2021 ICD-10-CM Diagnosis Code N63

Unspecified lump in breast

    2016 2017 2018 - Converted to Parent Code 2019 2020 2021 Non-Billable/Non-Specific Code
  • N63 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 N63 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of N63 - other international versions of ICD-10 N63 may differ.
Applicable To
  • Nodule(s) NOS in breast
The following code(s) above N63 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:
  • N00-N99
    2021 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
    2021 ICD-10-CM Range N60-N65

    Disorders of breast

    Type 1 Excludes
    • disorders of breast associated with childbirth (O91-O92)
    Disorders of breast
Approximate Synonyms
  • Bilateral breast lump
  • Bilateral breast lumps
  • Breast lump
  • Breast lump in pregnancy
  • Left breast lump
  • Lump breast
  • Lump in left breast
  • Lump in right breast
  • Mammographic breast mass
  • Right breast lump
Clinical Information
  • A mass in the mammary gland, either mobile or immobile. Once the mass has reached the size of a small garden pea, it can be detected by palpation. With mammography a larger number of early breast cancers are being detected since this techniques allows detection prior to the point at which the mass can be felt. Breast masses are not always malignant. Benign fibrocystic breast disease is not uncommon. A fine needle biopsy aspiration can distinguish a cystic mass from a solid one.
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): Deleted code
  • 2018 (effective 10/1/2017): New code
  • 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 N63:
  • Type 2 Excludes: R22.2
    ICD-10-CM Diagnosis Code R22.2

    Localized swelling, mass and lump, trunk

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Type 1 Excludes
    • intra-abdominal or pelvic mass and lump (R19.0-)
    • intra-abdominal or pelvic swelling (R19.0-)
    Type 2 Excludes
    • breast mass and lump (N63)
ICD-10-CM Codes Adjacent To N63
N60.99 …… of unspecified breast
N61 Inflammatory disorders of breast
N61.0 Mastitis without abscess
N61.1 Abscess of the breast and nipple
N61.2 Granulomatous mastitis
N61.20 …… unspecified breast
N61.21 …… right breast
N61.22 …… left breast
N61.23 …… bilateral breast
N62 Hypertrophy of breast
N63 Unspecified lump in breast
N63.0 Unspecified lump in unspecified breast
N63.1 Unspecified lump in the right breast
N63.10 …… unspecified quadrant
N63.11 …… upper outer quadrant
N63.12 …… upper inner quadrant
N63.13 …… lower outer quadrant
N63.14 …… lower inner quadrant
N63.15 …… overlapping quadrants
N63.2 Unspecified lump in the left breast
N63.20 …… unspecified quadrant

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