C50.019 Malignant neoplasm of nipple and areola, unspecified female breast

ICD-10-CM Code C50.019: Malignant neoplasm of nipple and areola, unspecified female breast

ICD-10-CM code C50.019 identifies a malignant neoplasm of the nipple and areola of an unspecified female breast. The terminology is active for the 2026 version and falls under the parent category for female nipple and areola malignancies. The code appears in Medicare articles concerning a specific laboratory assay. 1 4 5

Plain-language overview

Code C50.019 designates a malignant neoplastic process located in the nipple and areola of a female breast when the specific left or right side is not specified. 1

What this code represents

The official preferred name for C50.019 is malignant neoplasm of nipple and areola, unspecified female breast, and the concept's semantic type is a neoplastic process. 1

Within the terminology hierarchy, C50.019 is a narrower concept under the parent code C50.01 for malignant neoplasm of nipple and areola, female breast. 1

Coding details

The terminology record for C50.019 is active for the 2026 ICD-10-CM version and includes an abbreviation for malignant neoplasm of nipple and areola, unsp female breast. 1

The C50.019 code is listed alongside C50.012 for the left female breast, distinguishing the unspecified female breast laterality from the explicitly left-sided diagnosis. 4 5

Documentation considerations

The official terminology record for C50.019 includes an abbreviation specifying the unsp female breast, and the record status is active for the 2026 ICD-10-CM version. 1

Coverage and utilization context

Code C50.019 appears in Group 1 of Medicare billing articles for the Oncotype DX Breast Cancer Assay, listed alongside C50.012 for the left female breast. 4 5

What the sources add

While terminology records define the code's hierarchical structure, Medicare articles add operational context by listing C50.019 within billing groups for specific laboratory assays. 1 4 5

A phecode mapping resource lists the phrase malignant neoplasm of nipple and areola, unspecified female breast, corresponding to the exact terminology used for the C50.019 diagnosis code. 1 3

Sources

1. ICD-10-CM C50.019 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Benign and malignant breast lesions in children and adolescents - diagnostic and therapeutic approach — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 174.11 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. Article - Billing and Coding: MolDX: Oncotype DX® Breast Cancer Assay (A53105) — cms.gov; accessed 2026-07-27.
5. Article - Billing and Coding: MolDX: Oncotype DX® Breast Cancer Assay (A54480) — cms.gov; accessed 2026-07-27.