Patient presents with signs and symptoms suggestive of Non-Hodgkin lymphoma (NHL), including painless lymphadenopathy, fatigue, night sweats, unexplained weight loss, and intermittent fever.  Physical examination revealed enlarged lymph nodes in the cervical and axillary regions.  Complete blood count (CBC) demonstrated lymphocytosis.  Comprehensive metabolic panel (CMP) was within normal limits.  Lactate dehydrogenase (LDH) levels were elevated.  Imaging studies, including computed tomography (CT) scan of the chest, abdomen, and pelvis, revealed mediastinal and abdominal lymphadenopathy, confirming the presence of lymphoma.  Biopsy of the affected lymph node was performed and histopathological analysis confirmed the diagnosis of Non-Hodgkin lymphoma, specifically diffuse large B-cell lymphoma (DLBCL).  Immunohistochemistry staining and flow cytometry analysis were consistent with the diagnosis.  Ann Arbor staging indicates Stage II disease.  The patient's International Prognostic Index (IPI) score was calculated to assess prognosis.  Treatment plan includes a combination chemotherapy regimen of R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone).  Patient education was provided regarding the diagnosis, treatment options, potential side effects, and follow-up care.  Referral to oncology and hematology specialists has been initiated for ongoing management.  Patient will be closely monitored for treatment response and potential complications.  ICD-10 code C85.9 Non-Hodgkin lymphoma, unspecified, is documented for billing and coding purposes.