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M63

Non-billable

Disorders of muscle in diseases classified elsewhere

M63 is the ICD-10-CM code for Disorders of muscle in diseases classified elsewhere. It is a non-billable category code — use a more specific child code such as M63.8 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
1
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

What this means — in plain language

MedlinePlus · NIH

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. Causes of muscle disorders include: Injury or overuse, such as sprains or strains , cramps or tendinitis A genetic disorder, such as muscular dystrophy Some cancers Inflammation, such as myositis Diseases of…

Read more about Muscle Disorders at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

  • •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)

Code first

  • •underlying disease, such as:
  • •leprosy (A30.-)
  • •neoplasm (C49.-, C79.89, D21.-, D48.1-)
  • •schistosomiasis (B65.-)
  • •trichinellosis (B75)

Frequently asked questions

What is ICD-10 code M63?
M63 is the ICD-10-CM code for "Disorders of muscle in diseases classified elsewhere". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M63 a billable code?
No — M63 is a non-billable header code. Use a more specific child code (such as M63.8) for billing.
What are the subcodes of M63?
M63 has 1 more specific child code, including M63.8.
What is excluded from M63?
Excludes1 (not coded here): myopathy in cysticercosis (B69.81); myopathy in endocrine diseases (G73.7); myopathy in metabolic diseases (G73.7); myopathy in sarcoidosis (D86.87).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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