M63
Disorders of muscle in diseases classified elsewhere
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
M63 is a non-billable ICD-10-CM code category for disorders of muscle in diseases classified elsewhere. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific code under it is M63.8 Disorders of muscle in diseases classified elsewhere. Its coding notes include a Code first instruction, 15 Excludes1 entries and 11 Excludes2 entries.
Code first
If the underlying condition listed here is present and known, sequence it first.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
This code
Also from chapter/block level (7 notes)
Inherited from M60–M63 Disorders of muscles
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (11 notes)
Inherited from M60–M63 Disorders of muscles
- muscular dystrophies and myopathies (G71-G72)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition