2026 ICD-10-CM Diagnosis Code R90.89Other abnormal findings on diagnostic imaging of central nervous system

ICD-10-CM Codes›R00–R99›R90-R94›R90

ICD-10-CM R90.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R90.89 is a billable ICD-10-CM diagnosis code for other abnormal findings on diagnostic imaging of central nervous system. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R90.89
Billable Status
Yes — Valid for Submission
Code Describes
Other abnormal findings on diagnostic imaging of central nervous system
Short Description
Oth abnormal findings on diagnostic imaging of cnsl
Parent Code
R90.8
Other abnormal findings on diagnostic imaging of central nervous system

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR90-R94Abnormal findings on diagnostic imaging and in function studies, without diagnosis
CategoryR90Abnormal findings on diagnostic imaging of central nervous system
This CodeR90.89Other abnormal findings on diagnostic imaging of central nervous system

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • ARIA - amyloid-related imaging abnormality
  • ARIA-E - amyloid-related image abnormality of edema or effusion
  • ARIA-H - amyloid-related image abnormality of microhemorrhage or hemosiderosis
  • Computed tomography of brain abnormal
  • CT of head abnormal
  • Dural tail sign
  • Hyperintense lesion of basal ganglion on focal T2 magnetic resonance imaging
  • Hyperintense lesion of brainstem on focal T2 magnetic resonance imaging
  • Hyperintense lesion of thalamus on focal T2 magnetic resonance imaging
  • Hypointense lesion of basal ganglion on focal T2 magnetic resonance imaging
  • Hypointense lesion of brainstem on focal T2 magnetic resonance imaging
  • Hypointense lesion of thalamus on focal T2 magnetic resonance imaging
  • Imaging of brain abnormal
  • Imaging of central nervous system abnormal
  • Magnetic resonance imaging of brain abnormal
  • Nonconvulsive seizure
  • Tram track sign of optic nerve
  • Vascular hyperintensity of basal ganglia matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of bilateral frontal lobes on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of bilateral occipital lobes on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of bilateral parietal lobes on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of bilateral temporal lobes on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of caudate nucleus matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of caudate nucleus on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of cerebellum on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of frontal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of globus pallidus matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of globus pallidus on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of hippocampus matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of hippocampus on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of left frontal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of left occipital lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of left parietal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of left temporal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of occipital lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of paracentral lobule matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of parietal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of periventricular white matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of pontine matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of putamen matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of putamen on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of red nucleus matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of right frontal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of right occipital lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of right parietal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of right temporal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of temporal lobe on fluid attenuated inversion recovery magnetic resonance imaging
  • Vascular hyperintensity of thalamus matter on transverse relaxation time magnetic resonance imaging
  • Vascular hyperintensity of thalamus on fluid attenuated inversion recovery magnetic resonance imaging

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Other cerebrovascular abnormality found on diagnostic imaging of central nervous system

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.

    • Abnormal, abnormality, abnormalities
      • diagnostic imaging
        • central nervous system NEC
    • Abnormal, abnormality, abnormalities
      • diagnostic imaging
        • cerebrovascular NEC

Clinical ClassificationClinical

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

CCSR SYM017
Abnormal findings without diagnosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert R90.89 to ICD-9-CMHistory

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

ICD-9-CM
793.99 Nonsp abn find-body 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 R90.89Overview

Is R90.89 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other abnormal findings on diagnostic imaging of central nervous system on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R90.89 group to?

When other abnormal findings on diagnostic imaging of central nervous system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R90.89 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the other abnormal findings on diagnostic imaging of central nervous system is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R90.89?

Under the General Equivalence Mappings, other abnormal findings on diagnostic imaging of central nervous system converts to ICD-9-CM 793.99 (nonsp abn find-body NEC). The mapping is approximate, so confirm the match fits the documentation.

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.