2023

  1. ICD-10-CM Codes
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  2. N00-N99
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  3. N60-N65
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  4. N64-
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  5. 2023 ICD-10-CM Diagnosis Code N64.1

2023 ICD-10-CM Diagnosis Code N64.1

Fat necrosis of breast

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • N64.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM N64.1 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of N64.1 - other international versions of ICD-10 N64.1 may differ.
Applicable To
  • Fat necrosis (segmental) of breast
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • breast necrosis due to breast graft (
    ICD-10-CM Diagnosis Code T85.898

    Other specified complication of other internal prosthetic devices, implants and grafts

      2017 - New Code 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    T85.898
    )
The following code(s) above N64.1 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 N64.1:
  • N00-N99
    2023 ICD-10-CM Range N00-N99

    Diseases of the genitourinary system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • 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 genitourinary system
  • N60-N65
    2023 ICD-10-CM Range N60-N65

    Disorders of breast

    Type 1 Excludes
    • disorders of breast associated with childbirth (O91-O92)
    Disorders of breast
  • N64
    ICD-10-CM Diagnosis Code N64

    Other disorders of breast

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • mechanical complication of breast prosthesis and implant (T85.4-)
    Other disorders of breast
Approximate Synonyms
  • Bilateral breast fat necrosis
  • Fat necrosis of bilateral breasts
  • Fat necrosis of left breast
  • Fat necrosis of right breast
  • Left breast fat necrosis
  • Right breast fat necrosis
Clinical Information
  • Localized necrosis of the adipose tissue in the breast. Clinically, it may present as a mass. Causes include injury, surgical procedures, and radiation treatment.
ICD-10-CM N64.1 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 600 Non-malignant breast disorders with cc/mcc
  • 601 Non-malignant breast disorders without cc/mcc

Convert N64.1 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
  • 2023 (effective 10/1/2022): No change

Diagnosis Index entries containing back-references to N64.1:

ICD-10-CM Codes Adjacent To N64.1
N63.24 …… lower inner quadrant
N63.25 …… overlapping quadrants
N63.3 Unspecified lump in axillary tail
N63.31 …… of the right breast
N63.32 …… of the left breast
N63.4 Unspecified lump in breast, subareolar
N63.41 Unspecified lump in right breast, subareolar
N63.42 Unspecified lump in left breast, subareolar
N64 Other disorders of breast
N64.0 Fissure and fistula of nipple
N64.1 Fat necrosis of breast
N64.2 Atrophy of breast
N64.3 Galactorrhea not associated with childbirth
N64.4 Mastodynia
N64.5 Other signs and symptoms in breast
N64.51 Induration of breast
N64.52 Nipple discharge
N64.53 Retraction of nipple
N64.59 Other signs and symptoms in breast
N64.8 Other specified disorders of breast
N64.81 Ptosis of breast

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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