ICD-10-CM category
N63 Unspecified lump in breast
N63 is a category, not a billable code. Report one of the 17 complete codes below.
Codes in N63
- N63.0Unspecified lump in unspecified 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
- N63.20Unspecified 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
- N63.31Unspecified lump in axillary tail of the right breast
- N63.32Unspecified lump in axillary tail of the left breast
- N63.41Unspecified lump in right breast, subareolar
- N63.42Unspecified lump in left breast, subareolar
Outside the US? N63 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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