Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesDisorders of synovium and tendonICD-10-CM m66-spontaneous-rupture-of-synovium-and-tendon
    Ask Trek AI about this page

    ICD-10-CM Code For Spontaneous Rupture Of Synovium And Tendon: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group M66 includes spontaneous rupture of synovium and tendon conditions such as nonspecific tendon ruptures and ruptures associated with synovial pathology affecting joint function. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving acute or chronic tendon disruption, extensor or flexor mechanism failure, or synovial degeneration leading to tendon rupture, capturing disease severity and anatomical involvement. Accurate coding within the ICD-10-CM M66 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Spontaneous Rupture Of Synovium And Tendon: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM M66: Spontaneous Rupture Of Synovium And Tendon Overview

    The diagnoses in this group represent spontaneous ruptures of the synovium and tendons, affecting joint function and soft tissue integrity. These conditions target the musculoskeletal system, particularly periarticular structures and tendinous tissues. Accurate coding matters for reimbursement because it reflects the acuity and complexity of musculoskeletal injuries and supports appropriate claim processing.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when clinical documentation indicates a spontaneous rupture of a tendon or rupture related to synovial pathology rather than traumatic avulsion or laceration. Select codes that specify the affected tendon, laterality, and any associated synovial involvement when provided in the medical record.

    ICD-10-CM Codes

    103 rows

    ICD-10-CM CodeDescription
    M66.0Rupture of popliteal cyst
    M66.10Rupture of synovium, unspecified joint
    M66.111Rupture of synovium, right shoulder
    M66.112Rupture of synovium, left shoulder
    M66.119Rupture of synovium, unspecified shoulder
    M66.121Rupture of synovium, right elbow
    M66.122Rupture of synovium, left elbow
    M66.129Rupture of synovium, unspecified elbow
    M66.131Rupture of synovium, right wrist
    M66.132Rupture of synovium, left wrist
    M66.139Rupture of synovium, unspecified wrist
    M66.141Rupture of synovium, right hand
    M66.142Rupture of synovium, left hand
    M66.143Rupture of synovium, unspecified hand
    M66.144Rupture of synovium, right finger(s)
    M66.145Rupture of synovium, left finger(s)
    M66.146Rupture of synovium, unspecified finger(s)
    M66.151Rupture of synovium, right hip
    M66.152Rupture of synovium, left hip
    M66.159Rupture of synovium, unspecified hip

    Showing 1–20 of 103

    DRG Codes

    2 rows

    DRG CodeDescription
    557Tendonitis, Myositis and Bursitis with MCC
    558Tendonitis, Myositis and Bursitis without MCC

    Typical Clinical Scenarios

    • An adult presents to the emergency department after sudden onset of intense wrist pain and a popping sensation while lifting a heavy object; there is acute loss of active finger flexion and a palpable gap over the volar forearm. Imaging and clinical exam confirm an acute complete rupture of the flexor tendon sheath and tendon with actively retracted tendon ends, requiring urgent orthopedic evaluation. A code from this group is assigned to capture the spontaneous rupture of tendon structures of the forearm/wrist. Typical codes: M66.321, M66.322
    • An elderly patient with long-standing rheumatoid arthritis develops progressive difficulty extending the index finger and intermittent triggering; outpatient evaluation documents chronic degenerative rupture of the extensor tendon over the dorsal hand with granulation tissue and synovial proliferation. This outpatient/ambulatory visit assigns a code from this group to describe chronic synovial disease complicated by tendon rupture requiring elective hand surgery planning. Typical codes: M66.141, M66.142
    • A middle-aged patient with diabetes presents for post-operative follow-up after surgical repair of a spontaneously ruptured Achilles tendon that occurred two weeks ago; the visit documents delayed healing with limited range of motion and synovial scarring. The encounter is coded to reflect the recent spontaneous rupture and current complications influencing recovery and care coordination. Typical codes: M66.271, M66.272

    Related Codes

    M65-SYNOVITIS-AND-TENOSYNOVITIS

    ICD-10-CM Code For Synovitis And Tenosynovitis: Group Overview

    M67-OTHER-DISORDERS-OF-SYNOVIUM-AND-TENDON

    ICD-10-CM Code For Other Disorders Of Synovium And Tendon: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.