Patient presents with symptoms suggestive of a thyroid disorder.  Presenting complaints include fatigue, weight changes, changes in bowel habits, temperature intolerance, mood changes, and alterations in hair and skin texture.  Physical examination findings may include goiter, thyroid nodules, changes in heart rate and rhythm, tremor, and changes in deep tendon reflexes.  Differential diagnosis includes hypothyroidism, hyperthyroidism, thyroiditis, Graves disease, Hashimoto's thyroiditis, thyroid nodules, thyroid cancer, and nonthyroidal illness syndrome.  Laboratory evaluation may include thyroid stimulating hormone (TSH), free T4, free T3, thyroid peroxidase antibodies (TPO antibodies), thyroglobulin antibodies (Tg antibodies), and thyroid ultrasound.  Diagnosis will be based on correlation of patient symptoms, physical exam findings, and laboratory results.  Treatment plan may include thyroid hormone replacement therapy such as levothyroxine for hypothyroidism, antithyroid medications such as methimazole or propylthiouracil for hyperthyroidism, radioactive iodine therapy, or surgical intervention such as thyroidectomy.  Patient education regarding medication management, lifestyle modifications, and potential complications will be provided.  Follow-up appointments will be scheduled to monitor thyroid function and adjust treatment as needed.  ICD-10 codes will be assigned based on the specific diagnosis, and CPT codes will be used for billing based on the procedures and services performed.  Medical necessity for all tests and treatments will be documented.