ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.8 > M66.84 M66.84 Spontaneous rupture of other tendons, hand Non-Billable/Non-Specific Codes M66.841Spontaneous rupture of other tendons, right handM66.842Spontaneous rupture of other tendons, left handM66.849Spontaneous rupture of other tendons, unspecified hand