M66.3 - Spontaneous rupture of flexor tendons
M66.36 - Spontaneous rupture of flexor tendons, lower leg
M66.361 - Spontaneous rupture of flexor tendons, right lower leg
M66.362 - Spontaneous rupture of flexor tendons, left lower leg
M66.369 - Spontaneous rupture of flexor tendons, unspecified lower leg