2026 ICD-10-CM Diagnosis Code G70.80Lambert-Eaton syndrome, unspecified

ICD-10-CM Codes›G00–G99›G70-G73›G70

ICD-10-CM G70.80
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G70.80 is a billable ICD-10-CM diagnosis code for Lambert-Eaton syndrome, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as eaton Lambert syndrome without underlying malignancy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.

Code Identity

ICD-10-CM Code
G70.80
Billable Status
Yes — Valid for Submission
Code Describes
Lambert-Eaton syndrome, unspecified
Short Description
Lambert-Eaton syndrome, unspecified
Same as the full description in the CMS dataset.
Parent Code
G70.8
Other specified myoneural disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG70-G73Diseases of myoneural junction and muscle
CategoryG70Myasthenia gravis and other myoneural disorders
This CodeG70.80Lambert-Eaton syndrome, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Eaton Lambert syndrome without underlying malignancy
  • Eaton-Lambert syndrome
  • Neuromuscular junction disorder due to Lambert-Eaton syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Lambert-Eaton syndrome NOS

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.

    • Syndrome
      • Lambert-Eaton

Clinical ClassificationClinical

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

CCSR NVS018
Myopathies
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Autoimmune Diseases

Your immune system protects you from disease and infection by attacking germs that get into your body, such as viruses and bacteria. Your immune system can tell that the germs aren't part of you, so it destroys them. If you have an autoimmune disease, your immune system attacks the healthy cells of your organs and tissues by mistake.

The full article covers:

  • What are autoimmune diseases?
  • What causes autoimmune diseases?
  • Who is at risk for autoimmune diseases?
  • What are the symptoms of autoimmune diseases?
  • How are autoimmune diseases diagnosed?
  • What are the treatments for autoimmune diseases?

Read the full article at MedlinePlus

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

Convert G70.80 to ICD-9-CMHistory

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

ICD-9-CM
358.30 Lambert-Eaton synd 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 G70.80Overview

Is G70.80 (Other specified myoneural disorders) a billable code?

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

What is the ICD-9 equivalent of G70.80?

Under the General Equivalence Mappings, Lambert-Eaton syndrome, unspecified converts to ICD-9-CM 358.30 (Lambert-Eaton synd NOS). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.