2026 ICD-10-CM Diagnosis Code D33.4Benign neoplasm of spinal cord

ICD-10-CM Codes›C00–D49›D10-D36›D33

ICD-10-CM D33.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D33.4 is a billable ICD-10-CM diagnosis code for benign neoplasm of spinal cord. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as benign neoplasm of cauda equina. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D33.4
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of spinal cord
Short Description
Benign neoplasm of spinal cord
Same as the full description in the CMS dataset.
Parent Code
D33
Benign neoplasm of brain and other parts of central nervous system

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD33Benign neoplasm of brain and other parts of central nervous system
This CodeD33.4Benign neoplasm of spinal cord

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of cauda equina
  • Benign neoplasm of extramedullary spinal cord
  • Benign neoplasm of peripheral nerves of trunk
  • Benign neoplasm of soft tissue of back of trunk
  • Benign neoplasm of spinal cord
  • Dermoid cyst of spinal cord
  • Neoplasm of cauda equina
  • Schwannoma of spinal cord

Clinical ClassificationClinical

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

CCSR NEO073
Benign neoplasms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Cauda Equina

    the lower part of the spinal cord consisting of the lumbar, sacral, and coccygeal nerve roots.

  • Cauda Equina Syndrome

    compressive lesion affecting the nerve roots of the cauda equina (e.g., compression, herniation, inflammation, rupture, or stenosis), which controls the function of the bladder and bowel. symptoms may include neurological dysfunction of bladder or bowels, loss of sexual sensation and altered sensation or paralysis in the lower extremities.

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
cauda equinaC72.1C79.49–D33.4D43.4D49.7
conus medullarisC72.0C79.49–D33.4D43.4D49.7
cord (true) (vocal) › spinal (cervical) (lumbar) (thoracic)C72.0C79.49–D33.4D43.4D49.7
filum terminaleC72.0C79.49–D33.4D43.4D49.7
motor tract › cauda equinaC72.1C79.49–D33.4D43.4D49.7
motor tract › spinalC72.0C79.49–D33.4D43.4D49.7
spine, spinal (column) › cord (cervical) (lumbar) (sacral) (thoracic)C72.0C79.49–D33.4D43.4D49.7

Patient EducationClinical

Benign Tumors

Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.

Read the full article at MedlinePlus

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

Convert D33.4 to ICD-9-CMHistory

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

ICD-9-CM
225.3 Benign neo spinal cord
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 D33.4Overview

Is D33.4 a billable code?

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

What is the ICD-9 equivalent of D33.4?

Under the General Equivalence Mappings, benign neoplasm of spinal cord converts to ICD-9-CM 225.3 (benign neo spinal cord). 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.