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ICD-10 Guide
ICD-10 CodesM02.379

M02.379

Billable

Reiter's disease, unspecified ankle and foot

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

Code Description

ICD-10 M02.379 is a billable code used to indicate a diagnosis of reiter's disease, unspecified ankle and foot.

Key Diagnostic Point:

Reiter's disease, also known as reactive arthritis, is an inflammatory condition that typically arises following an infection, most commonly in the urogenital or gastrointestinal tract. It is characterized by a triad of symptoms: arthritis, urethritis, and conjunctivitis. In the context of the ankle and foot, patients may experience swelling, pain, and stiffness in these joints, which can lead to significant functional impairment. Anatomically, the ankle joint comprises the tibia, fibula, and talus, while the foot consists of multiple bones including the tarsals, metatarsals, and phalanges. The inflammatory process in Reiter's disease can lead to enthesitis, affecting the sites where tendons and ligaments attach to bone, particularly in the heel and plantar fascia. Clinically, patients may present with asymmetric joint involvement, often affecting the lower extremities, and may report morning stiffness and pain that improves with activity. The pathophysiology involves an autoimmune response triggered by the initial infection, leading to synovial inflammation and joint damage if left untreated.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and joint involvement
  • Need for differentiation from other inflammatory arthritides
  • Potential for systemic manifestations complicating diagnosis
  • Documentation of prior infections and their relation to symptoms

Audit Risk Factors

  • Inadequate documentation of prior infections leading to arthritis
  • Failure to specify laterality of joint involvement
  • Lack of detailed functional assessments
  • Misclassification of Reiter's disease as another type of arthritis

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

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

Common Clinical Scenarios

Patients may present with acute onset of ankle pain following a recent infection, requiring evaluation for potential surgical intervention if conservative management fails.

Billing Considerations

Joint-specific considerations include assessing for enthesitis and the impact of inflammation on mobility and daily activities.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include laboratory tests for inflammatory markers (ESR, CRP) and disease activity indices to monitor progression.

Common Clinical Scenarios

Patients may exhibit systemic symptoms such as fever or conjunctivitis alongside joint pain, necessitating a comprehensive evaluation for autoimmune conditions.

Billing Considerations

Systemic involvement may require monitoring for complications such as uveitis or skin lesions, which can influence treatment decisions.

Physical Medicine

Documentation Requirements

Functional assessments should document the patient's ability to perform activities of daily living and any need for assistive devices.

Common Clinical Scenarios

Rehabilitation scenarios may involve physical therapy to improve joint mobility and strength following acute exacerbations.

Billing Considerations

Mobility limitations should be clearly documented, including the need for adaptive equipment or modifications to home environments.

Coding Guidelines

Inclusion Criteria

Use M02.379 When
  • 10 coding guidelines for M02
  • 379 require documentation of laterality (if applicable), severity of symptoms, and the type of encounter (initial, follow
  • up, etc
  • It is essential to link the diagnosis to any prior infections that may have triggered the condition

Exclusion Criteria

Do NOT use M02.379 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 joint swelling and pain management in Reiter's disease.

Documentation Requirements

Document the joint involved, indication for the procedure, and any prior treatments.

Specialty Considerations

Orthopedic considerations include assessing joint effusion and potential for joint damage.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has increased specificity in coding musculoskeletal conditions, allowing for better tracking of disease prevalence and treatment outcomes. Coders must be diligent in capturing the nuances of conditions like Reiter's disease to ensure accurate reimbursement and quality care.

ICD-9 vs ICD-10

The transition to ICD-10 has increased specificity in coding musculoskeletal conditions, allowing for better tracking of disease prevalence and treatment outcomes. Coders must be diligent in capturing the nuances of conditions like Reiter's disease to ensure accurate reimbursement and quality care.

Reimbursement & Billing Impact

reimbursement and quality care.

Resources

Clinical References

  • •
    American College of Rheumatology Guidelines for the Management of Reiter's Disease

Coding & Billing References

  • •
    American College of Rheumatology Guidelines for the Management of Reiter's Disease

Frequently Asked Questions

What are the common symptoms of Reiter's disease?

Common symptoms include joint pain and swelling, particularly in the ankles and feet, along with possible conjunctivitis and urethritis. Patients may also experience morning stiffness and fatigue.