ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.3 M66.3 Spontaneous rupture of flexor tendons Non-Billable/Non-Specific Codes M66.30Spontaneous rupture of flexor tendons, unspecified siteM66.31Spontaneous rupture of flexor tendons, shoulderM66.311Spontaneous rupture of flexor tendons, right shoulderM66.312Spontaneous rupture of flexor tendons, left shoulderM66.319Spontaneous rupture of flexor tendons, unspecified shoulderM66.32Spontaneous rupture of flexor tendons, upper armM66.321Spontaneous rupture of flexor tendons, right upper armM66.322Spontaneous rupture of flexor tendons, left upper armM66.329Spontaneous rupture of flexor tendons, unspecified upper armM66.33Spontaneous rupture of flexor tendons, forearmM66.331Spontaneous rupture of flexor tendons, right forearmM66.332Spontaneous rupture of flexor tendons, left forearmM66.339Spontaneous rupture of flexor tendons, unspecified forearmM66.34Spontaneous rupture of flexor tendons, handM66.341Spontaneous rupture of flexor tendons, right handM66.342Spontaneous rupture of flexor tendons, left handM66.349Spontaneous rupture of flexor tendons, unspecified handM66.35Spontaneous rupture of flexor tendons, thighM66.351Spontaneous rupture of flexor tendons, right thighM66.352Spontaneous rupture of flexor tendons, left thighM66.359Spontaneous rupture of flexor tendons, unspecified thighM66.36Spontaneous rupture of flexor tendons, lower legM66.361Spontaneous rupture of flexor tendons, right lower legM66.362Spontaneous rupture of flexor tendons, left lower legM66.369Spontaneous rupture of flexor tendons, unspecified lower legM66.37Spontaneous rupture of flexor tendons, ankle and footM66.371Spontaneous rupture of flexor tendons, right ankle and footM66.372Spontaneous rupture of flexor tendons, left ankle and footM66.379Spontaneous rupture of flexor tendons, unspecified ankle and footM66.38Spontaneous rupture of flexor tendons, other siteM66.39Spontaneous rupture of flexor tendons, multiple sites