Nontoxic diffuse goiter

This code represents an enlargement of the thyroid gland that is not caused by inflammation, neoplasm, or hyperthyroidism/hypothyroidism. It is characterized by a uniformly enlarged thyroid without nodules, typically due to iodine deficiency or genetic factors. Patients are usually euthyroid, meaning their thyroid hormone levels are within the normal range.

Use this code when documentation indicates a diffuse, non-nodular enlargement of the thyroid gland in a euthyroid patient. This diagnosis is often made based on physical examination, imaging studies (e.g., ultrasound), and normal thyroid function tests (TSH, T3, T4). It is appropriate for cases where other causes of goiter, such as Graves' disease or Hashimoto's thyroiditis, have been ruled out.

• Ensure documentation explicitly states "diffuse" and "nontoxic" or "euthyroid" to support this code.
• Do not confuse with nodular goiter codes (e.g., E04.1, E04.2) or goiter associated with thyroid dysfunction (e.g., E05.-, E06.-).
• If the cause of the goiter is known (e.g., iodine deficiency), consider coding the underlying cause first, if applicable, although for nontoxic diffuse goiter, the cause is often implied or not explicitly coded separately.