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Example of hierarchical organization of ICD-10-CM coding system; this branch of the tree does not have a seventh level.
| Level | Code range or code | Description |
|---|---|---|
| 1 | M00-M99 | Diseases of the musculoskeletal system and connective tissue |
| 2 | M60-M63 | Disorders of muscles |
| 3 | M62 | Other disorders of muscle |
| 4 | M62.8 | Other specified disorders of muscle |
| 5 | M62.83 | Muscle spasm |
| 6 | M62.830 | Muscle spasm of back |
