2026 ICD-10-CM Diagnosis Code G50.9Disorder of trigeminal nerve, unspecified

ICD-10-CM Codes›G00–G99›G50-G59›G50

ICD-10-CM G50.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G50.9 is a billable ICD-10-CM diagnosis code for disorder of trigeminal nerve, 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
G50.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of trigeminal nerve, unspecified
Short Description
Disorder of trigeminal nerve, unspecified
Same as the full description in the CMS dataset.
Parent Code
G50
Disorders of trigeminal nerve

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG50Disorders of trigeminal nerve
This CodeG50.9Disorder of trigeminal nerve, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal innervation syndrome
  • Abnormal nervous system function
  • Dermatosis secondary to peripheral nerve disorder
  • Disorder of left trigeminal nerve
  • Disorder of right trigeminal nerve
  • Fifth cranial nerve abnormal
  • Fifth cranial nerve finding
  • Idiopathic trigeminal neuropathy
  • Inverse Marcus-Gunn phenomenon
  • Jaw-winking syndrome
  • Neurotrophic damage to skin
  • Ophthalmic nerve disorder
  • Paratrigeminal syndrome
  • Second division of fifth cranial nerve disorder
  • Skin damage resulting from acquired nerve disorder
  • Trigeminal nerve disorder
  • Trigeminal nerve sensory disorder
  • Trigeminal trophic syndrome

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.

    • Disorder(of)
      • nerve
        • cranial
          • fifth
    • Disorder(of)
      • nerve
        • trigeminal
    • Lesion(s) (nontraumatic)
      • cranial nerve
        • fifth
    • Lesion(s) (nontraumatic)
      • trigeminal nerve
    • Paralysis, paralytic(complete) (incomplete)
      • nerve
        • trigeminal
    • Paralysis, paralytic(complete) (incomplete)
      • paratrigeminal
    • Paralysis, paralytic(complete) (incomplete)
      • trigeminal 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 G50.9 to ICD-9-CMHistory

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

ICD-9-CM
350.9 Trigeminal nerve dis NOS
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 G50.9Overview

Is G50.9 (Disorders of trigeminal nerve) a billable code?

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

What is the ICD-9 equivalent of G50.9?

Under the General Equivalence Mappings, disorder of trigeminal nerve, unspecified converts to ICD-9-CM 350.9 (trigeminal nerve dis NOS). 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.