M66.2 - Spontaneous rupture of extensor tendons
M66.26 - Spontaneous rupture of extensor tendons, lower leg
M66.261 - Spontaneous rupture of extensor tendons, right lower leg
M66.262 - Spontaneous rupture of extensor tendons, left lower leg
M66.269 - Spontaneous rupture of extensor tendons, unspecified lower leg