M66.3 - Spontaneous rupture of flexor tendons
M66.32 - Spontaneous rupture of flexor tendons, upper arm
M66.321 - Spontaneous rupture of flexor tendons, right upper arm
M66.322 - Spontaneous rupture of flexor tendons, left upper arm
M66.329 - Spontaneous rupture of flexor tendons, unspecified upper arm