ICD-10 M63
Non-Billable HeaderDisorders of muscle in diseases classified elsewhere
About ICD-10-CM M63
ICD-10-CM code M63 represents Disorders of muscle in diseases classified elsewhere. This is a non-billable header code in the Musculoskeletal and Connective Tissue chapter (block M63). The 2026 edition of ICD-10-CM M63 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 1 Excludes
Pure excludes, these codes can never be coded together with M63. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- 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)
Coding Notes
Code First
- underlying disease, such as:
- leprosy (A30.-)
- neoplasm (C49.-, C79.89, D21.-, D48.1-)
- schistosomiasis (B65.-)
- trichinellosis (B75)
Medicare LCD Coverage for M63
Local Coverage Determinations (LCDs) from CMS MACs that list M63 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M63.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but M63 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with M63
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To M63
Other codes in section M60-M63 (Disorders of muscles).
ICD-10 M63, Billing FAQ
Is ICD-10 code M63 billable? +
No, M63 is a non-billable header code. Use a more specific child code from block M63 when submitting claims.
What codes are Type 1 Excludes for M63? +
Type 1 Excludes (never code together with M63): myopathy in cysticercosis (B69.81); myopathy in endocrine diseases (G73.7); myopathy in metabolic diseases (G73.7)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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