2020 ICD-10-CM Diagnosis Code N63.4

Unspecified lump in breast, subareolar

    2018 - New Code 2019 2020 Non-Billable/Non-Specific Code
  • N63.4 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 N63.4 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N63.4 - other international versions of ICD-10 N63.4 may differ.
The following code(s) above N63.4 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 N63.4:
  • N00-N99
    2020 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
    2020 ICD-10-CM Range N60-N65

    Disorders of breast

    Type 1 Excludes
    • disorders of breast associated with childbirth (O91-O92)
    Disorders of breast
  • N63
    ICD-10-CM Diagnosis Code N63

    Unspecified lump in breast

      2016 2017 2018 - Converted to Parent Code 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Nodule(s) NOS in breast
    Unspecified lump in breast
Code History
  • 2018 (effective 10/1/2017): New code
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
ICD-10-CM Codes Adjacent To N63.4
N63.2 Unspecified lump in the left breast
N63.20 …… unspecified quadrant
N63.21 …… upper outer quadrant
N63.22 …… upper inner quadrant
N63.23 …… lower outer quadrant
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

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