ICD-10 Code D34 – Benign neoplasm of thyroid gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D34 – Benign neoplasm of thyroid gland
What it is
D34 identifies a noncancerous tumor of the thyroid gland. Use it when documentation clearly states a benign thyroid neoplasm, such as an adenoma, and not a malignant or unspecified thyroid mass.
Clinical signs
Clinical features vary; refer to documentation. Benign thyroid tumors may be found as a thyroid nodule, neck fullness, or an incidental imaging finding, with pathology or specialist assessment confirming benign behavior.
When to use this code
Use D34 when the provider documents a benign neoplasm of the thyroid gland or confirms a benign thyroid adenoma. It is appropriate after biopsy, surgery, or imaging when the final diagnosis is specifically benign. If the record only says “thyroid nodule” or “mass,” check documentation before coding.
Do not use for
Do not use D34 for malignant thyroid neoplasms, thyroiditis, goiter, or an unspecified thyroid nodule without a documented benign diagnosis. Check documentation if the pathology result is missing or unclear.
Coding tip
Code D34 only when the benign thyroid diagnosis is explicit in the chart; otherwise, query for clarification.