Patient presents with complaints consistent with low testosterone (low T, male hypogonadism, androgen deficiency).  Symptoms include fatigue, decreased libido, erectile dysfunction, difficulty concentrating, and depressed mood.  Onset of symptoms was gradual over the past six months.  Patient denies any history of pituitary disease, testicular trauma, or use of anabolic steroids.  Physical examination reveals normal testicular size and no gynecomastia.  Laboratory results confirm low serum testosterone levels below the normal reference range (total testosterone, free testosterone).  Differential diagnosis includes primary hypogonadism, secondary hypogonadism, and age-related decline in testosterone.  ICD-10 code E29.1 (Testicular hypofunction) is considered.  Treatment plan includes testosterone replacement therapy (TRT) with intramuscular injections of testosterone cypionate.  Patient education provided regarding the benefits, risks, and side effects of TRT, including monitoring for prostate health.  Follow-up appointment scheduled in four weeks to assess response to therapy and adjust dosage as needed.  Patient advised to maintain a healthy lifestyle with regular exercise and a balanced diet.  Further evaluation may be warranted if symptoms persist or worsen.  Medical necessity for TRT documented and appropriate prior authorizations will be obtained per payer requirements.