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ICD-10 Guide
ICD-10 CodesM05.471

M05.471

Billable

Rheumatoid myopathy with rheumatoid arthritis of right ankle and foot

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

Code Description

ICD-10 M05.471 is a billable code used to indicate a diagnosis of rheumatoid myopathy with rheumatoid arthritis of right ankle and foot.

Key Diagnostic Point:

Rheumatoid myopathy is a complication of rheumatoid arthritis (RA) characterized by muscle weakness and pain due to inflammation of muscle tissue. In this case, it is associated with rheumatoid arthritis affecting the right ankle and foot. Anatomically, the right ankle consists of the tibia, fibula, and talus, with surrounding ligaments, tendons, and muscles that facilitate movement. The foot comprises 26 bones, including the tarsals, metatarsals, and phalanges, which are crucial for weight-bearing and mobility. Clinically, patients may present with joint swelling, tenderness, and decreased range of motion in the ankle and foot, leading to functional limitations in ambulation and daily activities. The pathophysiology involves autoimmune-mediated inflammation, resulting in synovitis and subsequent joint damage, which can lead to myopathy due to disuse and muscle atrophy.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Involvement of multiple anatomical structures (muscles, joints, tendons)
  • Need for precise documentation of laterality and specific joint involvement
  • Differentiation from other forms of myopathy and arthritis
  • Potential for systemic involvement complicating the clinical picture

Audit Risk Factors

  • Inadequate documentation of muscle weakness or myopathy symptoms
  • Failure to specify laterality of joint involvement
  • Lack of evidence for rheumatoid arthritis diagnosis
  • Insufficient detail on functional limitations affecting daily activities

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Orthopedic documentation should include imaging studies (X-rays, MRIs) to assess joint integrity and functional assessments to evaluate mobility.

Common Clinical Scenarios

Common scenarios include surgical interventions for joint repair or replacement due to severe arthritis.

Billing Considerations

Joint-specific considerations include documenting the extent of joint damage and any surgical history.

Rheumatology

Documentation Requirements

Rheumatologic documentation must include laboratory tests for inflammatory markers (e.g., ESR, CRP) and assessments of disease activity (e.g., DAS28).

Common Clinical Scenarios

Scenarios often involve managing systemic symptoms and adjusting DMARD therapy based on disease progression.

Billing Considerations

Considerations include monitoring for systemic involvement and comorbidities associated with RA.

Physical Medicine

Documentation Requirements

Functional assessments should document mobility limitations, pain levels, and rehabilitation goals.

Common Clinical Scenarios

Rehabilitation scenarios may involve physical therapy to improve strength and function post-inflammation.

Billing Considerations

Consider mobility aids and assistive devices that may be necessary for patient support.

Coding Guidelines

Inclusion Criteria

Use M05.471 When
  • Follow official coding guidelines for laterality (right ankle and foot), severity of the condition, and the type of encounter (initial, follow
  • up, or acute)
  • Ensure that documentation supports the diagnosis and any associated conditions

Exclusion Criteria

Do NOT use M05.471 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

97001CPT Code

Physical therapy evaluation

Clinical Scenario

Used for assessing functional limitations and developing a rehabilitation plan.

Documentation Requirements

Document the patient's functional status, mobility limitations, and treatment goals.

Specialty Considerations

Considerations for physical therapy include the patient's overall health and comorbidities.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

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

ICD-9 vs ICD-10

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

Reimbursement & Billing Impact

The transition to ICD-10 has increased specificity in coding musculoskeletal conditions, allowing for 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 symptoms of rheumatoid myopathy?

Key symptoms include muscle weakness, pain, and fatigue, particularly in proximal muscles, which can significantly impact mobility and daily activities.