| N63 | Unspecified lump in breast | NON-BILLABLE CODE |
| N63.0 | Unspecified lump in unspecified breast | BILLABLE CODE |
| N63.1 | Unspecified lump in the right breast | NON-BILLABLE CODE |
| N63.10 | Unspecified lump in the right breast, unspecified quadrant | BILLABLE CODE |
| N63.11 | Unspecified lump in the right breast, upper outer quadrant | BILLABLE CODE |
| N63.13 | Unspecified lump in the right breast, lower outer quadrant | BILLABLE CODE |
| N63.14 | Unspecified lump in the right breast, lower inner quadrant | BILLABLE CODE |
| N63.15 | Unspecified lump in the right breast, overlapping quadrants | BILLABLE CODE |
| N63.2 | Unspecified lump in the left breast | NON-BILLABLE CODE |
| N63.20 | Unspecified lump in the left breast, unspecified quadrant | BILLABLE CODE |
| N63.21 | Unspecified lump in the left breast, upper outer quadrant | BILLABLE CODE |
| N63.22 | Unspecified lump in the left breast, upper inner quadrant | BILLABLE CODE |
| N63.23 | Unspecified lump in the left breast, lower outer quadrant | BILLABLE CODE |
| N63.24 | Unspecified lump in the left breast, lower inner quadrant | BILLABLE CODE |
| N63.25 | Unspecified lump in the left breast, overlapping quadrants | BILLABLE CODE |
| N63.3 | Unspecified lump in axillary tail | NON-BILLABLE CODE |
| N63.31 | Unspecified lump in axillary tail of the right breast | BILLABLE CODE |
| N63.32 | Unspecified lump in axillary tail of the left breast | BILLABLE CODE |
| N63.4 | Unspecified lump in breast, subareolar | NON-BILLABLE CODE |
| N63.41 | Unspecified lump in right breast, subareolar | BILLABLE CODE |
| N63.42 | Unspecified lump in left breast, subareolar | BILLABLE CODE |
