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ICD-10 Guide
ICD-10 CodesM05.162

M05.162

Billable

Rheumatoid lung disease with rheumatoid arthritis of left knee

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

Code Description

ICD-10 M05.162 is a billable code used to indicate a diagnosis of rheumatoid lung disease with rheumatoid arthritis of left knee.

Key Diagnostic Point:

Rheumatoid lung disease is a serious complication of rheumatoid arthritis (RA), characterized by inflammation and fibrosis of lung tissue, which can lead to respiratory issues. The left knee involvement indicates that the patient has active rheumatoid arthritis affecting this specific joint, leading to pain, swelling, and potential loss of function. Anatomically, the left knee consists of the femur, tibia, fibula, patella, and surrounding ligaments and cartilage. The pathophysiology of RA involves an autoimmune response that targets synovial tissue, resulting in joint inflammation and damage. Clinically, patients may present with joint stiffness, particularly in the morning, and systemic symptoms such as fatigue and weight loss. The presence of lung disease may manifest as chronic cough, dyspnea, or pleuritic chest pain, complicating the management of the patient's overall health.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Involvement of multiple body systems (musculoskeletal and respiratory)
  • Need for precise documentation of joint involvement and laterality
  • Complexity of managing coexisting conditions (RA and lung disease)
  • Variability in clinical presentation and severity of symptoms

Audit Risk Factors

  • Inadequate documentation of lung disease severity
  • Failure to specify laterality of joint involvement
  • Misclassification of joint involvement as non-inflammatory
  • Lack of evidence for systemic involvement in documentation

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include imaging studies (X-rays, MRIs) to assess joint damage, functional assessments to evaluate mobility, and detailed descriptions of joint swelling and tenderness.

Common Clinical Scenarios

Common scenarios include surgical interventions such as arthroscopy or total knee arthroplasty for severe joint damage.

Billing Considerations

Joint-specific considerations include documenting the range of motion, presence of effusion, and any deformities.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include laboratory tests (e.g., rheumatoid factor, anti-CCP antibodies), imaging for lung involvement, and assessments of disease activity (e.g., DAS28 score).

Common Clinical Scenarios

Scenarios often involve managing disease-modifying antirheumatic drugs (DMARDs) and monitoring for side effects.

Billing Considerations

Systemic involvement requires careful tracking of lung function tests and potential pulmonary complications.

Physical Medicine

Documentation Requirements

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

Common Clinical Scenarios

Rehabilitation scenarios may include physical therapy for joint mobility and respiratory therapy for lung function.

Billing Considerations

Mobility limitations due to joint pain and respiratory issues must be documented to justify therapy.

Coding Guidelines

Inclusion Criteria

Use M05.162 When
  • 10 coding guidelines require specificity in laterality (left knee) and severity of both rheumatoid arthritis and lung disease
  • Documentation must reflect the current encounter type, whether it is an initial visit, follow
  • up, or exacerbation

Exclusion Criteria

Do NOT use M05.162 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 effusion management in the left knee.

Documentation Requirements

Document the joint accessed, amount of fluid removed, and any therapeutic agents injected.

Specialty Considerations

Orthopedic considerations include the need for imaging guidance in some cases.

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 better tracking of disease progression and treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, enabling better tracking of disease progression and treatment outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, enabling better tracking of disease progression 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 documentation points for coding M05.162?

Key documentation points include specifying the laterality of the knee joint, detailing the severity of both the rheumatoid arthritis and lung disease, and providing evidence of systemic involvement through lab results and imaging studies.