2026 ICD-10-CM Diagnosis Code M63Disorders of muscle in diseases classified elsewhere
M63 is a non-billable ICD-10-CM category code for disorders of muscle in diseases classified elsewhere, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M63.80, M63.811, M63.812, and M63.819.
Code Identity
Code Classification
Specific Coding for Disorders of muscle in diseases classified elsewhereOverview
Non-specific codes like M63 require more characters. Use one of these billable codes instead:
M63.8 for Disorders of muscle in diseases classified elsewhere
Use M63.80 for Disorders of muscle in diseases classified elsewhere, unspecified site
M63.81 for Disorders of muscle in diseases classified elsewhere, shoulder
M63.82 for Disorders of muscle in diseases classified elsewhere, upper arm
M63.83 for Disorders of muscle in diseases classified elsewhere, forearm
M63.84 for Disorders of muscle in diseases classified elsewhere, hand
M63.85 for Disorders of muscle in diseases classified elsewhere, thigh
M63.86 for Disorders of muscle in diseases classified elsewhere, lower leg
M63.87 for Disorders of muscle in diseases classified elsewhere, ankle and foot
Use M63.88 for Disorders of muscle in diseases classified elsewhere, other site
Use M63.89 for Disorders of muscle in diseases classified elsewhere, multiple sites
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- underlying disease, such as:
- leprosy A30
- neoplasm C49 C79.89 D21 D48.1
- schistosomiasis B65
- trichinellosis B75
Type 1 Excludes
- myopathy in cysticercosis B69.81
- myopathy in endocrine diseases G73.7
- myopathy in metabolic diseases G73.7
- myopathy in sarcoidosis D86.87
- myopathy in secondary syphilis A51.49
- myopathy in syphilis late A52.78
- myopathy in toxoplasmosis B58.82
- myopathy in tuberculosis A18.09
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
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.
Code HistoryHistory
Questions About M63Overview
Is M63 (Disorders of muscle in diseases classified elsewhere) a billable code?
No. This is a category header that groups the codes for disorders of muscle in diseases classified elsewhere, and headers cannot be submitted on claims. Claims for disorders of muscle in diseases classified elsewhere need a more specific code from this category, such as M63.80, M63.811, and M63.812.
