2020 ICD-10-CM Diagnosis Code M25.46

Effusion, knee

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M25.46 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 M25.46 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M25.46 - other international versions of ICD-10 M25.46 may differ.
The following code(s) above M25.46 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 M25.46:
  • M00-M99
    2020 ICD-10-CM Range M00-M99

    Diseases of the musculoskeletal system and connective tissue

    • 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
  • M25
    ICD-10-CM Diagnosis Code M25

    Other joint disorder, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • abnormality of gait and mobility (R26.-)
    • acquired deformities of limb (M20-M21)
    • calcification of bursa (M71.4-)
    • calcification of shoulder (joint) (M75.3)
    • calcification of tendon (M65.2-)
    • difficulty in walking (R26.2)
    • temporomandibular joint disorder (M26.6-)
    Other joint disorder, not elsewhere classified
  • M25.4
    ICD-10-CM Diagnosis Code M25.4

    Effusion of joint

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • hydrarthrosis in yaws (A66.6)
    • intermittent hydrarthrosis (M12.4-)
    • other infective (teno)synovitis (M65.1-)
    Effusion 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

Diagnosis Index entries containing back-references to M25.46:
  • Effusion
    • joint M25.40
      ICD-10-CM Diagnosis Code M25.40

      Effusion, unspecified joint

        2016 2017 2018 2019 2020 Billable/Specific Code
      • knee M25.46-

ICD-10-CM Codes Adjacent To M25.46
M25.432 Effusion, left wrist
M25.439 Effusion, unspecified wrist
M25.44 Effusion, hand
M25.441 Effusion, right hand
M25.442 Effusion, left hand
M25.449 Effusion, unspecified hand
M25.45 Effusion, hip
M25.451 Effusion, right hip
M25.452 Effusion, left hip
M25.459 Effusion, unspecified hip
M25.46 Effusion, knee
M25.461 Effusion, right knee
M25.462 Effusion, left knee
M25.469 Effusion, unspecified knee
M25.47 Effusion, ankle and foot
M25.471 Effusion, right ankle
M25.472 Effusion, left ankle
M25.473 Effusion, unspecified ankle
M25.474 Effusion, right foot
M25.475 Effusion, left foot
M25.476 Effusion, unspecified foot

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