2026 ICD-10-CM Diagnosis Code R90.82White matter disease, unspecified

ICD-10-CM Codes›R00–R99›R90-R94›R90

ICD-10-CM R90.82
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R90.82 is a billable ICD-10-CM diagnosis code for white matter disease, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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
R90.82
Billable Status
Yes — Valid for Submission
Code Describes
White matter disease, unspecified
Short Description
White matter disease, unspecified
Same as the full description in the CMS dataset.
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 CodeR90.82White matter disease, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • Cerebral degeneration due to neoplastic disease
  • Encephalopathy due to vitamin B12 deficiency
  • Infantile neurodegeneration, progressive spasticity, intellectual disability, white matter lesions syndrome
  • Silent white matter disease due to vascular disease
  • Toxic leukoencephalopathy
  • White matter disease
  • White matter disease due to anti-phospholipid syndrome
  • White matter disease due to microglioma
  • White matter disorder caused by infection
  • White matter disorder co-occurrent and due to cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • White matter disorder due to ischemia
  • White matter disorder due to nutritional deficiency
  • White matter disorder due to vascular abnormality
  • White matter disorder due to vitamin B12 deficiency

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.

    • Disease, diseased
      • white matter

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 R90.82 to ICD-9-CMHistory

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

ICD-9-CM
793.0 Nonsp abn fd-skull/head
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 R90.82Overview

Is R90.82 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report white matter disease, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can R90.82 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the white matter disease, unspecified is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R90.82?

Under the General Equivalence Mappings, white matter disease, unspecified converts to ICD-9-CM 793.0 (nonsp abn fd-skull/head). 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.