Diseases of myoneural junction and muscle (G70-G73) ICD-10-CM
The G70–G73 section covers diseases of myoneural junction and muscle with 62 ICD-10-CM diagnosis codes, of which 48 are billable in fiscal year 2026. The section is organized into the 4 code ranges listed below.
Code Ranges in This Section 4 ranges · 62 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the G70–G73 Code Range
ICD-10 codes G70-G73 cover diseases affecting the myoneural junction and muscles, including various myopathies and neuromuscular disorders. These codes detail conditions like myasthenia gravis, muscular dystrophies, myotonic disorders, congenital myopathies, and other muscle-related diseases, helping healthcare professionals precisely classify and diagnose these complex disorders.
This ICD-10 range includes G70 for myasthenia gravis and related myoneural disorders, distinguishing between acute exacerbations and remission. Codes such as G71 describe primary muscle disorders like muscular dystrophies, including Duchenne and Becker types, and the facioscapulohumeral form. The chapter also covers myotonic disorders under G71.1, like myotonic muscular dystrophy and drug-induced myotonia. Congenital myopathies and mitochondrial myopathies are categorized under G71.2 and G71.3 respectively, encompassing conditions such as nemaline and centronuclear myopathies. G72 codes encompass other myopathies including drug-induced and alcoholic myopathy, while G73 addresses myoneural junction and muscle disorders secondary to other diseases, such as Lambert-Eaton syndrome related to cancer. Synonyms like "Myasthenic crisis" for G70.01 or "Steinert myotonic dystrophy" for G71.11 help clarify coding choices when alternative terms are encountered.
Questions About This Page
How many codes are in the G70-G73 range?
The G70-G73 range contains 62 ICD-10-CM diagnosis codes in FY 2026. 48 of them are billable, and the rest are category headers that organize the section.
What conditions does G70-G73 cover?
The range covers diseases of myoneural junction and muscle. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
