ICD-10-CM · Chapter 13 · M00-M99
M63 Disorders of muscle in diseases classified elsewhere
Excludes 1 (cannot be coded together)
- 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
- underlying disease, such as:
- leprosy (A30.-)
- neoplasm (C49.-, C79.89, D21.-, D48.1-)
- schistosomiasis (B65.-)
- trichinellosis (B75)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| M63..8 | Disorders of muscle in diseases classified elsewhere | No |
| M63..80 | Disorders of muscle in diseases classified elsewhere, unspecified site | Yes |
| M63..81 | Disorders of muscle in diseases classified elsewhere, shoulder | No |
| M63..811 | Disorders of muscle in diseases classified elsewhere, right shoulder | Yes |
| M63..812 | Disorders of muscle in diseases classified elsewhere, left shoulder | Yes |
| M63..819 | Disorders of muscle in diseases classified elsewhere, unspecified shoulder | Yes |
| M63..82 | Disorders of muscle in diseases classified elsewhere, upper arm | No |
| M63..821 | Disorders of muscle in diseases classified elsewhere, right upper arm | Yes |
| M63..822 | Disorders of muscle in diseases classified elsewhere, left upper arm | Yes |
| M63..829 | Disorders of muscle in diseases classified elsewhere, unspecified upper arm | Yes |
| M63..83 | Disorders of muscle in diseases classified elsewhere, forearm | No |
| M63..831 | Disorders of muscle in diseases classified elsewhere, right forearm | Yes |
| M63..832 | Disorders of muscle in diseases classified elsewhere, left forearm | Yes |
| M63..839 | Disorders of muscle in diseases classified elsewhere, unspecified forearm | Yes |
| M63..84 | Disorders of muscle in diseases classified elsewhere, hand | No |
| M63..841 | Disorders of muscle in diseases classified elsewhere, right hand | Yes |
| M63..842 | Disorders of muscle in diseases classified elsewhere, left hand | Yes |
| M63..849 | Disorders of muscle in diseases classified elsewhere, unspecified hand | Yes |
| M63..85 | Disorders of muscle in diseases classified elsewhere, thigh | No |
| M63..851 | Disorders of muscle in diseases classified elsewhere, right thigh | Yes |
| M63..852 | Disorders of muscle in diseases classified elsewhere, left thigh | Yes |
| M63..859 | Disorders of muscle in diseases classified elsewhere, unspecified thigh | Yes |
| M63..86 | Disorders of muscle in diseases classified elsewhere, lower leg | No |
| M63..861 | Disorders of muscle in diseases classified elsewhere, right lower leg | Yes |
| M63..862 | Disorders of muscle in diseases classified elsewhere, left lower leg | Yes |
| M63..869 | Disorders of muscle in diseases classified elsewhere, unspecified lower leg | Yes |
| M63..87 | Disorders of muscle in diseases classified elsewhere, ankle and foot | No |
| M63..871 | Disorders of muscle in diseases classified elsewhere, right ankle and foot | Yes |
| M63..872 | Disorders of muscle in diseases classified elsewhere, left ankle and foot | Yes |
| M63..879 | Disorders of muscle in diseases classified elsewhere, unspecified ankle and foot | Yes |
| M63..88 | Disorders of muscle in diseases classified elsewhere, other site | Yes |
| M63..89 | Disorders of muscle in diseases classified elsewhere, multiple sites | Yes |
Last reviewed: September 2026