2026 ICD-10-CM Diagnosis Code G71.8Other primary disorders of muscles

ICD-10-CM Codes›G00–G99›G70-G73›G71

ICD-10-CM G71.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G71.8 is a billable ICD-10-CM diagnosis code for other primary disorders of muscles. 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
G71.8
Billable Status
Yes — Valid for Submission
Code Describes
Other primary disorders of muscles
Short Description
Other primary disorders of muscles
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 CodeG71.8Other primary disorders of muscles

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alpha-B crystallin-related late-onset myopathy
  • Amyotrophy caused by herpes zoster
  • Atrophy of tongue
  • Autosomal dominant distal axonal motor neuropathy, myofibrillar myopathy syndrome
  • Autosomal dominant distal hereditary motor neuropathy
  • Benign monomelic amyotrophy
  • Benign monomelic amyotrophy of lower limb
  • Benign monomelic amyotrophy of upper limb
  • Childhood-onset autosomal recessive myopathy with external ophthalmoplegia
  • Chronic intestinal pseudo-obstruction
  • Fatal infantile hypertonic myofibrillar myopathy
  • Hereditary hollow viscus myopathy
  • Hereditary inclusion body myopathy type 4
  • Hereditary myopathy limited to females
  • Hollow visceral myopathy
  • Kyphosis, lateral tongue atrophy, myofibrillar myopathy syndrome
  • Myopathy due to calsequestrin and SERCA1 protein overload
  • Myopathy with cytoplasmic inclusions
  • Proximal myopathy
  • Proximal myopathy with extrapyramidal signs
  • X-linked limb girdle muscular dystrophy with normal dystrophin
  • X-linked muscular dystrophy with limb girdle distribution
  • X-linked myopathy with postural muscle atrophy

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.

    • Amyotrophia, amyotrophy, amyotrophic
    • Myopathy
      • hereditary
        • specified NEC
    • Myopathy
      • primary
        • 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

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 G71.8 to ICD-9-CMHistory

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

ICD-9-CM
359.89 Myopathies 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 G71.8Overview

Is G71.8 (Primary disorders of muscles) a billable code?

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

What is the ICD-9 equivalent of G71.8?

Under the General Equivalence Mappings, other primary disorders of muscles converts to ICD-9-CM 359.89 (myopathies NEC). The mapping is approximate, so confirm the match fits the documentation.

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.