Is ICD-10-CM code M63 billable?

No, M63 (Disorders of muscle in diseases classified elsewhere) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code M63 belong to?

M63 belongs to Chapter 13 of the ICD-10-CM tabular list: M00–M99 (Diseases of the Musculoskeletal System and Connective Tissue).

M63Not billable, use a more specific code below

Disorders of muscle in diseases classified elsewhere

In Disorders of muscles (M60-M63), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

24 billable codes under M63: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different 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 first: code the underlying condition first, then this code

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

Also applies, from Disorders of muscles (M60-M63)

These notes sit on M60-M63 and apply to every code under it, including M63.

Excludes1: not coded here, use a different code

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, code separately if applicable

muscular dystrophies and myopathies (G71-G72)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Site and laterality (page 60)
Acute traumatic versus chronic or recurrent musculoskeletal conditions (page 61)
Coding of Pathologic Fractures (page 61)
Osteoporosis (page 61)
Multisystem Inflammatory Syndrome (page 62)

Read Section I.C.13 (page 60)

All codes under M63

M63 can't be used on a claim. Pick a billable code below; grey headings group them.

M63 MS-DRGs

As the principal diagnosis, all 24 billable codes under M63 group to MS-DRG 557 or 558 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.