ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.2 > M66.24 M66.24 Spontaneous rupture of extensor tendons, hand Non-Billable/Non-Specific Codes M66.241Spontaneous rupture of extensor tendons, right handM66.242Spontaneous rupture of extensor tendons, left handM66.249Spontaneous rupture of extensor tendons, unspecified hand