2026 ICD-10-CM Diagnosis Code G52.9Cranial nerve disorder, unspecified

ICD-10-CM Codes›G00–G99›G50-G59›G52

ICD-10-CM G52.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G52.9 is a billable ICD-10-CM diagnosis code for cranial nerve disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G52.9
Billable Status
Yes — Valid for Submission
Code Describes
Cranial nerve disorder, unspecified
Short Description
Cranial nerve disorder, unspecified
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 CodeG52.9Cranial nerve disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Combined hyperactive dysfunction syndrome of cranial nerves
  • Cranial nerve disorder
  • Cranial nerve palsy due to diabetes mellitus
  • Cranial nerve palsy due to type 1 diabetes mellitus
  • Cranial neuralgia
  • Cranial neuritis
  • Cranial neuropathy due to micronutrient deficiency
  • Cranial neuropathy due to petrous infection
  • Cranial neuropathy due to sinusitis
  • Disorder of cranial nerve caused by ionizing radiation
  • Disorder of nerve due to type 1 diabetes mellitus
  • Fungal infection of cranial nerve
  • Fungal neuritis
  • Infection of cranial nerve caused by bacterium
  • Microvascular cranial nerve palsy
  • Neuropathy caused by ionizing radiation
  • Viral infection of 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
    • Compression
      • cranial nerve
    • Disease, diseased
      • cranial nerve NOS
    • Disorder(of)
      • nerve
        • cranial
    • Lesion(s) (nontraumatic)
      • cranial nerve
    • Lesion(s) (nontraumatic)
      • cranial nerve
        • eleventh
    • Paralysis, paralytic(complete) (incomplete)
      • cranial or cerebral nerve
    • Paralysis, paralytic(complete) (incomplete)
      • nerve
        • cranial or cerebral

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 G52.9 to ICD-9-CMHistory

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

ICD-9-CM
352.9 Cranial nerve dis NOS
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 G52.9Overview

Is G52.9 (Disorders of other cranial nerves) a billable code?

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

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

Under the General Equivalence Mappings, cranial nerve disorder, unspecified converts to ICD-9-CM 352.9 (cranial nerve dis NOS). 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.