2020 ICD-10-CM Diagnosis Code M66.1

Rupture of synovium

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M66.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM M66.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M66.1 - other international versions of ICD-10 M66.1 may differ.
Applicable To
  • Rupture of synovial cyst
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (M66.1) and the excluded code together.
  • rupture of popliteal cyst (
    ICD-10-CM Diagnosis Code M66.0

    Rupture of popliteal cyst

      2016 2017 2018 2019 2020 Billable/Specific Code
    M66.0
    )
The following code(s) above M66.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to M66.1:
  • M00-M99
    2020 ICD-10-CM Range M00-M99

    Diseases of the musculoskeletal system and connective tissue

    Note
    • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
    Type 2 Excludes
    • 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)
    Diseases of the musculoskeletal system and connective tissue
  • M66
    ICD-10-CM Diagnosis Code M66

    Spontaneous rupture of synovium and tendon

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
    Type 2 Excludes
    • rotator cuff syndrome (M75.1-)
    • rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
    Spontaneous rupture of synovium and tendon
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to M66.1:
  • Type 1 Excludes: M71.3
    ICD-10-CM Diagnosis Code M71.3

    Other bursal cyst

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Synovial cyst NOS
    Type 1 Excludes
    • synovial cyst with rupture (M66.1-)
ICD-10-CM Codes Adjacent To M66.1
M65.869 Other synovitis and tenosynovitis, unspecified lower leg
M65.87 Other synovitis and tenosynovitis, ankle and foot
M65.871 Other synovitis and tenosynovitis, right ankle and foot
M65.872 Other synovitis and tenosynovitis, left ankle and foot
M65.879 Other synovitis and tenosynovitis, unspecified ankle and foot
M65.88 …… other site
M65.89 …… multiple sites
M65.9 Synovitis and tenosynovitis, unspecified
M66 Spontaneous rupture of synovium and tendon
M66.0 Rupture of popliteal cyst
M66.1 Rupture of synovium
M66.10 …… unspecified joint
M66.11 Rupture of synovium, shoulder
M66.111 Rupture of synovium, right shoulder
M66.112 Rupture of synovium, left shoulder
M66.119 Rupture of synovium, unspecified shoulder
M66.12 Rupture of synovium, elbow
M66.121 Rupture of synovium, right elbow
M66.122 Rupture of synovium, left elbow
M66.129 Rupture of synovium, unspecified elbow
M66.13 Rupture of synovium, wrist

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.