C50.911 ICD-10-CM Code: Malignant neoplasm of unspecified site of right female breast
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 582 — MASTECTOMY FOR MALIGNANCY WITH CC/MCC (MDC 09)
- MS-DRG 583 — MASTECTOMY FOR MALIGNANCY WITHOUT CC/MCC (MDC 09)
- MS-DRG 597 — MALIGNANT BREAST DISORDERS WITH MCC (MDC 09)
- MS-DRG 598 — MALIGNANT BREAST DISORDERS WITH CC (MDC 09)
- MS-DRG 599 — MALIGNANT BREAST DISORDERS WITHOUT CC/MCC (MDC 09)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Risk Adjustment (CMS-HCC)
Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.
- HCC 23 — Prostate, Breast, and Other Cancers and Tumors
Other models: CMS-HCC V22 HCC 12 · RxHCC V08 HCC 22
Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C50.911 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- connective tissue of breast
- Paget's disease of breast
- Paget's disease of nipple
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- skin of breast (C44.501, C44.511, C44.521, C44.591)
Use Additional Code
Supplementary codes the tabular list directs you to add.
- Use additional code to identify estrogen, and other hormones and factors receptor status (Z17.-)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to C50.911 in its code family, with their registry titles.
- C50.821 — Malignant neoplasm of overlapping sites of right male breast
- C50.822 — Malignant neoplasm of overlapping sites of left male breast
- C50.829 — Malignant neoplasm of overlapping sites of unspecified male breast
- C50.9 — Malignant neoplasm of breast of unspecified site
- C50.91 — Malignant neoplasm of breast of unspecified site, female
- C50.912 — Malignant neoplasm of unspecified site of left female breast
- C50.919 — Malignant neoplasm of unspecified site of unspecified female breast
- C50.92 — Malignant neoplasm of breast of unspecified site, male
- C50.921 — Malignant neoplasm of unspecified site of right male breast
- C50.922 — Malignant neoplasm of unspecified site of left male breast
Neoplasm Table Sites (1)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Malignant, Primary