ICDwise
M63 ⚠ Non-billable

Disorders of muscle in diseases classified elsewhere

ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue

Code
M63
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes1 — never code together
  • 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?
ICD-10-CM code M63 represents Disorders of muscle in diseases classified elsewhere. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M63 billable?
No. M63 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is M63 in?
M63 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.

Related codes in the M63 category

M63.8 Disorders of muscle in diseases classified elsewhere Non-billable M63.80 Disorders of muscle in diseases classified elsewhere, unspecified site Billable M63.81 Disorders of muscle in diseases classified elsewhere, shoulder Non-billable M63.82 Disorders of muscle in diseases classified elsewhere, upper arm Non-billable M63.83 Disorders of muscle in diseases classified elsewhere, forearm Non-billable M63.84 Disorders of muscle in diseases classified elsewhere, hand Non-billable M63.85 Disorders of muscle in diseases classified elsewhere, thigh Non-billable M63.86 Disorders of muscle in diseases classified elsewhere, lower leg Non-billable

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