ICD-10 Code D35.1 – Benign neoplasm of parathyroid gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D35.1 – Benign neoplasm of parathyroid gland
What it is
D35.1 identifies a noncancerous tumor of the parathyroid gland. Use it when documentation states a benign parathyroid neoplasm, adenoma, or similar benign growth.
Clinical signs
Clinical features vary; refer to documentation. Benign parathyroid tumors are often found during evaluation for hyperparathyroidism, abnormal calcium findings, or an incidental neck mass.
When to use this code
Use D35.1 when the provider documents a benign neoplasm of a parathyroid gland, including a parathyroid adenoma. It may also apply when pathology confirms a benign parathyroid tumor. If the record only mentions elevated calcium or hyperparathyroidism without a tumor diagnosis, check documentation.
Do not use for
Do not use this code for malignant parathyroid tumors or unspecified parathyroid disease. It is also incorrect for hyperparathyroidism without documented benign neoplasm.
Coding tip
Confirm the site and benign nature in the pathology or provider note before assigning D35.1.