2019/2020

  1. ICD-10-CM Codes
    2. ›
  2. M00-M99 Diseases of the musculoskeletal system and connective tissue
    3. ›
  3. M70-M79 Other soft tissue disorders
    4. ›
  4. M79- Other and unspecified soft tissue disorders, not elsewhere classified
    5. ›

2020 ICD-10-CM Diagnosis Code M79.4

Hypertrophy of (infrapatellar) fat pad

    2016 2017 2018 2019 2020 Billable/Specific Code
  • M79.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM M79.4 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M79.4 - other international versions of ICD-10 M79.4 may differ.
The following code(s) above M79.4 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 M79.4:
  • 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
  • M79
    ICD-10-CM Diagnosis Code M79

    Other and unspecified soft tissue disorders, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • psychogenic rheumatism (F45.8)
    • soft tissue pain, psychogenic (F45.41)
    Other and unspecified soft tissue disorders, not elsewhere classified
Approximate Synonyms
  • Hypertrophy of bilateral infrapatellar fat pads
  • Hypertrophy of fat pad of knee
  • Hypertrophy of infrapatellar fat pad
  • Hypertrophy of left infrapatellar fat pad
  • Hypertrophy of right infrapatellar fat pad
ICD-10-CM M79.4 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 606 Minor skin disorders with mcc
  • 607 Minor skin disorders without mcc

Convert M79.4 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

Diagnosis Index entries containing back-references to M79.4:
  • Degeneration, degenerative
    • infrapatellar fat pad M79.4
    • popliteal fat pad M79.4
  • Fat
    • localized (pad) E65
      ICD-10-CM Diagnosis Code E65

      Localized adiposity

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Fat pad
      • knee M79.4
      • retropatellar M79.4
    • pad E65
      ICD-10-CM Diagnosis Code E65

      Localized adiposity

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Fat pad
      • knee M79.4
  • Fibrosis, fibrotic
    • infrapatellar fat pad M79.4
    • popliteal fat pad M79.4
  • Hypertrophy, hypertrophic
    • fat pad E65
      ICD-10-CM Diagnosis Code E65

      Localized adiposity

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Fat pad
      • knee M79.4 (infrapatellar) (popliteal) (prepatellar) (retropatellar)

ICD-10-CM Codes Adjacent To M79.4
M77.9 Enthesopathy, unspecified
M79 Other and unspecified soft tissue disorders, not elsewhere classified
M79.0 Rheumatism, unspecified
M79.1 Myalgia
M79.10 …… unspecified site
M79.11 …… of mastication muscle
M79.12 …… of auxiliary muscles, head and neck
M79.18 …… other site
M79.2 Neuralgia and neuritis, unspecified
M79.3 Panniculitis, unspecified
M79.4 Hypertrophy of (infrapatellar) fat pad
M79.5 Residual foreign body in soft tissue
M79.6 Pain in limb, hand, foot, fingers and toes
M79.60 Pain in limb, unspecified
M79.601 Pain in right arm
M79.602 Pain in left arm
M79.603 Pain in arm, unspecified
M79.604 Pain in right leg
M79.605 Pain in left leg
M79.606 Pain in leg, unspecified
M79.609 Pain in unspecified limb

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

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