ICD-10 Code C75.1 – Malignant neoplasm of pituitary gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C75.1 – Malignant neoplasm of pituitary gland
What it is
This code identifies a malignant tumor arising in the pituitary gland. Use it when documentation states pituitary cancer or malignant neoplasm of the pituitary.
Clinical signs
Clinical features vary; refer to documentation. Pituitary tumors may cause endocrine dysfunction, visual symptoms, or headache, but the coded diagnosis must be confirmed as malignant.
When to use this code
Use C75.1 when the provider documents a malignant neoplasm of the pituitary gland, including a primary cancer at that site. Apply it for encounters focused on diagnosis, staging, monitoring, or management of the malignancy.
If the record only says pituitary mass, adenoma, or unspecified sellar lesion, do not assume malignancy. Check documentation for the exact pathology or provider statement before coding.
Do not use for
Do not use this code for benign pituitary adenoma, pituitary cyst, or uncertain lesions without malignant confirmation. Check documentation if the site is described only as suprasellar or sellar.
Coding tip
Verify the pathology or final provider diagnosis; site alone is not enough to assign C75.1.