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    v1.0.28
    OpenPayerBilling CodesInflammatory polyarthropathiesICD-10-CM m12-other-and-unspecified-arthropathy
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    ICD-10-CM Code For Other And Unspecified Arthropathy: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group M12 includes a range of other and unspecified arthropathies such as reactive arthropathies, juvenile arthropathies not elsewhere classified, and other non-specific inflammatory joint disorders that do not fit distinct categories. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving inflammatory or unspecified joint disease, capturing disease distribution, severity, and any associated systemic features or complications. Accurate coding within the ICD-10-CM M12 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM M12: Other And Unspecified Arthropathy Overview

    The diagnoses in this group represent arthropathies that are inflammatory or otherwise non-specific and do not fit into more precisely defined categories of joint disease. They target joints and periarticular structures and often reflect inflammatory polyarthropathy or other unspecified arthritic processes. Accurate coding matters because it supports clinical documentation, appropriate claim adjudication, and communication of disease burden for reimbursement and care planning.

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    When to Use

    Use a code from this group when a clinician documents an arthropathy that is inflammatory or unspecified and does not meet criteria for a more specific arthropathy code. These codes are appropriate when clinical findings, laboratory tests, or imaging do not support assignment to a defined arthropathy category.

    ICD-10-CM Codes

    169 rows

    ICD-10-CM CodeDescription
    M12.00Chronic postrheumatic arthropathy [Jaccoud], unspecified site
    M12.011Chronic postrheumatic arthropathy [Jaccoud], right shoulder
    M12.012Chronic postrheumatic arthropathy [Jaccoud], left shoulder
    M12.019Chronic postrheumatic arthropathy [Jaccoud], unspecified shoulder
    M12.021Chronic postrheumatic arthropathy [Jaccoud], right elbow
    M12.022Chronic postrheumatic arthropathy [Jaccoud], left elbow
    M12.029Chronic postrheumatic arthropathy [Jaccoud], unspecified elbow
    M12.031Chronic postrheumatic arthropathy [Jaccoud], right wrist
    M12.032Chronic postrheumatic arthropathy [Jaccoud], left wrist
    M12.039Chronic postrheumatic arthropathy [Jaccoud], unspecified wrist
    M12.041Chronic postrheumatic arthropathy [Jaccoud], right hand
    M12.042Chronic postrheumatic arthropathy [Jaccoud], left hand
    M12.049Chronic postrheumatic arthropathy [Jaccoud], unspecified hand
    M12.051Chronic postrheumatic arthropathy [Jaccoud], right hip
    M12.052Chronic postrheumatic arthropathy [Jaccoud], left hip
    M12.059Chronic postrheumatic arthropathy [Jaccoud], unspecified hip
    M12.061Chronic postrheumatic arthropathy [Jaccoud], right knee
    M12.062Chronic postrheumatic arthropathy [Jaccoud], left knee
    M12.069Chronic postrheumatic arthropathy [Jaccoud], unspecified knee
    M12.071Chronic postrheumatic arthropathy [Jaccoud], right ankle and foot

    Showing 1–20 of 169

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    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • An older adult presents to the emergency department with sudden onset of severe symmetrical pain, swelling, and warmth in multiple finger and wrist joints after a recent upper respiratory infection; laboratory testing shows elevated inflammatory markers and no prior rheumatologic diagnosis. The acute polyarticular inflammatory presentation prompts assignment of an acute inflammatory polyarthropathy code from this group to capture the new systemic synovitis affecting small joints. Typical codes: M12.111, M12.112
    • A middle-aged patient in primary care has a months‑long history of persistent morning stiffness and progressive pain affecting the shoulders, knees, and hips with functional limitation; prior workup excluded rheumatoid arthritis and crystalline arthropathy. Because this is a chronic, nonclassifiable inflammatory polyarthropathy involving large and small joints managed longitudinally by the clinician, a chronic/ongoing code from the group is used to document the persistent inflammatory arthropathy. Typical codes: M12.18, M12.19
    • A hospitalized immunocompromised patient develops new-onset multifocal joint swelling and erythema while being treated for bacterial sepsis, and septic arthritis has been ruled out by negative joint aspiration cultures; the treating team documents an inflammatory polyarthropathy as a complication of systemic infection and immune dysregulation. In this inpatient complication/comorbidity scenario a secondary inflammatory arthropathy code from the group is assigned to capture the systemic inflammatory joint involvement. Typical codes: M12.30, M12.311

    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

    M13-OTHER-ARTHRITIS

    ICD-10-CM Code For Other Arthritis: 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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