2026 ICD-10-CM Diagnosis Code G52.0Disorders of olfactory nerve

ICD-10-CM Codes›G00–G99›G50-G59›G52

ICD-10-CM G52.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G52.0 is a billable ICD-10-CM diagnosis code for disorders of olfactory nerve. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as compression of olfactory nerve. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G52.0
Billable Status
Yes — Valid for Submission
Code Describes
Disorders of olfactory nerve
Short Description
Disorders of olfactory nerve
Same as the full description in the CMS dataset.
Parent Code
G52
Disorders of other cranial nerves

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG52Disorders of other cranial nerves
This CodeG52.0Disorders of olfactory nerve

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Compression of olfactory nerve
  • Cranial nerve compression
  • Disorder of olfactory nerve

Tabular List NotesGuidance

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

Inclusion Terms

  • Disorders of 1st cranial nerve

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.

    • Atrophy, atrophic(of)
      • nerve
        • cranial
          • first (olfactory)
    • Atrophy, atrophic(of)
      • nerve
        • olfactory
    • Compression
      • cranial nerve
        • first
    • Disorder(of)
      • nerve
        • cranial
          • first
    • Disorder(of)
      • nerve
        • olfactory
    • Lesion(s) (nontraumatic)
      • cranial nerve
        • first
    • Neuralgia, neuralgic(acute)
      • nose
    • Neuralgia, neuralgic(acute)
      • olfactory
    • Neuritis(rheumatoid)
      • cranial nerve
        • first or olfactory
    • Neuritis(rheumatoid)
      • olfactory nerve

Clinical ClassificationClinical

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

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G52.0 to ICD-9-CMHistory

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

ICD-9-CM
352.0 Olfactory nerve disorder
Exact Match The mapping is direct, with no qualifiers.

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 G52.0Overview

Is G52.0 (Disorders of other cranial nerves) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorders of olfactory nerve on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G52.0?

Under the General Equivalence Mappings, disorders of olfactory nerve converts to ICD-9-CM 352.0 (olfactory nerve disorder). The mapping is a direct match.

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.