2026 ICD-10-CM Diagnosis Code D43.8Neoplasm of uncertain behavior of other specified parts of central nervous system

ICD-10-CM Codes›C00–D49›D37-D48›D43

ICD-10-CM D43.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D43.8 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of other specified parts of central nervous system. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neoplasms of unspecified nature or uncertain behavior.

Code Identity

ICD-10-CM Code
D43.8
Billable Status
Yes — Valid for Submission
Code Describes
Neoplasm of uncertain behavior of other specified parts of central nervous system
Short Description
Neoplasm of uncertain behavior of prt central nervous system
Parent Code
D43
Neoplasm of uncertain behavior of brain and central nervous system

Code Classification

ChapterC00–D49Neoplasms
SectionD37-D48Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
CategoryD43Neoplasm of uncertain behavior of brain and central nervous system
This CodeD43.8Neoplasm of uncertain behavior of other specified parts of central nervous system

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

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
nervous system (central) › specified site NEC–C79.49–D33.7D43.8–
parasellarC72.9C79.49–D33.9D43.8D49.7

Patient EducationClinical

Neurologic Diseases

The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood.

Read the full article at MedlinePlus

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

Convert D43.8 to ICD-9-CMHistory

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

ICD-9-CM
237.9 Unc beh neo nerv sys NEC
Approximate The match is approximate rather than exact.

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 D43.8Overview

Is D43.8 a billable code?

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

What is the ICD-9 equivalent of D43.8?

Under the General Equivalence Mappings, neoplasm of uncertain behavior of other specified parts of central nervous system converts to ICD-9-CM 237.9 (unc beh neo nerv sys NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.