2020 ICD-10-CM Diagnosis Code M23.9

Unspecified internal derangement of knee

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M23.9 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 M23.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M23.9 - other international versions of ICD-10 M23.9 may differ.
The following code(s) above M23.9 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 M23.9:
  • 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
  • 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)
    Internal derangement of knee
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

Diagnosis Index entries containing back-references to M23.9:
  • Derangement
    • joint (internal) M24.9
      ICD-10-CM Diagnosis Code M24.9

      Joint derangement, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • articular cartilage M24.10
        ICD-10-CM Diagnosis Code M24.10

        Other articular cartilage disorders, unspecified site

          2016 2017 2018 2019 2020 Billable/Specific Code
        • knee NEC M23.9-
    • knee (recurrent) M23.9-

ICD-10-CM Codes Adjacent To M23.9
M23.649 Other spontaneous disruption of lateral collateral ligament of unspecified knee
M23.67 Other spontaneous disruption of capsular ligament of knee
M23.671 Other spontaneous disruption of capsular ligament of right knee
M23.672 Other spontaneous disruption of capsular ligament of left knee
M23.679 Other spontaneous disruption of capsular ligament of unspecified knee
M23.8 Other internal derangements of knee
M23.8X Other internal derangements of knee
M23.8X1 Other internal derangements of right knee
M23.8X2 Other internal derangements of left knee
M23.8X9 Other internal derangements of unspecified knee
M23.9 Unspecified internal derangement of knee
M23.90 Unspecified internal derangement of unspecified knee
M23.91 Unspecified internal derangement of right knee
M23.92 Unspecified internal derangement of left knee
M24 Other specific joint derangements
M24.0 Loose body in joint
M24.00 Loose body in unspecified joint
M24.01 Loose body in shoulder
M24.011 Loose body in right shoulder
M24.012 Loose body in left shoulder
M24.019 Loose body in unspecified shoulder

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