Left Breast Mass ICD-10-CM Codes

Left Breast Mass ICD-10-CM Codes

Explore ICD-10-CM codes for left breast mass, their billability and other related information.

By Wynona Jugueta on Jul 16, 2025.

Fact Checked by Karina Jimenea.

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What are Left Breast Mass ICD-10-CM Codes?

A left breast mass refers to an abnormal lump, swelling, or growth detected in the left breast tissue. This finding can indicate a variety of conditions, ranging from non-malignant breast disorders like cysts or fibroadenomas to malignant neoplasms requiring urgent attention.

Codes for left breast mass or lumps typically fall under N63.2, the category for unspecified lump in left breast. Here are said codes:

  • N63.20 Unspecified lump in the left breast, unspecified quadrant
  • N63.21 Unspecified lump in the left breast, upper outer quadrant
  • N63.22 Unspecified lump in the left breast, upper inner quadrant
  • N63.23 Unspecified lump in the left breast, lower outer quadrant
  • N63.24 Unspecified lump in the left breast, lower inner quadrant
  • N63.25 Unspecified lump in the left breast, overlapping quadrants

For lump in right breast, refer to codes under N63.1.

Which Left Breast Mass ICD-10-CM Codes are billable?

All listed specific codes are valid and billable and can be used for billing and reimbursement purposes.  

Clinical information

  • A left breast mass is an abnormal lump or swelling detected in the left breast tissue.
  • It can be benign (non-cancerous) or malignant (cancerous) growth.
  • Common benign causes include fibroadenomas, cysts, and lipomas.
  • Malignant causes may include breast cancer, which requires prompt evaluation and diagnosis.
  • Other symptoms may accompany a breast mass, such as changes in skin texture, nipple discharge, or pain.
  • Clinical assessment involves a physical examination, imaging tests (mammogram, ultrasound), and possibly a biopsy.
  • Early detection and diagnosis are critical for appropriate treatment and management.
  • Treatment varies depending on the underlying cause and may include surgery, chemotherapy, radiation, or hormone therapy.
  • Regular breast self-exams and mammograms are recommended to detect breast masses and breast cancer early.
  • Women should seek medical attention if they notice any changes in their breast tissue or experience concerning symptoms.

Synonyms include

  • Lump in the left breast
  • Left breast lump
  • Left breast tumor
  • Left breast nodule
  • Mass in the left breast
  • Unspecified breast lump in the left
  • Unspecified lump in breast, left

Related ICDs

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