ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.8 > M66.81 M66.81 Spontaneous rupture of other tendons, shoulder Non-Billable/Non-Specific Codes M66.811Spontaneous rupture of other tendons, right shoulderM66.812Spontaneous rupture of other tendons, left shoulderM66.819Spontaneous rupture of other tendons, unspecified shoulder