C50.A vs N61.21
C50.A (Malignant inflammatory neoplasm of breast) compared with N61.21 (Granulomatous mastitis, right breast), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. N61.21 carries an Excludes1 note covering C50.A: “inflammatory carcinoma of breast (C50.A-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| C50.AMalignant inflammatory neoplasm of breast | N61.21Granulomatous mastitis, right breast | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Malignant inflammatory neoplasm of breast is a non-billable ICD-10-CM category code (C50.A). | Granulomatous mastitis, right breast is a billable ICD-10-CM diagnosis code (N61.21). |
| Includes | connective tissue of breast Paget's disease of breast Paget's disease of nipple Inflammatory breast cancer (IBC) | — |
| Use additional code | 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