ICD-10 M35
Non-Billable HeaderOther systemic involvement of connective tissue
About ICD-10-CM M35
ICD-10-CM code M35 represents Other systemic involvement of connective tissue. This is a non-billable header code in the Musculoskeletal and Connective Tissue chapter (block M35). The 2026 edition of ICD-10-CM M35 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 M35. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- reactive perforating collagenosis (L87.1)
Medicare LCD Coverage for M35
Local Coverage Determinations (LCDs) from CMS MACs that list M35 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 M35.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but M35 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with M35
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 M35
Other codes in section M30-M36 (Systemic connective tissue disorders).
ICD-10 M35, Billing FAQ
Is ICD-10 code M35 billable? +
No, M35 is a non-billable header code. Use a more specific child code from block M35 when submitting claims.
What codes are Type 1 Excludes for M35? +
Type 1 Excludes (never code together with M35): reactive perforating collagenosis (L87.1)
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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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