ICD-10 Code E06.4 – Drug-induced thyroiditis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E06.4 – Drug-induced thyroiditis
What it is
Drug-induced thyroiditis is inflammation of the thyroid caused by a medication or other drug exposure. You use this code when documentation links thyroid inflammation directly to a drug.
Clinical signs
Clinical features vary; refer to documentation. Patients may have thyroid tenderness, neck discomfort, or symptoms of thyroid dysfunction, but the key point is a documented drug-related cause.
When to use this code
Use E06.4 when the provider states that thyroiditis is caused by a specific medication, drug reaction, or drug exposure. It fits cases where the chart clearly identifies the thyroid inflammation as drug-induced. If the cause is not documented, check documentation before assigning this code.
Do not use for
Do not use this code for thyroiditis with no drug cause documented. It is also not the correct choice for other thyroid disorders, such as hypothyroidism or hyperthyroidism, unless the record specifically identifies drug-induced thyroiditis.
Coding tip
Look for explicit provider wording tying thyroiditis to a drug, and query if the cause is unclear.