C50.412

Billable

Malignant neoplasm of upper-outer quadrant of left female breast

HCC Category Mapping

V28HCC 23 — Melanoma and Other Skin Cancers

0.251

V24HCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.150

ESRDHCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.000

RxHCCHCC 22 — Cancer, Other Specified Sites

0.000

What This Code Means

Cancer that starts in the upper-outer area of the left breast in women. This is the most common location for breast cancer to develop.

Coding Tips

•Ensure laterality (left) is clearly documented in the medical record before assigning this code
•Verify the quadrant location and confirm it is upper-outer, not upper-inner or lower quadrants

Clinical Significance

Malignant neoplasm of the upper-outer quadrant of left female breast represents invasive breast cancer requiring staging, treatment planning, and ongoing surveillance. Breast cancer is risk-adjusted because it demands significant healthcare resources including surgery, radiation, chemotherapy, hormonal therapy, and long-term monitoring.

Documentation Requirements

✓Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)
✓Laterality: left breast
✓Gender documented as female to support gender-specific code selection
✓Quadrant or subsite location: upper-outer quadrant
✓Tumor size (T stage) and grade
✓Lymph node status (N stage) — axillary, sentinel node biopsy results
✓Estrogen receptor, progesterone receptor, and HER2 status
✓Stage grouping (I-IV)
✓Current treatment status (active treatment, hormonal therapy, surveillance)

Commonly Confused Codes

C50.411 — Upper-outer quadrant of right female breast; verify laterality C50.419 — Upper-outer quadrant unspecified female; use only when laterality unknown C50.422 — Same laterality but male breast; verify patient gender C50.211-C50.219 — Upper-inner quadrant; most common confusion — upper-outer is lateral (toward axilla), upper-inner is medial (toward sternum)C50.511-C50.519 — Lower-outer quadrant; same lateral orientation but lower position C50.811-C50.819 — Overlapping sites; use when tumor spans multiple quadrants

Code Hierarchy

└C50Malignant neoplasm of breast └C50.4Malignant neoplasm of upper-outer quadrant of breast └C50.41Malignant neoplasm of upper-outer quadrant of breast, female └C50.412Malignant neoplasm of upper-outer quadrant of left female breast

└C50.412Malignant neoplasm of upper-outer quadrant of left female breast