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ICD-10 Guide
ICD-10 CodesM05.00

M05.00

Billable

Felty's syndrome, unspecified site

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

Code Description

ICD-10 M05.00 is a billable code used to indicate a diagnosis of felty's syndrome, unspecified site.

Key Diagnostic Point:

Felty's syndrome is a rare autoimmune disorder characterized by the triad of rheumatoid arthritis (RA), splenomegaly, and neutropenia. It primarily affects individuals with long-standing RA, leading to systemic complications. Anatomically, the condition involves the joints, particularly the hands and feet, where inflammation can cause pain, swelling, and deformities. The spleen, an organ involved in immune response, becomes enlarged due to the increased demand for blood cell production. Clinically, patients may present with joint stiffness, fatigue, and recurrent infections due to low white blood cell counts. The pathophysiology involves immune dysregulation, where the body mistakenly attacks its own tissues, leading to chronic inflammation and joint damage. Diagnosis is often confirmed through clinical evaluation, laboratory tests for rheumatoid factor, anti-CCP antibodies, and imaging studies to assess joint involvement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of autoimmune disease mechanisms
  • Involves multiple body systems (musculoskeletal and hematologic)
  • Documentation of joint involvement and systemic symptoms
  • Potential for overlapping conditions (e.g., RA)

Audit Risk Factors

  • Inadequate documentation of joint involvement
  • Failure to document splenomegaly or neutropenia
  • Misclassification of RA severity
  • Lack of supporting lab results

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include detailed imaging reports (X-rays, MRIs) showing joint damage, functional assessments, and treatment plans addressing joint preservation.

Common Clinical Scenarios

Patients may require surgical intervention for joint deformities or severe pain management, necessitating clear documentation of the orthopedic approach.

Billing Considerations

Joint-specific considerations include the degree of deformity, range of motion limitations, and the impact on daily activities.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include lab results indicating inflammation markers (ESR, CRP), disease activity scores, and assessments of systemic involvement.

Common Clinical Scenarios

Management of Felty's syndrome often involves immunosuppressive therapies and monitoring for complications related to neutropenia.

Billing Considerations

Systemic involvement may necessitate interdisciplinary collaboration, particularly in managing infections due to neutropenia.

Physical Medicine

Documentation Requirements

Functional assessments should evaluate mobility limitations, pain levels, and the need for assistive devices to enhance patient independence.

Common Clinical Scenarios

Rehabilitation may focus on improving joint function and overall physical conditioning to counteract the effects of RA and Felty's syndrome.

Billing Considerations

Mobility limitations may require tailored rehabilitation programs to address specific joint impairments and enhance quality of life.

Coding Guidelines

Inclusion Criteria

Use M05.00 When
  • 10 coding guidelines for M05
  • 00 require documentation of the specific site of joint involvement when applicable, as well as the severity of the condition
  • Encounters should be coded based on the patient's current status, whether it's an initial visit, follow
  • up, or complication management

Exclusion Criteria

Do NOT use M05.00 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99214CPT Code

Established patient office visit, moderate complexity

Clinical Scenario

Used for follow-up visits to manage Felty's syndrome and monitor treatment efficacy.

Documentation Requirements

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

Specialty Considerations

Rheumatology and primary care considerations for ongoing management.

20610CPT Code

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

Clinical Scenario

Used when joint effusion is present in patients with Felty's syndrome.

Documentation Requirements

Indicate the joint involved and the reason for the procedure.

Specialty Considerations

Orthopedic 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, including Felty's syndrome. This specificity aids in better tracking of disease prevalence and management outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, including Felty's syndrome. This specificity aids in better tracking of disease prevalence and management outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding musculoskeletal conditions, including Felty's syndrome. This specificity aids in better tracking of disease prevalence and management outcomes.

Resources

Clinical References

  • •
    American College of Rheumatology Guidelines

Coding & Billing References

  • •
    American College of Rheumatology Guidelines

Frequently Asked Questions

What are the common symptoms of Felty's syndrome?

Common symptoms include joint pain and swelling, recurrent infections due to neutropenia, fatigue, and splenomegaly. Patients may also experience systemic symptoms related to rheumatoid arthritis.