2026 ICD-10-CM Diagnosis Code G51.1Geniculate ganglionitis

ICD-10-CM Codes›G00–G99›G50-G59›G51

ICD-10-CM G51.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G51.1 is a billable ICD-10-CM diagnosis code for geniculate ganglionitis. 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
G51.1
Billable Status
Yes — Valid for Submission
Code Describes
Geniculate ganglionitis
Short Description
Geniculate ganglionitis
Same as the full description in the CMS dataset.
Parent Code
G51
Facial nerve disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG51Facial nerve disorders
This CodeG51.1Geniculate ganglionitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Geniculate ganglionitis

Tabular List NotesGuidance

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

Type 1 Excludes

  • postherpetic geniculate ganglionitis B02.21

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.

    • Ganglionitis
      • geniculate
    • Neuralgia, neuralgic(acute)
      • facialis vera
    • Neuritis(rheumatoid)
      • geniculate ganglion
    • Syndrome
      • ganglion (basal ganglia brain)
        • geniculi

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

Facial Injuries and Disorders

Face injuries and disorders can cause pain and affect how you look. In severe cases, they can affect sight, speech, breathing and your ability to swallow. Fractures (broken bones), especially in the bones of your nose, cheekbone and jaw, are common facial injuries.

Read the full article at MedlinePlus

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

Convert G51.1 to ICD-9-CMHistory

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

ICD-9-CM
351.1 Geniculate ganglionitis
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 G51.1Overview

Is G51.1 (Facial nerve disorders) a billable code?

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

What is the ICD-9 equivalent of G51.1?

Under the General Equivalence Mappings, geniculate ganglionitis converts to ICD-9-CM 351.1 (geniculate ganglionitis). 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.