M63: Disorders of muscle in diseases classified elsewhere

Codes under M63 (Disorders of muscle in diseases classified elsewhere). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
M63.8	Disorders of muscle in diseases classified elsewhere	—
M63.80	Disorders of muscle in diseases classified elsewhere, unspecified site	✓
M63.81	Disorders of muscle in diseases classified elsewhere, shoulder	—
M63.82	Disorders of muscle in diseases classified elsewhere, upper arm	—
M63.83	Disorders of muscle in diseases classified elsewhere, forearm	—
M63.84	Disorders of muscle in diseases classified elsewhere, hand	—
M63.85	Disorders of muscle in diseases classified elsewhere, thigh	—
M63.86	Disorders of muscle in diseases classified elsewhere, lower leg	—
M63.87	Disorders of muscle in diseases classified elsewhere, ankle and foot	—
M63.88	Disorders of muscle in diseases classified elsewhere, other site	✓
M63.89	Disorders of muscle in diseases classified elsewhere, multiple sites	✓
M63.811	Disorders of muscle in diseases classified elsewhere, right shoulder	✓
M63.812	Disorders of muscle in diseases classified elsewhere, left shoulder	✓
M63.819	Disorders of muscle in diseases classified elsewhere, unspecified shoulder	✓
M63.821	Disorders of muscle in diseases classified elsewhere, right upper arm	✓
M63.822	Disorders of muscle in diseases classified elsewhere, left upper arm	✓
M63.829	Disorders of muscle in diseases classified elsewhere, unspecified upper arm	✓
M63.831	Disorders of muscle in diseases classified elsewhere, right forearm	✓
M63.832	Disorders of muscle in diseases classified elsewhere, left forearm	✓
M63.839	Disorders of muscle in diseases classified elsewhere, unspecified forearm	✓
M63.841	Disorders of muscle in diseases classified elsewhere, right hand	✓
M63.842	Disorders of muscle in diseases classified elsewhere, left hand	✓
M63.849	Disorders of muscle in diseases classified elsewhere, unspecified hand	✓
M63.851	Disorders of muscle in diseases classified elsewhere, right thigh	✓
M63.852	Disorders of muscle in diseases classified elsewhere, left thigh	✓
M63.859	Disorders of muscle in diseases classified elsewhere, unspecified thigh	✓
M63.861	Disorders of muscle in diseases classified elsewhere, right lower leg	✓
M63.862	Disorders of muscle in diseases classified elsewhere, left lower leg	✓
M63.869	Disorders of muscle in diseases classified elsewhere, unspecified lower leg	✓
M63.871	Disorders of muscle in diseases classified elsewhere, right ankle and foot	✓
M63.872	Disorders of muscle in diseases classified elsewhere, left ankle and foot	✓
M63.879	Disorders of muscle in diseases classified elsewhere, unspecified ankle and foot	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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