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v1.0.0
ICD-10 Guide
ICD-10 CodesM05.79

M05.79

Billable

Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement

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

Code Description

ICD-10 M05.79 is a billable code used to indicate a diagnosis of rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement.

Key Diagnostic Point:

Rheumatoid arthritis (RA) is a chronic inflammatory disorder primarily affecting the synovial joints, characterized by the presence of rheumatoid factor (RF) in the serum. This condition leads to synovitis, which can result in joint destruction and deformity if left untreated. Anatomically, RA commonly affects the small joints of the hands and feet, but it can also involve larger joints such as the knees, elbows, and shoulders. The pathophysiology involves an autoimmune response where the immune system mistakenly attacks the synovial membrane, leading to inflammation and subsequent joint damage. Clinically, patients may present with symmetrical joint pain, stiffness, and swelling, particularly in the morning or after periods of inactivity. Movement limitations are common, affecting daily activities and overall quality of life. In cases coded as M05.79, there is no evidence of systemic involvement, meaning that while multiple joints are affected, there are no complications involving other organs or systems.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Presence of multiple joint involvement complicates documentation.
  • Need for accurate differentiation from other types of arthritis.
  • Requirement for detailed clinical history and examination findings.
  • Potential for overlapping symptoms with other rheumatologic conditions.

Audit Risk Factors

  • Inadequate documentation of joint involvement and severity.
  • Failure to document the absence of systemic involvement.
  • Misclassification of RA as another type of arthritis.
  • Lack of supporting evidence for the presence of rheumatoid factor.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include imaging studies (X-rays, MRIs) to assess joint damage, functional assessments, and treatment plans. Detailed descriptions of joint range of motion and any surgical interventions are crucial.

Common Clinical Scenarios

Common scenarios include joint replacement surgeries or arthroscopic procedures for severe joint damage due to RA.

Billing Considerations

Documentation must specify which joints are involved and the degree of functional impairment.

Rheumatology

Documentation Requirements

Rheumatologic documentation should include laboratory results showing rheumatoid factor positivity, inflammatory markers (ESR, CRP), and assessments of disease activity (e.g., DAS28 score).

Common Clinical Scenarios

Patients may present with flares of RA requiring adjustments in therapy or monitoring for potential complications.

Billing Considerations

Consideration of comorbidities and the impact of RA on overall health is essential.

Physical Medicine

Documentation Requirements

Functional assessments should document mobility limitations, pain levels, and the need for assistive devices. Rehabilitation plans should be clearly outlined.

Common Clinical Scenarios

Rehabilitation scenarios may include physical therapy for joint mobility and strength training.

Billing Considerations

Focus on the patient's ability to perform activities of daily living and the impact of RA on their functional status.

Coding Guidelines

Inclusion Criteria

Use M05.79 When
  • Coders must ensure accurate documentation of laterality (if applicable), severity of joint involvement, and the type of encounter (initial, follow
  • up, etc
  • Specificity in documenting the absence of systemic involvement is critical

Exclusion Criteria

Do NOT use M05.79 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits for RA management.

Documentation Requirements

Documentation must include history, examination findings, and treatment plan.

Specialty Considerations

Rheumatology focus on disease activity and management.

20610CPT Code

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

Clinical Scenario

Used for joint injections in RA patients.

Documentation Requirements

Indicate the joint involved and reason for the procedure.

Specialty Considerations

Orthopedic or rheumatologic considerations for joint health.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for greater specificity in coding RA, enabling coders to capture the complexity of the disease and its manifestations more accurately. This specificity aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding RA, enabling coders to capture the complexity of the disease and its manifestations more accurately. This specificity aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding RA, enabling coders to capture the complexity of the disease and its manifestations more accurately. This specificity aids in better patient management and resource allocation.

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 M05.79?

Key documentation includes a detailed clinical history, examination findings, laboratory results showing rheumatoid factor positivity, and imaging studies to assess joint involvement. It is also important to document the absence of systemic involvement.