N63 Unspecified lump in breast

Category / Non-billable header 21 subcodes

Block: Disorders of breast (N60-N65)

Includes

  • Nodule(s) NOS in breast

Subcodes

Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.

Code Description Billable
N63..0 Unspecified lump in unspecified breast Yes
N63..1 Unspecified lump in the right breast No
N63..10 Unspecified lump in the right breast, unspecified quadrant Yes
N63..11 Unspecified lump in the right breast, upper outer quadrant Yes
N63..12 Unspecified lump in the right breast, upper inner quadrant Yes
N63..13 Unspecified lump in the right breast, lower outer quadrant Yes
N63..14 Unspecified lump in the right breast, lower inner quadrant Yes
N63..15 Unspecified lump in the right breast, overlapping quadrants Yes
N63..2 Unspecified lump in the left breast No
N63..20 Unspecified lump in the left breast, unspecified quadrant Yes
N63..21 Unspecified lump in the left breast, upper outer quadrant Yes
N63..22 Unspecified lump in the left breast, upper inner quadrant Yes
N63..23 Unspecified lump in the left breast, lower outer quadrant Yes
N63..24 Unspecified lump in the left breast, lower inner quadrant Yes
N63..25 Unspecified lump in the left breast, overlapping quadrants Yes
N63..3 Unspecified lump in axillary tail No
N63..31 Unspecified lump in axillary tail of the right breast Yes
N63..32 Unspecified lump in axillary tail of the left breast Yes
N63..4 Unspecified lump in breast, subareolar No
N63..41 Unspecified lump in right breast, subareolar Yes
N63..42 Unspecified lump in left breast, subareolar Yes

Last reviewed: September 2026