2026 ICD-10-CM Diagnosis Code G71.9Primary disorder of muscle, unspecified

ICD-10-CM Codes›G00–G99›G70-G73›G71

ICD-10-CM G71.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G71.9 is a billable ICD-10-CM diagnosis code for primary disorder of muscle, 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 Myopathies.

Code Identity

ICD-10-CM Code
G71.9
Billable Status
Yes — Valid for Submission
Code Describes
Primary disorder of muscle, unspecified
Short Description
Primary disorder of muscle, unspecified
Same as the full description in the CMS dataset.
Parent Code
G71
Primary disorders of muscles

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG70-G73Diseases of myoneural junction and muscle
CategoryG71Primary disorders of muscles
This CodeG71.9Primary disorder of muscle, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autosomal dominant distal hereditary motor neuropathy
  • Chronic deafness
  • Hereditary fibrosing poikiloderma, tendon contractures, myopathy, pulmonary fibrosis syndrome
  • Hereditary myopathy associated with hydrocephalus
  • Hereditary myopathy with early respiratory failure
  • Hereditary sclerosing poikiloderma
  • Myopathy with cytoplasmic inclusions
  • Peripheral neuropathy, myopathy, hoarseness, hearing loss syndrome
  • Proximal myopathy
  • Tendon contracture
  • X-linked myopathy with excessive autophagy

Tabular List NotesGuidance

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

Inclusion Terms

  • Hereditary myopathy 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.

    • Disorder(of)
      • neuromuscular
        • hereditary NEC
    • Myopathy
      • hereditary
    • Myopathy
      • primary

Clinical ClassificationClinical

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

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

Patient EducationClinical

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Read the full article at MedlinePlus

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

Convert G71.9 to ICD-9-CMHistory

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

ICD-9-CM
359.9 Myopathy 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 G71.9Overview

Is G71.9 (Primary disorders of muscles) a billable code?

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

What is the ICD-9 equivalent of G71.9?

Under the General Equivalence Mappings, primary disorder of muscle, unspecified converts to ICD-9-CM 359.9 (myopathy NOS). 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.