings.  Treatment plan pending further diagnostic evaluation will likely include corticosteroids for inflammation management, immunomodulators, and potentially biologic therapy depending on disease severity.  Dietary modifications, including a low-residue diet, and nutritional counseling will be implemented.  Patient education provided regarding Crohn's disease management, medication adherence, and potential complications.  Follow-up appointment scheduled for review of imaging and laboratory results and to discuss treatment options.  ICD-10 code K50.0 for Crohn's disease of the small intestine will be used pending confirmatory diagnostics.