C50.422 (Malignant neoplasm of upper-outer quadrant of left male breast) compared with C50.429 (Malignant neoplasm of upper-outer quadrant of unspecified male breast), from the official CMS tabular data. C50.422 and C50.429 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. C50.422 and C50.429 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.
| C50.422Malignant neoplasm of upper-outer quadrant of left male breast | C50.429Malignant neoplasm of upper-outer quadrant of unspecified male breast | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of upper-outer quadrant of left male breast is a billable ICD-10-CM diagnosis code (C50.422). | Malignant neoplasm of upper-outer quadrant of unspecified male breast is a billable ICD-10-CM diagnosis code (C50.429). |
| Includes | connective tissue of breast Paget's disease of breast Paget's disease of nipple | connective tissue of breast Paget's disease of breast Paget's disease of nipple |
| Use additional code | code to identify estrogen, and other hormones and factors receptor status (Z17.-) | code to identify estrogen, and other hormones and factors receptor status (Z17.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources