ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.2 M66.2 Spontaneous rupture of extensor tendons Non-Billable/Non-Specific Codes M66.20Spontaneous rupture of extensor tendons, unspecified siteM66.21Spontaneous rupture of extensor tendons, shoulderM66.211Spontaneous rupture of extensor tendons, right shoulderM66.212Spontaneous rupture of extensor tendons, left shoulderM66.219Spontaneous rupture of extensor tendons, unspecified shoulderM66.22Spontaneous rupture of extensor tendons, upper armM66.221Spontaneous rupture of extensor tendons, right upper armM66.222Spontaneous rupture of extensor tendons, left upper armM66.229Spontaneous rupture of extensor tendons, unspecified upper armM66.23Spontaneous rupture of extensor tendons, forearmM66.231Spontaneous rupture of extensor tendons, right forearmM66.232Spontaneous rupture of extensor tendons, left forearmM66.239Spontaneous rupture of extensor tendons, unspecified forearmM66.24Spontaneous rupture of extensor tendons, handM66.241Spontaneous rupture of extensor tendons, right handM66.242Spontaneous rupture of extensor tendons, left handM66.249Spontaneous rupture of extensor tendons, unspecified handM66.25Spontaneous rupture of extensor tendons, thighM66.251Spontaneous rupture of extensor tendons, right thighM66.252Spontaneous rupture of extensor tendons, left thighM66.259Spontaneous rupture of extensor tendons, unspecified thighM66.26Spontaneous rupture of extensor tendons, lower legM66.261Spontaneous rupture of extensor tendons, right lower legM66.262Spontaneous rupture of extensor tendons, left lower legM66.269Spontaneous rupture of extensor tendons, unspecified lower legM66.27Spontaneous rupture of extensor tendons, ankle and footM66.271Spontaneous rupture of extensor tendons, right ankle and footM66.272Spontaneous rupture of extensor tendons, left ankle and footM66.279Spontaneous rupture of extensor tendons, unspecified ankle and footM66.28Spontaneous rupture of extensor tendons, other siteM66.29Spontaneous rupture of extensor tendons, multiple sites