Spontaneous rupture of other tendons, right hand

This diagnosis code signifies the non-traumatic tearing or breaking of a tendon in the right hand, excluding those specifically categorized elsewhere (e.g., rotator cuff, Achilles). This rupture occurs without an external force or injury, often due to underlying degenerative changes, inflammatory conditions, or chronic overuse.

Use this code when documentation clearly indicates a spontaneous (non-traumatic) rupture of any tendon in the right hand other than those with more specific ICD-10-CM codes. This applies to conditions like spontaneous extensor or flexor tendon ruptures in the hand, often seen in patients with rheumatoid arthritis or Kienbock's disease.

• Ensure the documentation specifies "spontaneous" or "non-traumatic" to differentiate from traumatic ruptures.
• Verify the laterality is explicitly stated as "right hand."
• If the specific tendon is identified (e.g., extensor pollicis longus), ensure it's not covered by a more precise code within the M66 category or other relevant chapters.