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ICD-10-CM 2027 diagnosis code

M63Disorders of muscle in diseases classified elsewhere

Not billable — use a more specific code

M63 is a header code, so it can't be reported by itself. Choose one of the 1 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M63

M63 is the ICD-10-CM diagnosis code for disorders of muscle in diseases classified elsewhere. It belongs to block M60-M63 (disorders of muscles) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 1 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M63.8 (elsewhere).

Don't report M63 together with the conditions in its Excludes1 note: myopathy in cysticercosis (B69.81), myopathy in endocrine diseases (G73.7), myopathy in metabolic diseases (G73.7), myopathy in sarcoidosis (D86.87) and 4 more.

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M63

Coding notes

Excludes1Not coded here — never report together with this code
  • 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 firstSequence the underlying condition first

Notes that apply from higher levels

Instructions written at a parent level also apply to M63.

Broader instructions also apply from M60-M63 Disorders of muscles and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M63

Is M63 billable?

No. M63 is a header code. Report one of its more specific subcodes instead.