2021 ICD-10-CM Diagnosis Code M66.9

Spontaneous rupture of unspecified tendon

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • M66.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM M66.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of M66.9 - other international versions of ICD-10 M66.9 may differ.
Applicable To
  • Rupture at musculotendinous junction, nontraumatic
The following code(s) above M66.9 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 M66.9:
  • M00-M99
    2021 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 2021 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
Approximate Synonyms
  • Non-traumatic rupture of tendon of left foot
  • Non-traumatic rupture of tendon of right foot
  • Non-traumatic rupture of tendon of right hand
  • Non-traumatic tendon rupture
  • Nontraumatic rupture of tendon
  • Nontraumatic tear of bilateral foot tendons
  • Nontraumatic tear of bilateral forearm tendons
  • Nontraumatic tear of bilateral hand tendons
  • Nontraumatic tear of left foot tendon
  • Nontraumatic tear of left forearm tendon
  • Nontraumatic tear of left hand tendon
  • Nontraumatic tear of right foot tendon
  • Nontraumatic tear of right forearm tendon
  • Nontraumatic tear of right hand tendon
  • Rupture tendon, nontraumatic
ICD-10-CM M66.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 557 Tendonitis, myositis and bursitis with mcc
  • 558 Tendonitis, myositis and bursitis without mcc

Convert M66.9 to ICD-9-CM

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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to M66.9:

ICD-10-CM Codes Adjacent To M66.9
M66.86 Spontaneous rupture of other tendons, lower leg
M66.861 Spontaneous rupture of other tendons, right lower leg
M66.862 Spontaneous rupture of other tendons, left lower leg
M66.869 Spontaneous rupture of other tendons, unspecified lower leg
M66.87 Spontaneous rupture of other tendons, ankle and foot
M66.871 Spontaneous rupture of other tendons, right ankle and foot
M66.872 Spontaneous rupture of other tendons, left ankle and foot
M66.879 Spontaneous rupture of other tendons, unspecified ankle and foot
M66.88 …… other sites
M66.89 …… multiple sites
M66.9 Spontaneous rupture of unspecified tendon
M67 Other disorders of synovium and tendon
M67.0 Short Achilles tendon (acquired)
M67.00 …… unspecified ankle
M67.01 …… right ankle
M67.02 …… left ankle
M67.2 Synovial hypertrophy, not elsewhere classified
M67.20 …… unspecified site
M67.21 Synovial hypertrophy, not elsewhere classified, shoulder
M67.211 Synovial hypertrophy, not elsewhere classified, right shoulder
M67.212 Synovial hypertrophy, not elsewhere classified, left shoulder

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