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  6. 2026 ICD-10-CM Code N63

2026 ICD-10-CM Diagnosis Code N63

Unspecified lump in breast

ICD-10-CM Code:
N63
ICD-10 Code for:
Unspecified lump in breast
Is Billable?
Not Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

N63 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of unspecified lump in breast. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

The code is commonly used in ob/gyn medical specialties to specify clinical concepts such as lump in breast and other disorders of the breast.

Unspecified diagnosis codes like N63 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Unspecified lump in breast

Non-specific codes like N63 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for unspecified lump in breast:

  • Use N63.0 for Unspecified lump in unspecified breast - BILLABLE CODE

  • N63.1 for Unspecified lump in the right breast - NON-BILLABLE CODE

  • Use N63.10 for Unspecified lump in the right breast, unspecified quadrant - BILLABLE CODE

  • Use N63.11 for Unspecified lump in the right breast, upper outer quadrant - BILLABLE CODE

  • Use N63.12 for Unspecified lump in the right breast, upper inner quadrant - BILLABLE CODE

  • Use N63.13 for Unspecified lump in the right breast, lower outer quadrant - BILLABLE CODE

  • Use N63.14 for Unspecified lump in the right breast, lower inner quadrant - BILLABLE CODE

  • Use N63.15 for Unspecified lump in the right breast, overlapping quadrants - BILLABLE CODE

  • N63.2 for Unspecified lump in the left breast - NON-BILLABLE CODE

  • Use N63.20 for Unspecified lump in the left breast, unspecified quadrant - BILLABLE CODE

  • Use N63.21 for Unspecified lump in the left breast, upper outer quadrant - BILLABLE CODE

  • Use N63.22 for Unspecified lump in the left breast, upper inner quadrant - BILLABLE CODE

  • Use N63.23 for Unspecified lump in the left breast, lower outer quadrant - BILLABLE CODE

  • Use N63.24 for Unspecified lump in the left breast, lower inner quadrant - BILLABLE CODE

  • Use N63.25 for Unspecified lump in the left breast, overlapping quadrants - BILLABLE CODE

  • N63.3 for Unspecified lump in axillary tail - NON-BILLABLE CODE

  • Use N63.31 for Unspecified lump in axillary tail of the right breast - BILLABLE CODE

  • Use N63.32 for Unspecified lump in axillary tail of the left breast - BILLABLE CODE

  • N63.4 for Unspecified lump in breast, subareolar - NON-BILLABLE CODE

  • Use N63.41 for Unspecified lump in right breast, subareolar - BILLABLE CODE

  • Use N63.42 for Unspecified lump in left breast, subareolar - BILLABLE CODE

Code Classification

  • Diseases of the genitourinary system
    N00–N99
    • Disorders of breast
      N60-N65
      • Unspecified lump in breast
        N63

Clinical Classification

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Nonmalignant breast conditions

CCSR Code: GEN017

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Nodule(s) NOS in breast

Patient Education


Breast Diseases

What are breast diseases?

Breast diseases include various conditions and changes in your breast. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges of fluids that are not breast milk.

Although many women fear cancer, most breast changes are benign, meaning they are not cancer. These breast changes are known as benign breast disease. See your health care provider if you have a breast lump, pain, discharge, or skin irritation. Minor and serious breast problems often have similar symptoms and may need treatment.

Common breast changes and conditions can include:

  • Fibrocystic breast changes can include lumpiness, thickening, and swelling, often just before your period. Your breasts may feel painful, swollen, or tender.
  • Cysts are fluid-filled lumps that may be tender.
  • Fibroadenomas are solid, round, rubbery lumps that easily move when pushed, occurring most in younger women.
  • Intraductal papillomas are wart-like benign tumors that grow in the milk duct of the breast.
  • Blocked milk ducts.
  • Milk production when you're not breastfeeding.

What are the symptoms of breast disease?

Symptoms depend on the type of breast disease. Benign breast diseases may not have any symptoms, or they could include:

  • A lump or firm feeling in your breast or under your arm
  • A change in the size or shape of your breast
  • Nipple discharge
  • Skin changes such as itching, redness or darkening, dimples, scaling, or puckering on your breast or nipple
  • Painful, swollen, or tender breasts

See your provider if you're noticing any of these symptoms or other unusual changes. Some symptoms may be warning signs or symptoms of breast cancer.

How are breast diseases diagnosed?

Some breast changes may be felt or seen. You may notice a change in your breast, or your provider may notice it during a clinical breast exam. Other breast changes may only be found during a screening mammogram or other imaging tests such as an MRI or ultrasound. Your provider may also recommend a breast biopsy to check a suspicious change in your breast.

What are the treatments for breast disease?

Some benign breast changes may increase your risk of breast cancer in the future and may need treatment now. Treatment depends on the type of breast disease that you have. Some breast changes may go away without treatment, while others may require monitoring, biopsy, or surgery.

NIH: National Cancer Institute


[Learn More in MedlinePlus]

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.