Neoplasm of unspecified nature of brain

This code signifies the presence of a brain tumor whose benign or malignant nature has not yet been definitively determined through pathological examination or further diagnostic workup. It indicates an intracranial mass requiring further investigation to establish its specific characteristics.

This code is appropriate when imaging studies (e.g., MRI, CT scan) reveal a brain lesion or mass, but a biopsy or definitive pathological diagnosis is pending or inconclusive. It should be used when the physician's documentation explicitly states "neoplasm of uncertain behavior," "brain mass, nature undetermined," or similar phrasing indicating an unconfirmed diagnosis.

• Avoid using this code if the pathology report definitively identifies the tumor as benign or malignant; instead, code to the specific type.
• This code is often a temporary diagnosis while awaiting further diagnostic results.
• Do not use for symptoms of a brain tumor without imaging evidence of a mass.