2026 ICD-10-CM Diagnosis Code G70.89Other specified myoneural disorders

ICD-10-CM Codes›G00–G99›G70-G73›G70

ICD-10-CM G70.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G70.89 is a billable ICD-10-CM diagnosis code for other specified myoneural disorders. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as dysthymia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.

Code Identity

ICD-10-CM Code
G70.89
Billable Status
Yes — Valid for Submission
Code Describes
Other specified myoneural disorders
Short Description
Other specified myoneural disorders
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 CodeG70.89Other specified myoneural disorders

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dysthymia
  • Generalized neuromuscular exhaustion syndrome
  • Hereditary motor end-plate disease
  • Neuromuscular junction disorder
  • Neuromuscular junction disorder due to Lambert-Eaton syndrome
  • Periodic paralysis
  • Periodic paralysis with transient compartment-like syndrome
  • Slow channel 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)
      • myoneural
        • specified NEC
    • Disorder(of)
      • neuromuscular
        • specified NEC

Clinical ClassificationClinical

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

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

Patient EducationClinical

Neuromuscular Disorders

Neuromuscular disorders affect your neuromuscular system. They can cause problems with:

Read the full article at MedlinePlus

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

Convert G70.89 to ICD-9-CMHistory

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

ICD-9-CM
358.8 Myoneural disorders NEC
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 G70.89Overview

Is G70.89 (Other specified myoneural disorders) a billable code?

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

What is the ICD-9 equivalent of G70.89?

Under the General Equivalence Mappings, other specified myoneural disorders converts to ICD-9-CM 358.8 (myoneural disorders NEC). The mapping is approximate, so confirm the match fits the documentation.

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.