Chronic lymphocytic thyroiditis

This code represents an autoimmune disorder where the body's immune system mistakenly attacks the thyroid gland, leading to chronic inflammation. It is characterized by lymphocytic infiltration of the thyroid, often resulting in hypothyroidism over time.

Use this code for patients diagnosed with Hashimoto's thyroiditis or other forms of chronic autoimmune thyroiditis. Documentation should clearly state "chronic lymphocytic thyroiditis," "Hashimoto's thyroiditis," or indicate an autoimmune etiology for thyroid inflammation.

• Do not use this code for acute or subacute forms of thyroiditis; specific codes exist for those conditions.
• Always code any associated hypothyroidism (e.g., 244.9) as a secondary diagnosis, as it is a common consequence.
• Ensure the physician's documentation specifies "chronic" to differentiate from other types of thyroiditis.