2026 ICD-10-CM Diagnosis Code R90Abnormal findings on diagnostic imaging of central nervous system

ICD-10-CM Codes›R00–R99›R90-R94›R90

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

R90 is a non-billable ICD-10-CM category code for abnormal findings on diagnostic imaging of central nervous system, so it cannot be submitted on claims. Use a more specific code from this category instead, such as R90.0, R90.81, R90.82, and R90.89. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established.

Code Identity

ICD-10-CM Code
R90
Billable Status
No — Non-Billable Category
Code Describes
Abnormal findings on diagnostic imaging of central nervous system
Short Description
Abnormal findings on diagnostic imaging of cnsl
Chapter
R90-R94
Abnormal findings on diagnostic imaging and in function studies, without diagnosis

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 CodeR90Abnormal findings on diagnostic imaging of central nervous system

Specific Coding for Abnormal findings on diagnostic imaging of cnslOverview

Non-specific codes like R90 require more characters. Use one of these billable codes instead:

  • Use R90.0 for Intracranial space-occupying lesion found on diagnostic imaging of central nervous system

  • R90.8 for Other abnormal findings on diagnostic imaging of central nervous system

  • Use R90.81 for Abnormal echoencephalogram

  • Use R90.82 for White matter disease, unspecified

  • Use R90.89 for Other abnormal findings on diagnostic imaging of central nervous system

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 R90Overview

Is R90 a billable code?

No. This is a category header that groups the codes for abnormal findings on diagnostic imaging of central nervous system, and headers cannot be submitted on claims. Claims for abnormal findings on diagnostic imaging of central nervous system need a more specific code from this category, such as R90.0, R90.81, and R90.82.

Can R90 be a principal diagnosis?

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