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ICD-10 Guide
ICD-10 CodesM02.362

M02.362

Billable

Reiter's disease, left knee

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/12/2025

Code Description

ICD-10 M02.362 is a billable code used to indicate a diagnosis of reiter's disease, left knee.

Key Diagnostic Point:

Reiter's disease, also known as reactive arthritis, is a type of inflammatory arthritis that occurs as a reaction to an infection in another part of the body. It is characterized by the classic triad of arthritis, urethritis, and conjunctivitis. In the case of M02.362, the focus is on the left knee joint, which may exhibit swelling, pain, and stiffness due to inflammation. Anatomically, the knee joint consists of the femur, tibia, fibula, and patella, with synovial fluid providing lubrication. The inflammation in Reiter's disease can lead to synovitis, affecting the joint's range of motion and overall function. Clinically, patients may present with acute onset of knee pain, often following a genitourinary or gastrointestinal infection. The pathophysiology involves an autoimmune response where the immune system mistakenly attacks the joint tissues, leading to chronic inflammation if not managed appropriately.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of autoimmune mechanisms and joint anatomy
  • Differentiation from other forms of arthritis
  • Documentation of laterality and specific joint involvement
  • Potential for systemic manifestations affecting coding

Audit Risk Factors

  • Inadequate documentation of infection history leading to arthritis
  • Failure to specify laterality or joint involvement
  • Misclassification of reactive arthritis as primary osteoarthritis
  • Lack of supporting evidence for systemic symptoms

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include imaging studies (X-rays, MRI) to assess joint damage and functional assessments to evaluate range of motion and stability.

Common Clinical Scenarios

Common scenarios include surgical interventions for severe joint damage or arthroscopy for diagnostic purposes.

Billing Considerations

Joint-specific considerations include documenting the severity of inflammation and any structural changes observed in imaging.

Rheumatology

Documentation Requirements

Rheumatologic documentation should include laboratory tests for inflammatory markers (ESR, CRP) and disease activity scores to assess the severity of the condition.

Common Clinical Scenarios

Autoimmune scenarios may involve managing systemic symptoms alongside joint inflammation.

Billing Considerations

Consideration of systemic involvement is crucial, as Reiter's disease can affect multiple joints and lead to complications.

Physical Medicine

Documentation Requirements

Functional assessments should document the patient's mobility limitations and rehabilitation needs, including any assistive devices required.

Common Clinical Scenarios

Rehabilitation scenarios may focus on restoring function and managing pain through physical therapy.

Billing Considerations

Mobility limitations should be clearly documented to support the need for therapy and assistive devices.

Coding Guidelines

Inclusion Criteria

Use M02.362 When
  • 10 coding guidelines for M02
  • 362 require clear documentation of laterality (left knee) and the specific nature of the disease (Reiter's disease)
  • Encounter type (initial, follow
  • up) should also be documented to ensure accurate coding

Exclusion Criteria

Do NOT use M02.362 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration and/or injection into a major joint or bursa

Clinical Scenario

Used for therapeutic drainage of the left knee joint in cases of significant effusion due to Reiter's disease.

Documentation Requirements

Documentation must include indication for the procedure, joint involved, and any prior treatments.

Specialty Considerations

Orthopedic considerations include assessing joint stability and potential for surgical intervention.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has improved specificity in coding musculoskeletal conditions, allowing for better tracking of disease prevalence and treatment outcomes. M02.362 provides clear identification of laterality and specific disease characteristics.

ICD-9 vs ICD-10

The transition to ICD-10 has improved specificity in coding musculoskeletal conditions, allowing for better tracking of disease prevalence and treatment outcomes. M02.362 provides clear identification of laterality and specific disease characteristics.

Reimbursement & Billing Impact

The transition to ICD-10 has improved specificity in coding musculoskeletal conditions, allowing for better tracking of disease prevalence and treatment outcomes. M02.362 provides clear identification of laterality and specific disease characteristics.

Resources

Clinical References

  • •
    American College of Rheumatology Guidelines

Coding & Billing References

  • •
    American College of Rheumatology Guidelines

Frequently Asked Questions

What are the common symptoms of Reiter's disease?

Common symptoms include joint pain and swelling, particularly in the knees, along with possible urethritis and conjunctivitis. Patients may also experience systemic symptoms like fatigue and fever.