2027 ICD-10-CM Diagnosis Code N63Unspecified lump in breast

ICD-10-CM Codes›N00–N99›N60-N65›N63

ICD-10-CM N63
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N63 is a non-billable ICD-10-CM category code for unspecified lump in breast, so it cannot be submitted on claims. Use a more specific code from this category instead, such as N63.0, N63.10, N63.11, and N63.12. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonmalignant breast conditions.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such lump in breast and other disorders of the breast.

Code Identity

ICD-10-CM Code
N63
Billable Status
No — Non-Billable Category
Code Describes
Unspecified lump in breast
Short Description
Unspecified lump in breast
Same as the full description in the CMS dataset.
Chapter
N60-N65
Disorders of breast

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN63Unspecified lump in breast
This CodeN63Unspecified lump in breast

Specific Coding for Unspecified lump in breastOverview

Non-specific codes like N63 require more characters. Use one of these billable codes instead:

  • Use N63.0 for Unspecified lump in unspecified breast

  • N63.1 for Unspecified lump in the right breast

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

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

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

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

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

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

  • N63.2 for Unspecified lump in the left breast

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

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

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

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

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

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

  • N63.3 for Unspecified lump in axillary tail

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

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

  • N63.4 for Unspecified lump in breast, subareolar

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

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N63: its own notes plus those printed at block N60-N65 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Nodule(s) NOS in breast

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block N60-N65 Disorders of breast applies to 60 codes
  • disorders of breast associated with childbirth (O91-O92)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N63, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming N63: its condition is not part of those codes, and both may be reported when the patient has both.

  • Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    signs and symptoms of breast (N63, N64.5)
  • R22.2 Localized swelling, mass and lump, trunk
    breast mass and lump (N63)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN017
Nonmalignant breast conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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.

The full article covers:

  • What are breast diseases?
  • What are the symptoms of breast disease?
  • How are breast diseases diagnosed?
  • What are the treatments for breast disease?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N63Overview

What is the ICD-10 code for unspecified lump in breast?

N63 is the ICD-10-CM category for unspecified lump in breast, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is N63 (Unspecified lump in breast) a billable code?

No. This is a category header that groups the codes for unspecified lump in breast, and headers cannot be submitted on claims. Claims for unspecified lump in breast need a more specific code from this category, such as N63.0, N63.10, and N63.11.