ICD-10-CM · Chapter 13 · M00-M99
M66 Spontaneous rupture of synovium and tendon
Includes
- rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excludes 2 (not included here)
- rotator cuff syndrome (M75.1-)
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| M66..0 | Rupture of popliteal cyst | Yes |
| M66..1 | Rupture of synovium | No |
| M66..10 | Rupture of synovium, unspecified joint | Yes |
| M66..11 | Rupture of synovium, shoulder | No |
| M66..111 | Rupture of synovium, right shoulder | Yes |
| M66..112 | Rupture of synovium, left shoulder | Yes |
| M66..119 | Rupture of synovium, unspecified shoulder | Yes |
| M66..12 | Rupture of synovium, elbow | No |
| M66..121 | Rupture of synovium, right elbow | Yes |
| M66..122 | Rupture of synovium, left elbow | Yes |
| M66..129 | Rupture of synovium, unspecified elbow | Yes |
| M66..13 | Rupture of synovium, wrist | No |
| M66..131 | Rupture of synovium, right wrist | Yes |
| M66..132 | Rupture of synovium, left wrist | Yes |
| M66..139 | Rupture of synovium, unspecified wrist | Yes |
| M66..14 | Rupture of synovium, hand and fingers | No |
| M66..141 | Rupture of synovium, right hand | Yes |
| M66..142 | Rupture of synovium, left hand | Yes |
| M66..143 | Rupture of synovium, unspecified hand | Yes |
| M66..144 | Rupture of synovium, right finger(s) | Yes |
| M66..145 | Rupture of synovium, left finger(s) | Yes |
| M66..146 | Rupture of synovium, unspecified finger(s) | Yes |
| M66..15 | Rupture of synovium, hip | No |
| M66..151 | Rupture of synovium, right hip | Yes |
| M66..152 | Rupture of synovium, left hip | Yes |
| M66..159 | Rupture of synovium, unspecified hip | Yes |
| M66..17 | Rupture of synovium, ankle, foot and toes | No |
| M66..171 | Rupture of synovium, right ankle | Yes |
| M66..172 | Rupture of synovium, left ankle | Yes |
| M66..173 | Rupture of synovium, unspecified ankle | Yes |
| M66..174 | Rupture of synovium, right foot | Yes |
| M66..175 | Rupture of synovium, left foot | Yes |
| M66..176 | Rupture of synovium, unspecified foot | Yes |
| M66..177 | Rupture of synovium, right toe(s) | Yes |
| M66..178 | Rupture of synovium, left toe(s) | Yes |
| M66..179 | Rupture of synovium, unspecified toe(s) | Yes |
| M66..18 | Rupture of synovium, other site | Yes |
| M66..2 | Spontaneous rupture of extensor tendons | No |
| M66..20 | Spontaneous rupture of extensor tendons, unspecified site | Yes |
| M66..21 | Spontaneous rupture of extensor tendons, shoulder | No |
| M66..211 | Spontaneous rupture of extensor tendons, right shoulder | Yes |
| M66..212 | Spontaneous rupture of extensor tendons, left shoulder | Yes |
| M66..219 | Spontaneous rupture of extensor tendons, unspecified shoulder | Yes |
| M66..22 | Spontaneous rupture of extensor tendons, upper arm | No |
| M66..221 | Spontaneous rupture of extensor tendons, right upper arm | Yes |
| M66..222 | Spontaneous rupture of extensor tendons, left upper arm | Yes |
| M66..229 | Spontaneous rupture of extensor tendons, unspecified upper arm | Yes |
| M66..23 | Spontaneous rupture of extensor tendons, forearm | No |
| M66..231 | Spontaneous rupture of extensor tendons, right forearm | Yes |
| M66..232 | Spontaneous rupture of extensor tendons, left forearm | Yes |
| M66..239 | Spontaneous rupture of extensor tendons, unspecified forearm | Yes |
| M66..24 | Spontaneous rupture of extensor tendons, hand | No |
| M66..241 | Spontaneous rupture of extensor tendons, right hand | Yes |
| M66..242 | Spontaneous rupture of extensor tendons, left hand | Yes |
| M66..249 | Spontaneous rupture of extensor tendons, unspecified hand | Yes |
| M66..25 | Spontaneous rupture of extensor tendons, thigh | No |
| M66..251 | Spontaneous rupture of extensor tendons, right thigh | Yes |
| M66..252 | Spontaneous rupture of extensor tendons, left thigh | Yes |
| M66..259 | Spontaneous rupture of extensor tendons, unspecified thigh | Yes |
| M66..26 | Spontaneous rupture of extensor tendons, lower leg | No |
| M66..261 | Spontaneous rupture of extensor tendons, right lower leg | Yes |
| M66..262 | Spontaneous rupture of extensor tendons, left lower leg | Yes |
| M66..269 | Spontaneous rupture of extensor tendons, unspecified lower leg | Yes |
| M66..27 | Spontaneous rupture of extensor tendons, ankle and foot | No |
| M66..271 | Spontaneous rupture of extensor tendons, right ankle and foot | Yes |
| M66..272 | Spontaneous rupture of extensor tendons, left ankle and foot | Yes |
| M66..279 | Spontaneous rupture of extensor tendons, unspecified ankle and foot | Yes |
| M66..28 | Spontaneous rupture of extensor tendons, other site | Yes |
| M66..29 | Spontaneous rupture of extensor tendons, multiple sites | Yes |
| M66..3 | Spontaneous rupture of flexor tendons | No |
