N63.12 (Unspecified lump in the right breast, upper inner quadrant) compared with N63.22 (Unspecified lump in the left breast, upper inner quadrant), from the official CMS tabular data. N63.12 and N63.22 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. N63.12 and N63.22 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| N63.12Unspecified lump in the right breast, upper inner quadrant | N63.22Unspecified lump in the left breast, upper inner quadrant | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | N00-N99 — Diseases of the genitourinary system | N00-N99 — Diseases of the genitourinary system |
| Definition | Unspecified lump in the right breast, upper inner quadrant is a billable ICD-10-CM diagnosis code (N63.12). | Unspecified lump in the left breast, upper inner quadrant is a billable ICD-10-CM diagnosis code (N63.22). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources