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ICD-10 Guide
ICD-10 CodesM05.062

M05.062

Billable

Felty's syndrome, left knee

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

Code Description

ICD-10 M05.062 is a billable code used to indicate a diagnosis of felty's syndrome, left knee.

Key Diagnostic Point:

Felty's syndrome is a rare complication of rheumatoid arthritis characterized by the triad of rheumatoid arthritis, splenomegaly, and neutropenia. The left knee may be involved in the inflammatory process, leading to joint swelling, pain, and decreased range of motion. Anatomically, the knee joint consists of the femur, tibia, fibula, and patella, with synovial fluid providing lubrication. In Felty's syndrome, the inflammatory response can lead to synovitis, which may cause joint effusion and damage to cartilage and bone over time. Clinically, patients may present with joint deformities, systemic symptoms such as fatigue, and increased susceptibility to infections due to neutropenia. The management of Felty's syndrome often involves disease-modifying antirheumatic drugs (DMARDs), corticosteroids, and supportive care to address joint symptoms and systemic complications.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Involvement of multiple systems (rheumatologic and hematologic)
  • Need for detailed documentation of joint involvement and severity
  • Potential for overlapping diagnoses (e.g., rheumatoid arthritis)
  • Variability in clinical presentation and treatment responses

Audit Risk Factors

  • Inadequate documentation of joint involvement and severity
  • Failure to document systemic symptoms related to Felty's syndrome
  • Misclassification of the condition due to overlapping diagnoses
  • Lack of evidence for neutropenia or splenomegaly in the medical record

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include imaging studies (e.g., X-rays, MRIs) to assess joint damage, functional assessments to evaluate range of motion, and treatment plans detailing surgical or non-surgical interventions.

Common Clinical Scenarios

Common scenarios include joint injections for symptomatic relief, arthroscopy for evaluation of joint damage, and joint replacement in advanced cases.

Billing Considerations

Joint-specific considerations include documenting the degree of joint effusion, presence of deformities, and impact on mobility.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include laboratory tests for inflammatory markers (e.g., ESR, CRP), complete blood counts to monitor neutropenia, and assessments of disease activity using validated scales.

Common Clinical Scenarios

Common scenarios involve managing disease flares, adjusting DMARD therapy, and addressing complications related to neutropenia.

Billing Considerations

Systemic involvement should be documented, including any signs of splenomegaly and infections.

Physical Medicine

Documentation Requirements

Functional assessments should evaluate the patient's ability to perform activities of daily living, mobility assessments, and rehabilitation goals.

Common Clinical Scenarios

Rehabilitation scenarios may include physical therapy for joint mobility, occupational therapy for adaptive strategies, and pain management interventions.

Billing Considerations

Mobility limitations should be documented, including the need for assistive devices such as braces or walkers.

Coding Guidelines

Inclusion Criteria

Use M05.062 When
  • 10 coding guidelines for M05
  • 062 require documentation of laterality (left knee), severity of joint involvement, and the type of encounter (initial, follow
  • up, etc
  • Accurate coding also necessitates the inclusion of systemic symptoms associated with Felty's syndrome

Exclusion Criteria

Do NOT use M05.062 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 aspiration of the left knee joint to relieve swelling and pain.

Documentation Requirements

Document the indication for the procedure, joint involved, and any complications.

Specialty Considerations

Orthopedic considerations include assessing joint stability and potential need for further intervention.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, particularly those with systemic involvement like Felty's syndrome. This specificity aids in better tracking of disease prevalence and treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, particularly those with systemic involvement like Felty's syndrome. This specificity aids in better tracking of disease prevalence and treatment outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, particularly those with systemic involvement like Felty's syndrome. This specificity aids in better tracking of disease prevalence and treatment outcomes.

Resources

Clinical References

  • •
    American College of Rheumatology Guidelines

Coding & Billing References

  • •
    American College of Rheumatology Guidelines

Frequently Asked Questions

What are the key symptoms of Felty's syndrome?

Key symptoms include joint pain and swelling, particularly in the knees, splenomegaly, and recurrent infections due to neutropenia. Patients may also experience fatigue and systemic symptoms related to rheumatoid arthritis.