2021

  1. ICD-10-CM Codes
    2. ›
  2. M00-M99 Diseases of the musculoskeletal system and connective tissue
    3. ›
  3. M65-M67 Disorders of synovium and tendon
    4. ›
  4. M66- Spontaneous rupture of synovium and tendon
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code M66.37

2021 ICD-10-CM Diagnosis Code M66.37

Spontaneous rupture of flexor tendons, ankle and foot

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • M66.37 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM M66.37 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of M66.37 - other international versions of ICD-10 M66.37 may differ.
The following code(s) above M66.37 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 M66.37:
  • 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
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 M66.37:
  • Rupture, ruptured
    • tendon (traumatic) - see Strain
      • nontraumatic (spontaneous) M66.9
        ICD-10-CM Diagnosis Code M66.9

        Spontaneous rupture of unspecified tendon

          2016 2017 2018 2019 2020 2021 Billable/Specific Code
        Applicable To
        • Rupture at musculotendinous junction, nontraumatic
        • flexor M66.30
          ICD-10-CM Diagnosis Code M66.30

          Spontaneous rupture of flexor tendons, unspecified site

            2016 2017 2018 2019 2020 2021 Billable/Specific Code
          • ankle M66.37-
          • foot M66.37-

ICD-10-CM Codes Adjacent To M66.37
M66.342 Spontaneous rupture of flexor tendons, left hand
M66.349 Spontaneous rupture of flexor tendons, unspecified hand
M66.35 Spontaneous rupture of flexor tendons, thigh
M66.351 Spontaneous rupture of flexor tendons, right thigh
M66.352 Spontaneous rupture of flexor tendons, left thigh
M66.359 Spontaneous rupture of flexor tendons, unspecified thigh
M66.36 Spontaneous rupture of flexor tendons, lower leg
M66.361 Spontaneous rupture of flexor tendons, right lower leg
M66.362 Spontaneous rupture of flexor tendons, left lower leg
M66.369 Spontaneous rupture of flexor tendons, unspecified lower leg
M66.37 Spontaneous rupture of flexor tendons, ankle and foot
M66.371 Spontaneous rupture of flexor tendons, right ankle and foot
M66.372 Spontaneous rupture of flexor tendons, left ankle and foot
M66.379 Spontaneous rupture of flexor tendons, unspecified ankle and foot
M66.38 …… other site
M66.39 …… multiple sites
M66.8 Spontaneous rupture of other tendons
M66.80 …… unspecified site
M66.81 Spontaneous rupture of other tendons, shoulder
M66.811 Spontaneous rupture of other tendons, right shoulder
M66.812 Spontaneous rupture of other tendons, left shoulder

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

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