ICD-10 M65.9
Non-Billable HeaderSynovitis and tenosynovitis, unspecified
About ICD-10-CM M65.9
ICD-10-CM code M65.9 represents Synovitis and tenosynovitis, unspecified. This is a non-billable header code in the Musculoskeletal and Connective Tissue chapter (block M65). The 2026 edition of ICD-10-CM M65.9 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.
Medicare LCD Coverage for M65.9
Local Coverage Determinations (LCDs) from CMS MACs that list M65.9 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 M65.9.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but M65.9 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with M65.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 20610 Joint injection major — knee OA, hip OA, shoulder OA, shoulder impingement, joint pain, meniscal derangement, synovitis, bursitis Orthopedics
- 20605 Joint injection intermediate — hand/wrist OA, synovitis, ganglion cyst, wrist pain, lateral/medial epicondylitis Orthopedics
- 20600 Joint injection small — finger/toe joint OA, trigger finger, synovitis, calcaneal spur, plantar fasciitis, Dupuytren, foot/ankle pain Orthopedics
Convert M65.9 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| M65.9 | 72700 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M65.9
Other codes in section M65-M67 (Disorders of synovium and tendon).
ICD-10 M65.9, Billing FAQ
Is ICD-10 code M65.9 billable? +
No, M65.9 is a non-billable header code. Use a more specific child code from block M65 when submitting claims.
What CPT codes are commonly billed with M65.9? +
Procedures frequently paired with M65.9 include: 20610, 20605, 20600.
What ICD-9 codes does M65.9 map to? +
Per CMS GEMs, M65.9 maps to ICD-9 codes: 72700. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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