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    v1.0.28
    OpenPayerBilling CodesOther soft tissue disordersICD-10-CM m77-other-enthesopathies
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    ICD-10-CM Code For Other Enthesopathies: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group M77 includes enthesopathies such as lateral epicondylitis, medial epicondylitis, and plantar fasciitis, covering disorders of tendon or ligament attachment to bone. These ICD-10-CM diagnosis codes are used to document focal musculoskeletal pain, inflammation at enthesis sites, and related functional impairment or chronicity. Accurate coding within the ICD-10-CM M77 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM M77: Other Enthesopathies Overview

    This group includes disorders of the entheses, the sites where tendons or ligaments attach to bone, causing focal pain and inflammation. It primarily affects the musculoskeletal system and commonly involves areas such as the elbow, knee, heel, and hip. Accurate coding ensures clear clinical records and supports appropriate reimbursement by reflecting the specific enthesopathy site and clinical complexity.

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    When to Use

    Use a code from this group when the clinical documentation identifies enthesopathy at a specific anatomical site such as the elbow, knee, heel, or hip. Select the code that reflects the exact site, laterality, and documented acuity or chronicity to support accurate coding and billing.

    ICD-10-CM Codes

    20 rows

    ICD-10-CM CodeDescription
    M77.00Medial epicondylitis, unspecified elbow
    M77.01Medial epicondylitis, right elbow
    M77.02Medial epicondylitis, left elbow
    M77.10Lateral epicondylitis, unspecified elbow
    M77.11Lateral epicondylitis, right elbow
    M77.12Lateral epicondylitis, left elbow
    M77.20Periarthritis, unspecified wrist
    M77.21Periarthritis, right wrist
    M77.22Periarthritis, left wrist
    M77.30Calcaneal spur, unspecified foot
    M77.31Calcaneal spur, right foot
    M77.32Calcaneal spur, left foot
    M77.40Metatarsalgia, unspecified foot
    M77.41Metatarsalgia, right foot
    M77.42Metatarsalgia, left foot
    M77.50Other enthesopathy of unspecified foot and ankle
    M77.51Other enthesopathy of right foot and ankle
    M77.52Other enthesopathy of left foot and ankle
    M77.8Other enthesopathies, not elsewhere classified
    M77.9Enthesopathy, unspecified

    DRG Codes

    5 rows

    DRG CodeDescription
    557Tendonitis, Myositis and Bursitis with MCC
    558Tendonitis, Myositis and Bursitis without MCC
    564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
    565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
    566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC

    Typical Clinical Scenarios

    • An adult runner presents to urgent care with sudden onset lateral elbow pain after increasing training intensity; exam shows focal tenderness at the lateral epicondyle with pain on resisted wrist extension consistent with acute lateral epicondylopathy (tennis elbow). Imaging is not required for diagnosis and a specific enthesopathy code is assigned for the acute tendinous insertion disorder. Typical codes: M77.11, M77.12
    • A middle-aged office worker reports months of progressive medial elbow pain and morning stiffness worsened by repetitive pronation and supination; physical exam reveals chronic tenderness at the medial epicondyle and decreased grip strength consistent with chronic medial epicondylopathy. Because this is a long-standing enthesopathy related to overuse, a chronic/unspecified code for the medial enthesopathy is used. Typical codes: M77.01, M77.02
    • An older patient with diabetes and peripheral neuropathy is evaluated for heel pain with localized tenderness at the calcaneal insertion of the plantar fascia; symptoms have failed conservative care and contribute to gait instability and falls. The plantar fasciitis/enthesopathy is coded as the calcaneal insertion enthesopathy and documented as a comorbid factor affecting ambulatory function. Typical codes: M77.40, M77.41

    Related Codes

    M70-SOFT-TISSUE-DISORDERS-RELATED-TO-USE

    ICD-10-CM Code For Soft Tissue Disorders Related To Use Overuse And Pressure: Group Overview

    M71-OTHER-BURSOPATHIES

    ICD-10-CM Code For Other Bursopathies: Group Overview

    M72-FIBROBLASTIC-DISORDERS

    ICD-10-CM Code For Fibroblastic Disorders: Group Overview

    M75-SHOULDER-LESIONS

    ICD-10-CM Code For Shoulder Lesions: Group Overview

    M76-ENTHESOPATHIES-LOWER-LIMB

    ICD-10-CM Code For Enthesopathies Lower Limb Excluding Foot: Group Overview

    M79-OTHER-SOFT-TISSUE-DISORDERS

    ICD-10-CM Code For Other And Unspecified Soft Tissue Disorders Not Elsewhere Classified: 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.
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