ICD-10 Code D44.5 – Neoplasm of uncertain behavior of pineal gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D44.5 – Neoplasm of uncertain behavior of pineal gland
What it is
D44.5 identifies a pineal gland mass whose behavior is uncertain, meaning the documentation does not confirm whether it is benign or malignant. Use it for lesions specifically described as of uncertain behavior in the pineal region.
Clinical signs
Clinical features vary; refer to documentation. Pineal gland masses may be found on imaging during workup for headaches, hydrocephalus, visual changes, or other neurologic findings, but the code is based on the documented diagnosis, not symptoms alone.
When to use this code
Use D44.5 when the provider documents a neoplasm of uncertain behavior involving the pineal gland and the record does not support a definitive benign or malignant classification. It also fits when pathology or imaging describes an indeterminate pineal lesion and the clinician assigns this diagnosis. Check documentation if the site is only suspected or not clearly stated.
Do not use for
Do not use this code for confirmed malignant neoplasms, benign neoplasms, or cysts of the pineal gland. If the note does not clearly identify uncertain behavior, check documentation before coding.
Coding tip
Verify both the anatomic site and the exact wording “uncertain behavior” before assigning D44.5.