Spontaneous rupture of other tendons, left lower leg

📋Clinical Description

This code signifies the non-traumatic tearing or breaking of a tendon in the left lower leg, excluding the Achilles tendon, without an external force or injury. It represents a sudden, unprovoked separation of tendon fibers.

🎯When to Use

Apply this code when documentation specifies a spontaneous rupture of a tendon in the left lower leg, such as the tibialis posterior or peroneal tendons, without an acute injury. The physician's notes should clearly indicate "spontaneous" or "atraumatic" rupture.

💡Coding Tips

Differentiate from traumatic ruptures (S86.- codes) which involve an external force.
Ensure laterality (left) and anatomical site (lower leg, excluding Achilles) are explicitly documented.
Do not use for Achilles tendon ruptures; refer to M66.861 or M66.869 for those specific sites.

AI-generated reference — verify against official guidelines

Code Hierarchy

▲M66.86Spontaneous rupture of other tendons, lower leg

M66.862(current)

Crosswalks

727.67ApproxICD-9

Same Category

M66Spontaneous rupture of synovium and tendon M66.0Rupture of popliteal cyst M66.1Rupture of synovium M66.10Rupture of synovium, unspecified joint M66.11Rupture of synovium, shoulder