N63.23: Unspecified lump in the left breast, lower outer quadrant
N63.23 is the billable ICD-10-CM diagnosis code for Unspecified lump in the left breast, lower outer quadrant. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code N63.23?
N63.23 is the ICD-10-CM diagnosis code for Unspecified lump in the left breast, lower outer quadrant. It belongs to category N63 (Unspecified lump in breast).
Is N63.23 a billable code?
Yes. N63.23 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does N63.23 belong to?
N63.23 is part of ICD-10-CM category N63 — Unspecified lump in breast, which has 34 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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