Unspecified lump in breast
In Disorders of breast (N60-N65), chapter 14: Diseases of the Genitourinary System
17 billable codes under N63: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- Nodule(s) NOS in breast
Also applies, from Disorders of breast (N60-N65)
These notes sit on N60-N65 and apply to every code under it, including N63.
Excludes1: not coded here, use a different code
- disorders of breast associated with childbirth (O91-O92)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers chronic kidney disease staging, CKD in kidney transplant patients, and sequencing CKD with related conditions such as diabetes and hypertension.
- Chronic kidney disease (page 62)
All codes under N63
N63 can't be used on a claim. Pick a billable code below; grey headings group them.
- N63.0Unspecified lump in unspecified breast
- N63.1Unspecified lump in the right breast
- N63.10Unspecified lump in the right breast, unspecified quadrant
- N63.11Unspecified lump in the right breast, upper outer quadrant
- N63.12Unspecified lump in the right breast, upper inner quadrant
- N63.13Unspecified lump in the right breast, lower outer quadrant
- N63.14Unspecified lump in the right breast, lower inner quadrant
- N63.15Unspecified lump in the right breast, overlapping quadrants
- N63.2Unspecified lump in the left breast
- N63.20Unspecified lump in the left breast, unspecified quadrant
- N63.21Unspecified lump in the left breast, upper outer quadrant
- N63.22Unspecified lump in the left breast, upper inner quadrant
- N63.23Unspecified lump in the left breast, lower outer quadrant
- N63.24Unspecified lump in the left breast, lower inner quadrant
- N63.25Unspecified lump in the left breast, overlapping quadrants
- N63.3Unspecified lump in axillary tail
- N63.31Unspecified lump in axillary tail of the right breast
- N63.32Unspecified lump in axillary tail of the left breast
- N63.4Unspecified lump in breast, subareolar
- N63.41Unspecified lump in right breast, subareolar
- N63.42Unspecified lump in left breast, subareolar
N63 MS-DRGs
As the principal diagnosis, all 17 billable codes under N63 group to MS-DRG 600 or 601 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Other codes that refer to N63
Notes on these codes point to N63.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about breast diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015.
- FY2018: Subcodes were added, so N63 is no longer billable on its own. New codes for cases coded here before: N63.0 (Unspecified lump in unspecified breast), N63.10 (Unspecified lump in the right breast, unspecified quadrant), N63.11 (Unspecified lump in the right breast, upper outer quadrant), N63.12 (Unspecified lump in the right breast, upper inner quadrant), N63.13 (Unspecified lump in the right breast, lower outer quadrant), N63.14 (Unspecified lump in the right breast, lower inner quadrant), N63.20 (Unspecified lump in the left breast, unspecified quadrant), N63.21 (Unspecified lump in the left breast, upper outer quadrant), and 7 more.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 611.72 Lump or mass in breast