2020 ICD-10-CM Diagnosis Code M24.66

Ankylosis, knee

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M24.66 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 M24.66 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M24.66 - other international versions of ICD-10 M24.66 may differ.
The following code(s) above M24.66 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 M24.66:
  • 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
  • M20-M25
    2020 ICD-10-CM Range M20-M25

    Other joint disorders

    Type 2 Excludes
    Other joint disorders
  • M24
    ICD-10-CM Diagnosis Code M24

    Other specific joint derangements

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • current injury - see injury of joint by body region
    Type 2 Excludes
    Other specific joint derangements
  • M24.6
    ICD-10-CM Diagnosis Code M24.6

    Ankylosis of joint

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • stiffness of joint without ankylosis (M25.6-)
    Type 2 Excludes
    Ankylosis of joint
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 M24.66:
  • Type 1 Excludes: M23
    ICD-10-CM Diagnosis Code M23

    Internal derangement of knee

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • ankylosis (M24.66)
    • current injury - see injury of knee and lower leg (S80-S89)
    • deformity of knee (M21.-)
    • osteochondritis dissecans (M93.2)
    • recurrent dislocation or subluxation of joints (M24.4)
    • recurrent dislocation or subluxation of patella (M22.0-M22.1)

Diagnosis Index entries containing back-references to M24.66:
  • Ankylosis (fibrous) (osseous) (joint) M24.60
    ICD-10-CM Diagnosis Code M24.60

    Ankylosis, unspecified joint

      2016 2017 2018 2019 2020 Billable/Specific Code
    • knee M24.66-

ICD-10-CM Codes Adjacent To M24.66
M24.632 Ankylosis, left wrist
M24.639 Ankylosis, unspecified wrist
M24.64 Ankylosis, hand
M24.641 Ankylosis, right hand
M24.642 Ankylosis, left hand
M24.649 Ankylosis, unspecified hand
M24.65 Ankylosis, hip
M24.651 Ankylosis, right hip
M24.652 Ankylosis, left hip
M24.659 Ankylosis, unspecified hip
M24.66 Ankylosis, knee
M24.661 Ankylosis, right knee
M24.662 Ankylosis, left knee
M24.669 Ankylosis, unspecified knee
M24.67 Ankylosis, ankle and foot
M24.671 Ankylosis, right ankle
M24.672 Ankylosis, left ankle
M24.673 Ankylosis, unspecified ankle
M24.674 Ankylosis, right foot
M24.675 Ankylosis, left foot
M24.676 Ankylosis, unspecified foot

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