2021 ICD-10-CM Diagnosis Code M22.4

Chondromalacia patellae

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • M22.4 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 M22.4 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of M22.4 - other international versions of ICD-10 M22.4 may differ.
The following code(s) above M22.4 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 M22.4:
  • 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
  • M20-M25
    2021 ICD-10-CM Range M20-M25

    Other joint disorders

    Type 2 Excludes
    Other joint disorders
  • M22
    ICD-10-CM Diagnosis Code M22

    Disorder of patella

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • traumatic dislocation of patella (S83.0-)
    Disorder of patella
Clinical Information
  • A degeneration of the articular cartilage of the patella, caused by a decrease in sulfated mucopolysaccharides in the ground substance. When accompanied by pain, it is sometimes considered part of or confused with patellofemoral pain syndrome.
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
Code annotations containing back-references to M22.4:
  • Type 1 Excludes: M94.2
    ICD-10-CM Diagnosis Code M94.2

    Chondromalacia

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • chondromalacia patellae (M22.4)

Diagnosis Index entries containing back-references to M22.4:
  • Chondromalacia (systemic) M94.20
    ICD-10-CM Diagnosis Code M94.20

    Chondromalacia, unspecified site

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    • knee M94.26-
      ICD-10-CM Diagnosis Code M94.26-

      Chondromalacia, knee

        2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
      • patella M22.4-
    • patella M22.4-
  • Softening
    • cartilage M94.2-
      ICD-10-CM Diagnosis Code M94.2-

      Chondromalacia

        2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
      Type 1 Excludes
      • chondromalacia patellae (M22.4)
      • patella M22.4-

ICD-10-CM Codes Adjacent To M22.4
M22.2 Patellofemoral disorders
M22.2X Patellofemoral disorders
M22.2X1 …… right knee
M22.2X2 …… left knee
M22.2X9 …… unspecified knee
M22.3 Other derangements of patella
M22.3X Other derangements of patella
M22.3X1 …… right knee
M22.3X2 …… left knee
M22.3X9 …… unspecified knee
M22.4 Chondromalacia patellae
M22.40 …… unspecified knee
M22.41 …… right knee
M22.42 …… left knee
M22.8 Other disorders of patella
M22.8X Other disorders of patella
M22.8X1 …… right knee
M22.8X2 …… left knee
M22.8X9 …… unspecified knee
M22.9 Unspecified disorder of patella
M22.90 …… unspecified knee

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