2026 ICD-10-CM Diagnosis Code D44.5Neoplasm of uncertain behavior of pineal gland

ICD-10-CM Codes›C00–D49›D37-D48›D44

ICD-10-CM D44.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D44.5 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of pineal gland. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as neoplasm of uncertain behavior of endocrine glands and nervous system. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neoplasms of unspecified nature or uncertain behavior.

Code Identity

ICD-10-CM Code
D44.5
Billable Status
Yes — Valid for Submission
Code Describes
Neoplasm of uncertain behavior of pineal gland
Short Description
Neoplasm of uncertain behavior of pineal gland
Same as the full description in the CMS dataset.
Parent Code
D44
Neoplasm of uncertain behavior of endocrine glands

Code Classification

ChapterC00–D49Neoplasms
SectionD37-D48Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
CategoryD44Neoplasm of uncertain behavior of endocrine glands
This CodeD44.5Neoplasm of uncertain behavior of pineal gland

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Neoplasm of uncertain behavior of endocrine glands and nervous system
  • Neoplasm of uncertain behavior of pineal gland
  • Pinealoma
  • Pineocytoma

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Pinealoma
    • Pineocytoma

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO072
Neoplasms of unspecified nature or uncertain behavior
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Pinealoma

    neoplasms which originate from pineal parenchymal cells that tend to enlarge the gland and be locally invasive. the two major forms are pineocytoma and the more malignant pineoblastoma. pineocytomas have moderate cellularity and tend to form rosette patterns. pineoblastomas are highly cellular tumors containing small, poorly differentiated cells. these tumors occasionally seed the neuroaxis or cause obstructive hydrocephalus or parinaud's syndrome. germinoma; carcinoma, embryonal; glioma; and other neoplasms may arise in the pineal region with germinoma being the most common pineal region tumor. (from devita et al., cancer: principles and practice of oncology, 5th ed, p2064; adams et al., principles of neurology, 6th ed, p670)

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
pineal (body) (gland)C75.3C79.89D09.3D35.4D44.5D49.7

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D44.5 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
237.1 Unc behav neo pineal
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D44.5Overview

Is D44.5 (Neoplasm of uncertain behavior of endocrine glands) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of pineal gland on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of D44.5?

Under the General Equivalence Mappings, neoplasm of uncertain behavior of pineal gland converts to ICD-9-CM 237.1 (unc behav neo pineal). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.