Unspecified lump in breast (N63) ICD-10-CM
The N63 code range covers unspecified lump in breast with 22 ICD-10-CM diagnosis codes. 17 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
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
Codes in the N63 Range 22 codes · 17 billable
- N63 Unspecified lump in breastNon-billable
- N63.0 Unspecified lump in unspecified breast
- N63.1 Unspecified lump in the right breastNon-billable
- 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
- N63.15 Unspecified lump in the right breast, overlapping quadrants
- N63.2 Unspecified lump in the left breastNon-billable
- N63.20 Unspecified lump in the left breast, unspecified quadrant
- N63.21 Unspecified lump in the left breast, upper outer quadrant
- N63.22 Unspecified lump in the left breast, upper inner quadrant
- N63.23 Unspecified lump in the left breast, lower outer quadrant
- N63.24 Unspecified lump in the left breast, lower inner quadrant
- N63.25 Unspecified lump in the left breast, overlapping quadrants
- N63.3 Unspecified lump in axillary tailNon-billable
- N63.31 Unspecified lump in axillary tail of the right breast
- N63.32 Unspecified lump in axillary tail of the left breast
- N63.4 Unspecified lump in breast, subareolarNon-billable
- N63.41 Unspecified lump in right breast, subareolar
- N63.42 Unspecified lump in left breast, subareolar
About the N63 Code Range
A breast lump appears in N63 when the lump itself is unspecified. The subdivisions describe where it is.
N63.0 does not specify which breast. The right- and left-breast subdivisions identify an upper or lower, inner or outer quadrant, overlapping quadrants, or an unspecified quadrant. N63.3 identifies the axillary tail, the breast area toward the armpit. N63.4 identifies the subareolar area, beneath the nipple area. Both have right- and left-breast subdivisions.
Questions About This Page
How many billable codes are in the N63 range?
Of the 22 codes in this range, 17 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the N63 range classify?
The range classifies unspecified lump in breast. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
