Disorders of muscles (M60-M63) ICD-10-CM
The M60–M63 section covers disorders of muscles with 556 ICD-10-CM diagnosis codes, of which 420 are billable in fiscal year 2026. The section is organized into the 4 code ranges listed below.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- 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
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Code Ranges in This Section 4 ranges · 556 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M60 | Myositis (M60) | 145 | 111 |
| M61 | Calcification and ossification of muscle (M61) | 203 | 154 |
| M62 | Other disorders of muscle (M62) | 175 | 131 |
| M63 | Disorders of muscle in diseases classified elsewhere (M63) | 33 | 24 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M60–M63 Code Range
ICD-10 codes M60-M63 cover disorders specifically related to muscles, including inflammation, calcification, rupture, wasting, and muscle issues caused by other diseases.
This range includes detailed codes for myositis (M60), such as infective myositis with synonyms like muscle abscess or inflammation of muscle (e.g., M60.002 for upper arm infections). It also specifies myositis ossificans and similar conditions involving abnormal muscle calcification and ossification (M61), distinguishing traumatic causes like myositis ossificans traumatica and progressive conditions. The series addresses nontraumatic muscle ruptures (M62.1), muscle wasting and atrophy (M62.5), including various body sites and specific presentations. Codes such as M62.82 identify rhabdomyolysis, a critical muscle breakdown condition. Lastly, M63 codes are used for muscle disorders associated with other diseases classified elsewhere, helping coders link muscle symptoms to underlying systemic conditions.
These codes provide important specificity regarding muscle disease types and affected locations, facilitating precise medical documentation and supporting accurate diagnosis and treatment planning.
Questions About This Page
How many codes are in the M60-M63 range?
The M60-M63 range contains 556 ICD-10-CM diagnosis codes in FY 2026. 420 of them are billable, and the rest are category headers that organize the section.
What conditions does M60-M63 cover?
The range covers disorders of muscles. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
