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ICD-10 Guide
ICD-10 CodesM05.07

M05.07

Billable

Felty's syndrome, ankle and foot

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

Code Description

ICD-10 M05.07 is a billable code used to indicate a diagnosis of felty's syndrome, ankle and foot.

Key Diagnostic Point:

Felty's syndrome is a rare complication of rheumatoid arthritis characterized by the triad of rheumatoid arthritis, splenomegaly, and leukopenia. In the context of the ankle and foot, patients may experience significant joint inflammation, leading to pain, swelling, and deformities in the tarsal and metatarsal joints. The pathophysiology involves autoimmune processes that result in synovial inflammation and subsequent joint damage. Clinically, patients may present with limited range of motion, difficulty in ambulation, and systemic symptoms such as fatigue and malaise. The ankle and foot joints are particularly affected due to their weight-bearing function, which exacerbates the symptoms of arthritis. The anatomical considerations include the complex structure of the ankle joint, comprising the tibia, fibula, and talus, as well as the numerous ligaments and tendons that stabilize the foot. This condition requires careful management to prevent further joint deterioration and maintain mobility.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Multisystem involvement complicating diagnosis and treatment
  • Need for detailed documentation of joint involvement and severity
  • Potential for overlapping symptoms with other rheumatologic conditions
  • Variability in clinical presentation among patients

Audit Risk Factors

  • Inadequate documentation of joint involvement and severity
  • Failure to document systemic symptoms or comorbidities
  • Misclassification of the condition due to overlapping symptoms with other arthritides
  • Lack of evidence for the diagnosis in the medical record

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 notes on joint examination findings.

Common Clinical Scenarios

Patients may present with severe ankle pain requiring surgical intervention, such as arthrodesis or joint replacement, due to advanced joint destruction.

Billing Considerations

Orthopedic considerations include the need for joint-specific documentation of deformities and functional limitations, as well as the impact of systemic disease on surgical outcomes.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include laboratory tests for inflammatory markers (e.g., ESR, CRP), disease activity scores, and assessments of splenomegaly.

Common Clinical Scenarios

Patients may require disease-modifying antirheumatic drugs (DMARDs) or biologics to manage systemic symptoms and joint inflammation.

Billing Considerations

Rheumatologists must document the extent of systemic involvement and monitor for complications such as infections due to leukopenia.

Physical Medicine

Documentation Requirements

Functional assessments should evaluate the patient's ability to perform activities of daily living (ADLs) and mobility, including the use of assistive devices.

Common Clinical Scenarios

Rehabilitation may focus on restoring function and managing pain through physical therapy, orthotics, and adaptive strategies.

Billing Considerations

Documentation should address mobility limitations and the need for ongoing rehabilitation services.

Coding Guidelines

Inclusion Criteria

Use M05.07 When
  • 10 coding guidelines for M05
  • 07 require documentation of laterality (if applicable), severity of joint involvement, and the type of encounter (initial, follow
  • up, etc

Exclusion Criteria

Do NOT use M05.07 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 aspiration in patients with Felty's syndrome experiencing joint effusion.

Documentation Requirements

Document the joint involved, indication for the procedure, and any findings during aspiration.

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 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, enabling 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, enabling 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, splenomegaly, leukopenia, and systemic symptoms such as fatigue and malaise. Joint involvement typically affects the ankles and feet, leading to functional limitations.