M66 — Spontaneous rupture of synovium and tendon
Not billable
Is M66 billable?
No — M66 is a non-billable header code. M66 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 60 billable codes beneath M66.
Billable codes under this header
- M66.0Rupture of popliteal cyst
- M66.9Spontaneous rupture of unspecified tendon
- M66.10Rupture of synovium, unspecified joint
- M66.18Rupture of synovium, other site
- M66.20Spontaneous rupture of extensor tendons, unspecified site
- M66.28Spontaneous rupture of extensor tendons, other site
- M66.29Spontaneous rupture of extensor tendons, multiple sites
- M66.30Spontaneous rupture of flexor tendons, unspecified site
- M66.38Spontaneous rupture of flexor tendons, other site
- M66.39Spontaneous rupture of flexor tendons, multiple sites
- M66.80Spontaneous rupture of other tendons, unspecified site
- M66.88Spontaneous rupture of other tendons, other sites
- M66.89Spontaneous rupture of other tendons, multiple sites
- M66.111Rupture of synovium, right shoulder
- M66.112Rupture of synovium, left shoulder
- M66.119Rupture of synovium, unspecified shoulder
- M66.121Rupture of synovium, right elbow
- M66.122Rupture of synovium, left elbow
- M66.129Rupture of synovium, unspecified elbow
- M66.131Rupture of synovium, right wrist
- M66.132Rupture of synovium, left wrist
- M66.139Rupture of synovium, unspecified wrist
- M66.141Rupture of synovium, right hand
- M66.142Rupture of synovium, left hand
- M66.143Rupture of synovium, unspecified hand
- M66.144Rupture of synovium, right finger(s)
- M66.145Rupture of synovium, left finger(s)
- M66.146Rupture of synovium, unspecified finger(s)
- M66.151Rupture of synovium, right hip
- M66.152Rupture of synovium, left hip
- M66.159Rupture of synovium, unspecified hip
- M66.171Rupture of synovium, right ankle
- M66.172Rupture of synovium, left ankle
- M66.173Rupture of synovium, unspecified ankle
- M66.174Rupture of synovium, right foot
- M66.175Rupture of synovium, left foot
- M66.176Rupture of synovium, unspecified foot
- M66.177Rupture of synovium, right toe(s)
- M66.178Rupture of synovium, left toe(s)
- M66.179Rupture of synovium, unspecified toe(s)
- M66.211Spontaneous rupture of extensor tendons, right shoulder
- M66.212Spontaneous rupture of extensor tendons, left shoulder
- M66.219Spontaneous rupture of extensor tendons, unspecified shoulder
- M66.221Spontaneous rupture of extensor tendons, right upper arm
- M66.222Spontaneous rupture of extensor tendons, left upper arm
- M66.229Spontaneous rupture of extensor tendons, unspecified upper arm
- M66.231Spontaneous rupture of extensor tendons, right forearm
- M66.232Spontaneous rupture of extensor tendons, left forearm
- M66.239Spontaneous rupture of extensor tendons, unspecified forearm
- M66.241Spontaneous rupture of extensor tendons, right hand
- M66.242Spontaneous rupture of extensor tendons, left hand
- M66.249Spontaneous rupture of extensor tendons, unspecified hand
- M66.251Spontaneous rupture of extensor tendons, right thigh
- M66.252Spontaneous rupture of extensor tendons, left thigh
- M66.259Spontaneous rupture of extensor tendons, unspecified thigh
- M66.261Spontaneous rupture of extensor tendons, right lower leg
- M66.262Spontaneous rupture of extensor tendons, left lower leg
- M66.269Spontaneous rupture of extensor tendons, unspecified lower leg
- M66.271Spontaneous rupture of extensor tendons, right ankle and foot
- M66.272Spontaneous rupture of extensor tendons, left ankle and foot
M66 at a glance
| Code | M66 |
|---|---|
| Description | Spontaneous rupture of synovium and tendon |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of M66, but a patient may have both at the same time. When documentation supports it, M66 and the excluded code may both be reported.
- rotator cuff syndrome (M75.1-)
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Includes
Conditions classified to M66.
- rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M66, but a patient may have both at the same time. When documentation supports it, M66 and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under M66? (6)
How long has M66 existed?
M66 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.