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ICD-10-CM 2027 diagnosis code

M63.86Disorders of muscle in diseases classified elsewhere, lower leg

Not billable — use a more specific code

M63.86 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.Short description: Disorders of muscle in diseases classd elswhr, lower leg

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 M63.86

M63.86 is the ICD-10-CM diagnosis code for disorders of muscle in diseases classified elsewhere, lower leg. It belongs to category M63 (disorders of muscle in diseases classified elsewhere), 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 3 subcodes must be used instead.

Within M63.8 (disorders of muscle in diseases classified elsewhere), M63.86 is specifically for disorders of muscle in diseases classified elsewhere, lower leg. Related codes cover unspecified site (M63.80), shoulder (M63.81), upper arm (M63.82), forearm (M63.83), hand (M63.84), thigh (M63.85), ankle and foot (M63.87), other site (M63.88) and 1 more.

To report this condition, pick the subcode that matches the documentation: M63.861 (leg), M63.862 (leg) and M63.869 (leg).

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 M63.86

Notes that apply from higher levels

Instructions written at a parent level also apply to M63.86.

› From M63 Disorders of muscle in diseases classified elsewhere
Excludes1
  • 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

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 M63.86

Is M63.86 billable?

No. M63.86 is a header code. Report one of its more specific subcodes instead.