2022 ICD-10-CM Diagnosis Code M23.40

Loose body in knee, unspecified knee

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • M23.40 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM M23.40 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of M23.40 - other international versions of ICD-10 M23.40 may differ.
The following code(s) above M23.40 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 M23.40:
  • M00-M99
    2022 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
    2022 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 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    • current injury - see injury of knee and lower leg (S80-S89)
    • recurrent dislocation or subluxation of joints (M24.4)
    • recurrent dislocation or subluxation of patella (M22.0-M22.1)
    Internal derangement of knee
Approximate Synonyms
  • Loose body in knee
ICD-10-CM M23.40 is grouped within Diagnostic Related Group(s) (MS-DRG v39.0):
  • 564 Other musculoskeletal system and connective tissue diagnoses with mcc
  • 565 Other musculoskeletal system and connective tissue diagnoses with cc
  • 566 Other musculoskeletal system and connective tissue diagnoses without cc/mcc

Convert M23.40 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
  • 2022 (effective 10/1/2021): No change
ICD-10-CM Codes Adjacent To M23.40
M23.349 …… unspecified knee
M23.35 Other meniscus derangements, posterior horn of lateral meniscus
M23.351 …… right knee
M23.352 …… left knee
M23.359 …… unspecified knee
M23.36 Other meniscus derangements, other lateral meniscus
M23.361 …… right knee
M23.362 …… left knee
M23.369 …… unspecified knee
M23.4 Loose body in knee
M23.40 …… unspecified knee
M23.41 …… right knee
M23.42 …… left knee
M23.5 Chronic instability of knee
M23.50 …… unspecified knee
M23.51 …… right knee
M23.52 …… left knee
M23.6 Other spontaneous disruption of ligament(s) of knee
M23.60 Other spontaneous disruption of unspecified ligament of knee
M23.601 Other spontaneous disruption of unspecified ligament of right knee
M23.602 Other spontaneous disruption of unspecified ligament of left knee

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