2026 ICD-10-CM Diagnosis Code R90.0Intracranial space-occupying lesion found on diagnostic imaging of central nervous system

ICD-10-CM Codes›R00–R99›R90-R94›R90

ICD-10-CM R90.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R90.0 is a billable ICD-10-CM diagnosis code for intracranial space-occupying lesion found 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 606 through 607. 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
R90.0
Billable Status
Yes — Valid for Submission
Code Describes
Intracranial space-occupying lesion found on diagnostic imaging of central nervous system
Short Description
Intcrn space-occupying lesion found on dx imaging of cnsl
Parent Code
R90
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 CodeR90.0Intracranial space-occupying lesion 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.

    • Lesion(s) (nontraumatic)
      • intracranial, space-occupying

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 R90.0 to ICD-9-CMHistory

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

ICD-9-CM
784.2 Swelling in head & neck
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 R90.0Overview

Is R90.0 a billable code?

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

What MS-DRG does R90.0 group to?

When intracranial space-occupying lesion found on diagnostic imaging of central nervous system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R90.0 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the intracranial space-occupying lesion found on diagnostic imaging of central nervous system is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R90.0?

Under the General Equivalence Mappings, intracranial space-occupying lesion found on diagnostic imaging of central nervous system converts to ICD-9-CM 784.2 (swelling in head & neck). 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.