N63.0 — Unspecified lump in unspecified breast

N63.0

ICD-10 Chapter 14: Genitourinary System — illustrative image — Chapter 14: Diseases of the genitourinary system (N00–N99) — illustrative image

What this code means

A lump in the breast whose side and position are not specified; most breast lumps are benign but need assessment.

Also called: breast lump.

When this code is used

Used for unspecified lump in unspecified breast.

Where it sits in ICD-10-CM

Code N63.0 belongs to Chapter 14: Diseases of the genitourinary system, which covers codes N00–N99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related anatomy

Breasts

Watch: related videos

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Frequently asked questions

What is ICD-10-CM code N63.0?

N63.0 is the ICD-10-CM diagnosis code for “Unspecified lump in unspecified breast”. A lump in the breast whose side and position are not specified; most breast lumps are benign but need assessment.

When is code N63.0 used?

Used for unspecified lump in unspecified breast. It belongs to Chapter 14 of ICD-10-CM (Diseases of the genitourinary system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.