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    v1.0.28
    OpenPayerBilling CodesInflammatory polyarthropathiesICD-10-CM m13-other-arthritis
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    ICD-10-CM Code For Other Arthritis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group M13 includes other specified and unspecified arthritis conditions such as polyarthropathy, monoarthritis not elsewhere classified, and other inflammatory or degenerative joint disorders affecting multiple joints. These ICD-10-CM diagnosis codes are used to document clinical presentations involving joint pain, swelling, stiffness, or functional limitation across multiple joints, capturing disease distribution and complexity. Accurate coding within the ICD-10-CM M13 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM M13: Other Arthritis Overview

    The ICD-10-CM M13 group encompasses other specified and unspecified arthritis conditions that affect multiple joints and periarticular structures. These diagnoses target the musculoskeletal system, particularly inflammatory and degenerative processes involving small and large joints. Accurate coding matters for correct claim processing and to reflect clinical severity and care needs for reimbursement.

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    When to Use

    Use a code from this group when the clinical record documents arthritis affecting multiple joints or when a specified arthritis diagnosis is not classified in another ICD-10-CM category. Select the most specific code available to reflect distribution, laterality, and clinical detail for accurate reporting.

    ICD-10-CM Codes

    47 rows

    ICD-10-CM CodeDescription
    M13.0Polyarthritis, unspecified
    M13.10Monoarthritis, not elsewhere classified, unspecified site
    M13.111Monoarthritis, not elsewhere classified, right shoulder
    M13.112Monoarthritis, not elsewhere classified, left shoulder
    M13.119Monoarthritis, not elsewhere classified, unspecified shoulder
    M13.121Monoarthritis, not elsewhere classified, right elbow
    M13.122Monoarthritis, not elsewhere classified, left elbow
    M13.129Monoarthritis, not elsewhere classified, unspecified elbow
    M13.131Monoarthritis, not elsewhere classified, right wrist
    M13.132Monoarthritis, not elsewhere classified, left wrist
    M13.139Monoarthritis, not elsewhere classified, unspecified wrist
    M13.141Monoarthritis, not elsewhere classified, right hand
    M13.142Monoarthritis, not elsewhere classified, left hand
    M13.149Monoarthritis, not elsewhere classified, unspecified hand
    M13.151Monoarthritis, not elsewhere classified, right hip
    M13.152Monoarthritis, not elsewhere classified, left hip
    M13.159Monoarthritis, not elsewhere classified, unspecified hip
    M13.161Monoarthritis, not elsewhere classified, right knee
    M13.162Monoarthritis, not elsewhere classified, left knee
    M13.169Monoarthritis, not elsewhere classified, unspecified knee

    Showing 1–20 of 47

    DRG Codes

    2 rows

    DRG CodeDescription
    553Bone Diseases and Arthropathies with MCC
    554Bone Diseases and Arthropathies without MCC

    Typical Clinical Scenarios

    • An older adult with a several-year history of progressively worsening morning stiffness and symmetric pain in hands and wrists presents to primary care for worsening functional limitation despite conservative measures. Examination shows soft-tissue swelling of multiple MCP and PIP joints without erythema, and the clinician documents persistent, noninfectious polyarticular inflammatory changes attributed to chronic inflammatory arthropathy; a code from this group is used to capture the ongoing inflammatory polyarthritis affecting multiple small joints. Typical codes: M13.0, M13.10
    • A middle-aged patient arrives at urgent care with acute flare of pain, swelling, and reduced range of motion in multiple knee and ankle joints over several days following a recent viral illness; laboratory testing shows elevated inflammatory markers and the clinician treats the polyarticular inflammatory flare and documents an acute exacerbation of non-specific inflammatory polyarthritis. This presentation warrants assignment of an acute or unstable inflammatory polyarthropathy code from the list to reflect the current flare. Typical codes: M13.80, M13.81
    • A patient with long-standing inflammatory polyarthritis is hospitalized for a nonorthopedic surgical procedure and the medical team documents the chronic inflammatory joint disease as a significant comorbidity that may affect perioperative management and rehabilitation. Coding captures the chronic, multisite inflammatory arthropathy to reflect the patient’s baseline musculoskeletal status and potential impact on postoperative care. Typical codes: M13.89, M13.82}

    Related Codes

    M05-RHEUMATOID-ARTHRITIS-WITH-RHEUMATOID-FACTOR

    ICD-10-CM Code For Rheumatoid Arthritis With Rheumatoid Factor: Group Overview

    M06-OTHER-RHEUMATOID-ARTHRITIS

    ICD-10-CM Code For Other Rheumatoid Arthritis: Group Overview

    M07-ENTEROPATHIC-ARTHROPATHIES

    ICD-10-CM Code For Enteropathic Arthropathies: Group Overview

    M08-JUVENILE-ARTHRITIS

    ICD-10-CM Code For Juvenile Arthritis: Group Overview

    M10-GOUT-AND-RELATED-ARTHROPATHIES

    ICD-10-CM Code For Gout: Group Overview

    M11-OTHER-CRYSTAL-ARTHROPATHIES

    ICD-10-CM Code For Other Crystal Arthropathies: Group Overview

    M12-OTHER-AND-UNSPECIFIED-ARTHROPATHY

    ICD-10-CM Code For Other And Unspecified Arthropathy: Group Overview

    M14-ARTHROPATHIES-IN-OTHER-DISEASES

    ICD-10-CM Code For Arthropathies In Other Diseases Classified Elsewhere: 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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