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ICD-10 Guide
ICD-10 CodesM05.361

M05.361

Billable

Rheumatoid heart disease with rheumatoid arthritis of right knee

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

Code Description

ICD-10 M05.361 is a billable code used to indicate a diagnosis of rheumatoid heart disease with rheumatoid arthritis of right knee.

Key Diagnostic Point:

Rheumatoid heart disease is a complication of rheumatoid arthritis (RA), an autoimmune disorder characterized by chronic inflammation of the joints. In this condition, the immune system mistakenly attacks the synovial membrane, leading to joint swelling, pain, and potential joint damage. The right knee is often affected due to its weight-bearing role and frequent use. Anatomically, the knee joint comprises the femur, tibia, fibula, and patella, surrounded by ligaments, tendons, and cartilage. Rheumatoid heart disease can manifest as pericarditis, myocarditis, or valvular heart disease, complicating the clinical picture. Patients may present with joint pain, swelling, and systemic symptoms such as fatigue and fever. The interplay between joint and cardiac involvement necessitates a comprehensive treatment approach, including disease-modifying antirheumatic drugs (DMARDs), corticosteroids, and possibly surgical interventions for severe joint damage.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Involvement of multiple body systems (musculoskeletal and cardiovascular)
  • Need for precise documentation of joint involvement and severity
  • Potential for overlapping symptoms with other conditions
  • Complexity of treatment regimens and monitoring

Audit Risk Factors

  • Inadequate documentation of joint involvement and severity
  • Failure to document systemic manifestations of rheumatoid arthritis
  • Misclassification of laterality or joint involvement
  • Lack of clarity in treatment plans and follow-up care

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed imaging reports (X-rays, MRIs) and functional assessments (range of motion, strength testing) are essential for orthopedic documentation.

Common Clinical Scenarios

Common scenarios include joint replacement surgeries or arthroscopic procedures for severe knee damage.

Billing Considerations

Documentation should reflect the severity of joint damage and any surgical interventions performed.

Rheumatology

Documentation Requirements

Rheumatologic documentation should include lab results for inflammation markers (e.g., ESR, CRP) and assessments of disease activity (e.g., DAS28 score).

Common Clinical Scenarios

Patients may present with exacerbations of RA requiring adjustments in DMARD therapy or corticosteroid use.

Billing Considerations

Systemic involvement, including cardiac symptoms, must be documented to support the diagnosis of rheumatoid heart disease.

Physical Medicine

Documentation Requirements

Functional assessments should evaluate mobility, pain levels, and the need for assistive devices.

Common Clinical Scenarios

Rehabilitation scenarios may include post-operative recovery from knee surgery or management of chronic pain.

Billing Considerations

Mobility limitations due to joint involvement and systemic symptoms should be clearly documented.

Coding Guidelines

Inclusion Criteria

Use M05.361 When
  • 10 coding guidelines require accurate documentation of laterality (right knee), severity of the condition, and the type of encounter (initial, follow
  • up, etc
  • Coders must ensure that all relevant details are captured to support the diagnosis

Exclusion Criteria

Do NOT use M05.361 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 RA patients.

Documentation Requirements

Document the joint involved, the procedure performed, and the indication for the procedure.

Specialty Considerations

Orthopedic and rheumatologic considerations for joint management.

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, enabling coders to capture the complexity of conditions like rheumatoid arthritis with systemic involvement more accurately.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, enabling coders to capture the complexity of conditions like rheumatoid arthritis with systemic involvement more accurately.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, enabling coders to capture the complexity of conditions like rheumatoid arthritis with systemic involvement more accurately.

Resources

Clinical References

  • •
    American College of Rheumatology Guidelines

Coding & Billing References

  • •
    American College of Rheumatology Guidelines

Frequently Asked Questions

What are the key documentation requirements for coding M05.361?

Key documentation requirements include detailed descriptions of joint involvement (specifically the right knee), evidence of systemic involvement (such as cardiac symptoms), and treatment plans that reflect the complexity of managing both rheumatoid arthritis and its complications.