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ICD-10 Guide
ICD-10 CodesM05.45

M05.45

Billable

Rheumatoid myopathy with rheumatoid arthritis of hip

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

Code Description

ICD-10 M05.45 is a billable code used to indicate a diagnosis of rheumatoid myopathy with rheumatoid arthritis of hip.

Key Diagnostic Point:

Rheumatoid myopathy is a condition characterized by muscle weakness and pain associated with rheumatoid arthritis (RA), an autoimmune disorder that primarily affects the joints. In this case, the hip joint is involved, leading to significant functional impairment. The hip joint, a ball-and-socket joint formed by the acetabulum of the pelvis and the head of the femur, is crucial for weight-bearing and mobility. In rheumatoid arthritis, inflammation of the synovial membrane leads to joint swelling, pain, and eventual erosion of cartilage and bone. Myopathy in this context refers to muscle inflammation and weakness, which can occur due to the systemic effects of RA or as a side effect of medications used to treat the disease. Clinically, patients may present with difficulty in hip movement, pain during weight-bearing activities, and overall reduced mobility. The combination of joint and muscle involvement complicates the clinical picture, necessitating a multidisciplinary approach to management.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Involvement of multiple anatomical structures (hip joint and surrounding musculature)
  • Need for precise documentation of joint and muscle symptoms
  • Potential for overlapping diagnoses (e.g., myopathy vs. arthritis)
  • Variability in clinical presentation and severity

Audit Risk Factors

  • Inadequate documentation of muscle weakness or pain
  • Failure to specify laterality of hip involvement
  • Misclassification of myopathy as a separate condition
  • Insufficient evidence of rheumatoid arthritis diagnosis

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

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

Common Clinical Scenarios

Common scenarios include surgical interventions such as hip arthroplasty or joint injections for pain management.

Billing Considerations

Joint-specific considerations include the degree of joint erosion and the impact on mobility, which must be documented to justify surgical options.

Rheumatology

Documentation Requirements

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

Common Clinical Scenarios

Autoimmune scenarios often involve adjusting medication regimens to manage both arthritis and myopathy symptoms.

Billing Considerations

Systemic involvement may necessitate monitoring for extra-articular manifestations of RA, which should be documented.

Physical Medicine

Documentation Requirements

Functional assessments should evaluate the patient's ability to perform daily activities and the need for rehabilitation services.

Common Clinical Scenarios

Rehabilitation scenarios may include physical therapy to improve strength and mobility post-therapy or surgery.

Billing Considerations

Mobility limitations may require documentation of assistive devices (e.g., walkers, canes) to support patient independence.

Coding Guidelines

Inclusion Criteria

Use M05.45 When
  • Official coding guidelines require specificity in documenting laterality (e
  • , right or left hip) and severity of the condition
  • Encounter type (initial, follow
  • up) must also be documented to ensure accurate coding

Exclusion Criteria

Do NOT use M05.45 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 pain management in patients with RA and myopathy.

Documentation Requirements

Document the joint involved, indication for the procedure, and any imaging guidance used.

Specialty Considerations

Orthopedic and rheumatologic considerations include the need for joint stability and monitoring of inflammatory markers.

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. M05.45 reflects the complexity of managing both rheumatoid arthritis and myopathy, which was less clearly defined in ICD-9.

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. M05.45 reflects the complexity of managing both rheumatoid arthritis and myopathy, which was less clearly defined in ICD-9.

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. M05.45 reflects the complexity of managing both rheumatoid arthritis and myopathy, which was less clearly defined in ICD-9.

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 M05.45?

Key documentation includes detailed descriptions of joint involvement, muscle weakness, treatment plans, and any imaging or laboratory results that support the diagnosis of rheumatoid arthritis and myopathy.