Rheumatoid myopathy with rheumatoid arthritis of left knee

📋Clinical Description

This code signifies a muscular disorder (myopathy) directly caused by or associated with rheumatoid arthritis, specifically affecting the left knee. It indicates a systemic inflammatory process impacting both joints and muscle tissue in a localized area.

🎯When to Use

Apply this code when documentation clearly states "rheumatoid myopathy" or "myopathy due to rheumatoid arthritis" and specifies involvement of the left knee. This diagnosis requires a confirmed diagnosis of rheumatoid arthritis as the underlying cause of the myopathy.

💡Coding Tips

Ensure documentation specifies "rheumatoid" myopathy, not just general myopathy.
Verify the laterality (left knee) is explicitly stated in the medical record.
Always code the underlying rheumatoid arthritis (e.g., M05.xx) as the primary diagnosis, followed by this code.

AI-generated reference — verify against official guidelines

Code Hierarchy

▲M05.46Rheumatoid myopathy with rheumatoid arthritis of knee

M05.462(current)

Crosswalks

714.01-to-manyICD-9 359.61-to-manyICD-9

Same Category

M05Rheumatoid arthritis with rheumatoid factor M05.0Felty's syndrome M05.00Felty's syndrome, unspecified site M05.01Felty's syndrome, shoulder