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    v1.0.28
    OpenPayerBilling CodesOther joint disordersICD-10-CM m22-disorder-of-patella
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    ICD-10-CM Code For Disorder Of Patella: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group M22 includes conditions affecting the kneecap such as patellar malalignment, instability, and degenerative changes of the patellofemoral joint. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving patellar pain, mechanical symptoms, recurrent subluxation or dislocation, and degenerative alterations that impact knee function. Accurate coding within the ICD-10-CM M22 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM M22: Disorder of Patella Overview

    The ICD-10-CM M22 code group represents disorders of the patella, including maltracking, instability, and degenerative changes affecting the kneecap and its articulation with the femur. These diagnoses target the musculoskeletal system, specifically the patellofemoral joint. Accurate coding matters for correct claim processing and to reflect the clinical severity and treatment needs that affect reimbursement.

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    When to Use

    Use a code from this group when the primary clinical problem involves the patella or patellofemoral joint, such as documented patellar instability, malalignment, or degenerative changes causing symptoms. Assign the most specific code available to capture laterality, chronicity, and any associated sequelae when documented.

    ICD-10-CM Codes

    21 rows

    ICD-10-CM CodeDescription
    M22.00Recurrent dislocation of patella, unspecified knee
    M22.01Recurrent dislocation of patella, right knee
    M22.02Recurrent dislocation of patella, left knee
    M22.10Recurrent subluxation of patella, unspecified knee
    M22.11Recurrent subluxation of patella, right knee
    M22.12Recurrent subluxation of patella, left knee
    M22.2X1Patellofemoral disorders, right knee
    M22.2X2Patellofemoral disorders, left knee
    M22.2X9Patellofemoral disorders, unspecified knee
    M22.3X1Other derangements of patella, right knee
    M22.3X2Other derangements of patella, left knee
    M22.3X9Other derangements of patella, unspecified knee
    M22.40Chondromalacia patellae, unspecified knee
    M22.41Chondromalacia patellae, right knee
    M22.42Chondromalacia patellae, left knee
    M22.8X1Other disorders of patella, right knee
    M22.8X2Other disorders of patella, left knee
    M22.8X9Other disorders of patella, unspecified knee
    M22.90Unspecified disorder of patella, unspecified knee
    M22.91Unspecified disorder of patella, right knee

    Showing 1–20 of 21

    DRG Codes

    2 rows

    DRG CodeDescription
    562Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC
    563Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC

    Typical Clinical Scenarios

    • A young athlete presents to urgent care after twisting their knee during a soccer game with immediate anterior knee pain, a palpable grinding sensation when extending the knee, and episodes of the patella momentarily slipping laterally. Examination shows lateral patellar tracking and positive apprehension test; radiographs rule out fracture but demonstrate patellar subluxation. A disorder of the patella code is assigned for the acute patellar instability/subluxation event. Typical codes: M22.0X1, M22.2X1.
    • A middle-aged patient with a multi-year history of anterior knee pain, progressive crepitus with activity, and episodic catching reports worsening pain and functional limitation despite conservative therapy. Clinical assessment and MRI show chronic patellofemoral chondromalacia with focal cartilage degeneration of the patella, and management is focused on nonoperative care and monitoring. A chronic patellar disorder code is used to capture the ongoing degenerative process as the primary knee diagnosis. Typical codes: M22.4X1, M22.9X1.
    • An older adult presents for preoperative evaluation prior to total knee arthroplasty; history includes prior lateral release surgery and persistent patellar maltracking with recurrent dislocation episodes contributing to advanced joint degeneration and secondary osteoarthritis of the patellofemoral compartment. The encounter documents the patellar disorder as a comorbidity complicating surgical planning and influencing implant choice and surgical technique. Typical codes: M22.3X2, M22.8X2.

    Related Codes

    M20-ACQUIRED-DEFORMITIES-FINGERS-TOES

    ICD-10-CM Code For Acquired Deformities Of Fingers And Toes: Group Overview

    M21-OTHER-ACQUIRED-DEFORMITIES-OF-LIMBS

    ICD-10-CM Code For Other Acquired Deformities Of Limbs: Group Overview

    M23-INTERNAL-DERANGEMENT-OF-KNEE

    ICD-10-CM Code For Internal Derangement Of Knee: Group Overview

    M24-OTHER-SPECIFIC-JOINT-DERANGEMENTS

    ICD-10-CM Code For Other Specific Joint Derangements: Group Overview

    M25-OTHER-JOINT-DISORDER-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Other Joint Disorder 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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