2026 ICD-10-CM Diagnosis Code R93.0Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified

ICD-10-CM Codes›R00–R99›R90-R94›R93

ICD-10-CM R93.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R93.0 is a billable ICD-10-CM diagnosis code for abnormal findings on diagnostic imaging of skull and head, not elsewhere classified. 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
R93.0
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified
Short Description
Abnormal findings on dx imaging of skull and head, NEC
Parent Code
R93
Abnormal findings on diagnostic imaging of other body structures

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
CategoryR93Abnormal findings on diagnostic imaging of other body structures
This CodeR93.0Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal findings on diagnostic imaging of skull and head
  • Arthrography abnormal
  • CT of head abnormal
  • Head scan abnormal
  • Imaging of head abnormal
  • MRI of head abnormal
  • Opacity of tooth on plain X-ray
  • Opacity on plain X-ray
  • Plain X-ray of head abnormal
  • Plain X-ray of jaw abnormal
  • Plain X-ray of nasal sinus abnormal
  • Plain X-ray of nose abnormal
  • Plain X-ray of oral soft tissue abnormal
  • Plain X-ray of skull abnormal
  • Plain X-ray of soft tissue abnormal
  • Plain X-ray of soft tissue of face abnormal
  • Plain X-ray of teeth abnormal
  • Plain X-ray of temporomandibular joint abnormal
  • Radiolucency of tooth on plain X-ray

Tabular List NotesGuidance

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

Type 1 Excludes

  • intracranial space-occupying lesion found on diagnostic imaging R90.0

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
        • head
    • Abnormal, abnormality, abnormalities
      • diagnostic imaging
        • skull
    • Cistern, subarachnoid
    • Cyst(colloid) (mucous) (simple) (retention)
      • subarachnoid intrasellar
    • Enlargement, enlarged
      • pituitary fossa
    • Enlargement, enlarged
      • sella turcica
    • Findings, abnormal, inconclusive, without diagnosis
      • pneumoencephalogram
    • Findings, abnormal, inconclusive, without diagnosis
      • radiologic (X-ray)
        • head
    • Findings, abnormal, inconclusive, without diagnosis
      • radiologic (X-ray)
        • skull
    • Findings, abnormal, inconclusive, without diagnosis
      • ventriculogram

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 R93.0 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 R93.0Overview

Is R93.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report abnormal findings on diagnostic imaging of skull and head, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can R93.0 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 skull and head, not elsewhere classified is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R93.0?

Under the General Equivalence Mappings, abnormal findings on diagnostic imaging of skull and head, not elsewhere classified 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.