ICD-10 Code D44 – Neoplasm of uncertain behavior of endocrine glands (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D44 – Neoplasm of uncertain behavior of endocrine glands
What it is
D44 identifies a neoplasm in an endocrine gland whose behavior is uncertain, meaning the pathology cannot clearly label it benign or malignant. Use it when the record documents an endocrine gland tumor with indeterminate behavior.
Clinical signs
Clinical features vary; refer to documentation. These lesions may be discovered on imaging, during surgery, or on pathology, and the key point is uncertain biologic behavior rather than a specific symptom pattern.
When to use this code
Use D44 when the provider documents an endocrine gland neoplasm of uncertain behavior and does not specify a benign or malignant diagnosis. This code fits endocrine organs such as the thyroid, adrenal, pituitary, or parathyroid when the record supports uncertain behavior. If the site or behavior is unclear, check documentation.
Do not use for
Do not use D44 for clearly benign neoplasms, malignant tumors, or metastatic disease. If the chart identifies a specific endocrine gland and a definitive behavior, code that diagnosis instead.
Coding tip
Verify both the gland and the documented behavior; uncertain behavior codes depend on explicit provider or pathology wording.