When is ICD-10 code D43 used?

Doctors, hospitals, and insurers may use ICD-10 code D43 when recording neoplasm of uncertain behavior of brain and central nervous system in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code D43 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code D43: Neoplasm of uncertain behavior of brain and central nervous system

Name: ICD-10 Code D43: Neoplasm of uncertain behavior of brain and central nervous system
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:04:07.858Z

D43 is an ICD-10 diagnosis entry used to group records related to Neoplasm of uncertain behavior of brain and central nervous system. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).

When is it used?

May be used when a clinician documents neoplasm of uncertain behavior of brain and central nervous system in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

2Neoplasms (C00-D49)

block

D37-D48Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes

currentD37-D48

Official coding notes

Excludes1 (do not code together)

neoplasm of uncertain behavior of peripheral nerves and autonomic nervous system (D48.2)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

OncologistGeneral PhysicianNeurologist

Sibling codes

D3ABenign neuroendocrine tumors (D3A)

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

D43

Replacement codes

D43.0 — Neoplasm of uncertain behavior of brain, supratentorialD43.1 — Neoplasm of uncertain behavior of brain, infratentorialD43.2 — Neoplasm of uncertain behavior of brain, unspecifiedD43.3 — Neoplasm of uncertain behavior of cranial nervesD43.4 — Neoplasm of uncertain behavior of spinal cordD43.8 — Neoplasm of uncertain behavior of other specified parts of central nervous systemD43.9 — Neoplasm of uncertain behavior of central nervous system, unspecified

Common synonyms

Neoplasm of uncertain behavior of brain and central nervous system

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.