ICD-10-CM Code for Right-Sided Hormone Receptor-Positive Breast Cancer
The appropriate ICD-10-CM code for right-sided hormone receptor-positive breast cancer is C50.911 (malignant neoplasm of unspecified site of right female breast) or a more specific code from the C50.x11 series if the exact quadrant or location within the right breast is known.
Understanding the Coding Structure
The ICD-10-CM coding system for breast cancer follows this pattern:
- C50.x = Malignant neoplasm of breast
- The fourth character specifies the anatomical location within the breast
- The fifth character indicates laterality: 1 = right breast, 2 = left breast
Specific Location Codes for Right Breast
If the tumor location is documented, use these more specific codes:
- C50.011 - Malignant neoplasm of nipple and areola, right female breast
- C50.111 - Malignant neoplasm of central portion of right female breast
- C50.211 - Malignant neoplasm of upper-inner quadrant of right female breast
- C50.311 - Malignant neoplasm of lower-inner quadrant of right female breast
- C50.411 - Malignant neoplasm of upper-outer quadrant of right female breast
- C50.511 - Malignant neoplasm of lower-outer quadrant of right female breast
- C50.611 - Malignant neoplasm of axillary tail of right female breast
- C50.811 - Malignant neoplasm of overlapping sites of right female breast
- C50.911 - Malignant neoplasm of unspecified site of right female breast
Important Coding Considerations
The hormone receptor-positive status is NOT coded within the primary ICD-10-CM diagnosis code itself. The C50.x11 codes identify the anatomical location and laterality only. Hormone receptor status, while clinically critical for treatment decisions 1, requires separate documentation in the medical record and may be captured through additional coding systems or clinical documentation.
Clinical Context
Hormone receptor-positive breast cancer represents the majority of breast cancers, with tumors expressing estrogen receptors (ER+) and/or progesterone receptors (PR+) 1. This biological characteristic fundamentally determines treatment strategy, as these patients are candidates for adjuvant endocrine therapy regardless of age, lymph node status, or whether chemotherapy is administered 1.
Common Pitfalls to Avoid
- Do not use unspecified codes (C50.911) when specific quadrant information is available in the pathology or imaging reports
- Always verify laterality - the fifth digit "1" specifically denotes right breast; omitting or incorrectly coding this leads to documentation errors
- Document hormone receptor status separately in clinical notes, as this information guides treatment but is not part of the ICD-10-CM anatomical diagnosis code