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  5. Category N63
Category N63

Unspecified lump in breast

Clinical Classification Guidelines

Inclusion Term

  • Nodule(s) NOS in breast

Specific Diagnosis Codes

Unspecified lump in unspecified breast
N63.0
Unspecified lump in the right breast
N63.1
Unspecified lump in the right breast, unspecified quadrant
N63.10
Unspecified lump in the right breast, upper outer quadrant
N63.11
Unspecified lump in the right breast, upper inner quadrant
N63.12
Unspecified lump in the right breast, lower outer quadrant
N63.13
Unspecified lump in the right breast, lower inner quadrant
N63.14
Unspecified lump in the right breast, overlapping quadrants
N63.15
Unspecified lump in the left breast
N63.2
Unspecified lump in the left breast, unspecified quadrant
N63.20
Unspecified lump in the left breast, upper outer quadrant
N63.21
Unspecified lump in the left breast, upper inner quadrant
N63.22
Unspecified lump in the left breast, lower outer quadrant
N63.23
Unspecified lump in the left breast, lower inner quadrant
N63.24
Unspecified lump in the left breast, overlapping quadrants
N63.25
Unspecified lump in axillary tail
N63.3
Unspecified lump in axillary tail of the right breast
N63.31
Unspecified lump in axillary tail of the left breast
N63.32
Unspecified lump in breast, subareolar
N63.4
Unspecified lump in right breast, subareolar
N63.41
Unspecified lump in left breast, subareolar
N63.42
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Data updated for October 2025 release.

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