M63 – Disorders of muscle in diseases classified elsewhere

ICD-10-CM 2027 diagnosis code · Disorders of muscles

Non-billable header

ICD-10-CM code M63
Code
M63 (claims format: M63)
Description
Disorders of muscle in diseases classified elsewhere
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block
M60-M63 Disorders of muscles

Billable codes under M63

M63 is a header code and cannot be used on claims. Choose the most specific code:

Notes for 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)
  • myopathy in secondary syphilis (A51.49)
  • myopathy in syphilis (late) (A52.78)
  • myopathy in toxoplasmosis (B58.82)
  • myopathy in tuberculosis (A18.09)
Code first:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block M60-M63

Excludes1 (not coded here):
  • dermatopolymyositis (M33.-)
  • myopathy in amyloidosis (E85.-)
  • myopathy in polyarteritis nodosa (M30.0)
  • myopathy in rheumatoid arthritis (M05.32)
  • myopathy in scleroderma (M34.-)
  • myopathy in Sjögren's syndrome (M35.03)
  • myopathy in systemic lupus erythematosus (M32.-)
Excludes2 (not included here):
  • muscular dystrophies and myopathies (G71-G72)

Frequently asked questions

What is ICD-10 code M63?

M63 is the ICD-10-CM code for disorders of muscle in diseases classified elsewhere, in the block M60-M63 (Disorders of muscles).

Is M63 a billable code?

No. M63 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.