Patient presents with signs and symptoms suggestive of hypoparathyroidism.  Presenting complaints may include muscle cramps, tetany, paresthesias, seizures, or fatigue.  Physical examination may reveal Chvostek's sign or Trousseau's sign.  Laboratory findings demonstrate hypocalcemia, hyperphosphatemia, and low parathyroid hormone (PTH) levels.  Differential diagnosis includes pseudohypoparathyroidism, vitamin D deficiency, and renal failure.  Diagnosis of hypoparathyroidism is confirmed based on clinical presentation, low PTH, and low calcium levels.  Treatment plan includes calcium supplementation, vitamin D supplementation (ergocalciferol or cholecalciferol), and monitoring of serum calcium and phosphorus levels.  Patient education provided regarding medication management, dietary adjustments, and the importance of regular follow-up appointments to monitor for potential complications such as nephrocalcinosis or cataracts.  ICD-10 code E20.0 (hypoparathyroidism) is appropriate for this encounter.  Patient's prognosis depends on adherence to treatment and management of potential long-term complications.  Follow-up appointment scheduled to monitor response to therapy and adjust medications as needed.