| M66..30 | Spontaneous rupture of flexor tendons, unspecified site | Yes |
| M66..31 | Spontaneous rupture of flexor tendons, shoulder | No |
| M66..311 | Spontaneous rupture of flexor tendons, right shoulder | Yes |
| M66..312 | Spontaneous rupture of flexor tendons, left shoulder | Yes |
| M66..319 | Spontaneous rupture of flexor tendons, unspecified shoulder | Yes |
| M66..32 | Spontaneous rupture of flexor tendons, upper arm | No |
| M66..321 | Spontaneous rupture of flexor tendons, right upper arm | Yes |
| M66..322 | Spontaneous rupture of flexor tendons, left upper arm | Yes |
| M66..329 | Spontaneous rupture of flexor tendons, unspecified upper arm | Yes |
| M66..33 | Spontaneous rupture of flexor tendons, forearm | No |
| M66..331 | Spontaneous rupture of flexor tendons, right forearm | Yes |
| M66..332 | Spontaneous rupture of flexor tendons, left forearm | Yes |
| M66..339 | Spontaneous rupture of flexor tendons, unspecified forearm | Yes |
| M66..34 | Spontaneous rupture of flexor tendons, hand | No |
| M66..341 | Spontaneous rupture of flexor tendons, right hand | Yes |
| M66..342 | Spontaneous rupture of flexor tendons, left hand | Yes |
| M66..349 | Spontaneous rupture of flexor tendons, unspecified hand | Yes |
| M66..35 | Spontaneous rupture of flexor tendons, thigh | No |
| M66..351 | Spontaneous rupture of flexor tendons, right thigh | Yes |
| M66..352 | Spontaneous rupture of flexor tendons, left thigh | Yes |
| M66..359 | Spontaneous rupture of flexor tendons, unspecified thigh | Yes |
| M66..36 | Spontaneous rupture of flexor tendons, lower leg | No |
| M66..361 | Spontaneous rupture of flexor tendons, right lower leg | Yes |
| M66..362 | Spontaneous rupture of flexor tendons, left lower leg | Yes |
| M66..369 | Spontaneous rupture of flexor tendons, unspecified lower leg | Yes |
| M66..37 | Spontaneous rupture of flexor tendons, ankle and foot | No |
| M66..371 | Spontaneous rupture of flexor tendons, right ankle and foot | Yes |
| M66..372 | Spontaneous rupture of flexor tendons, left ankle and foot | Yes |
| M66..379 | Spontaneous rupture of flexor tendons, unspecified ankle and foot | Yes |
| M66..38 | Spontaneous rupture of flexor tendons, other site | Yes |
| M66..39 | Spontaneous rupture of flexor tendons, multiple sites | Yes |
| M66..8 | Spontaneous rupture of other tendons | No |
| M66..80 | Spontaneous rupture of other tendons, unspecified site | Yes |
| M66..81 | Spontaneous rupture of other tendons, shoulder | No |
| M66..811 | Spontaneous rupture of other tendons, right shoulder | Yes |
| M66..812 | Spontaneous rupture of other tendons, left shoulder | Yes |
| M66..819 | Spontaneous rupture of other tendons, unspecified shoulder | Yes |
| M66..82 | Spontaneous rupture of other tendons, upper arm | No |
| M66..821 | Spontaneous rupture of other tendons, right upper arm | Yes |
| M66..822 | Spontaneous rupture of other tendons, left upper arm | Yes |
| M66..829 | Spontaneous rupture of other tendons, unspecified upper arm | Yes |
| M66..83 | Spontaneous rupture of other tendons, forearm | No |
| M66..831 | Spontaneous rupture of other tendons, right forearm | Yes |
| M66..832 | Spontaneous rupture of other tendons, left forearm | Yes |
| M66..839 | Spontaneous rupture of other tendons, unspecified forearm | Yes |
| M66..84 | Spontaneous rupture of other tendons, hand | No |
| M66..841 | Spontaneous rupture of other tendons, right hand | Yes |
| M66..842 | Spontaneous rupture of other tendons, left hand | Yes |
| M66..849 | Spontaneous rupture of other tendons, unspecified hand | Yes |
| M66..85 | Spontaneous rupture of other tendons, thigh | No |
| M66..851 | Spontaneous rupture of other tendons, right thigh | Yes |
| M66..852 | Spontaneous rupture of other tendons, left thigh | Yes |
| M66..859 | Spontaneous rupture of other tendons, unspecified thigh | Yes |
| M66..86 | Spontaneous rupture of other tendons, lower leg | No |
| M66..861 | Spontaneous rupture of other tendons, right lower leg | Yes |
| M66..862 | Spontaneous rupture of other tendons, left lower leg | Yes |
| M66..869 | Spontaneous rupture of other tendons, unspecified lower leg | Yes |
| M66..87 | Spontaneous rupture of other tendons, ankle and foot | No |
| M66..871 | Spontaneous rupture of other tendons, right ankle and foot | Yes |
| M66..872 | Spontaneous rupture of other tendons, left ankle and foot | Yes |
| M66..879 | Spontaneous rupture of other tendons, unspecified ankle and foot | Yes |
| M66..88 | Spontaneous rupture of other tendons, other sites | Yes |
| M66..89 | Spontaneous rupture of other tendons, multiple sites | Yes |
| M66..9 | Spontaneous rupture of unspecified tendon | Yes |
Last reviewed: September 2026