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

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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