2027 ICD-10-CM Diagnosis Code M63Disorders of muscle in diseases classified elsewhere

ICD-10-CM Codes›M00–M99›M60-M63›M63

ICD-10-CM M63
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M63 is a non-billable ICD-10-CM category code for disorders of muscle in diseases classified elsewhere, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M63.80, M63.811, M63.812, and M63.819.

Code Identity

ICD-10-CM Code
M63
Billable Status
No — Non-Billable Category
Code Describes
Disorders of muscle in diseases classified elsewhere
Short Description
Disorders of muscle in diseases classified elsewhere
Same as the full description in the CMS dataset.
Chapter
M60-M63
Disorders of muscles

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM60-M63Disorders of muscles
CategoryM63Disorders of muscle in diseases classified elsewhere
This CodeM63Disorders of muscle in diseases classified elsewhere

Specific Coding for Disorders of muscle in diseases classified elsewhereOverview

Non-specific codes like M63 require more characters. Use one of these billable codes instead:

  • M63.8 for Disorders of muscle in diseases classified elsewhere

  • Use M63.80 for Disorders of muscle in diseases classified elsewhere, unspecified site

  • M63.81 for Disorders of muscle in diseases classified elsewhere, shoulder

  • M63.82 for Disorders of muscle in diseases classified elsewhere, upper arm

  • M63.83 for Disorders of muscle in diseases classified elsewhere, forearm

  • M63.84 for Disorders of muscle in diseases classified elsewhere, hand

  • M63.85 for Disorders of muscle in diseases classified elsewhere, thigh

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

  • M63.87 for Disorders of muscle in diseases classified elsewhere, ankle and foot

  • Use M63.88 for Disorders of muscle in diseases classified elsewhere, other site

  • Use M63.89 for Disorders of muscle in diseases classified elsewhere, multiple sites

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M63: its own notes plus those printed at block M60-M63 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On M63 itself
  • 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)
From Block M60-M63 Disorders of muscles applies to 420 codes
  • 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: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block M60-M63 Disorders of muscles applies to 420 codes
  • muscular dystrophies and myopathies (G71-G72)
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • 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)

Code First

The underlying condition named in the note is sequenced before this code.

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M63Overview

What is the ICD-10 code for disorders of muscle in diseases classified elsewhere?

M63 is the ICD-10-CM category for disorders of muscle in diseases classified elsewhere, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is M63 (Disorders of muscle in diseases classified elsewhere) a billable code?

No. This is a category header that groups the codes for disorders of muscle in diseases classified elsewhere, and headers cannot be submitted on claims. Claims for disorders of muscle in diseases classified elsewhere need a more specific code from this category, such as M63.80, M63.811, and M63.812.

Can M63 be reported with B69.81?

Not as a rule. The Excludes1 note on M63 lists "myopathy in cysticercosis (B69.81)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is coded first with M63?

The Code First note reads: underlying disease, such as: leprosy (A30.-); neoplasm (C49.-, C79.89, D21.-, D48.1-); schistosomiasis (B65.-); trichinellosis (B75). When one of these applies, it is sequenced before M63.