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C50Non-billableSave

C50 - Malignant neoplasm of breast

ICD-10-CM Chapter 2: Neoplasms · C50 Malignant neoplasms of breast (C50) · Top-level category · FY2027

Coding Guidance

C50 is a non-billable heading. Report one of the 10 more specific codes below.

Includes, Excludes and Coding Notes

IncludesFrom C50

Conditions this code covers.

  • connective tissue of breast
  • Paget's disease of breast
  • Paget's disease of nipple
Excludes 1 — Not Coded HereFrom C50

Mutually exclusive: these conditions are never reported together with this code.

  • skin of breast (C44.501, C44.511, C44.521, C44.591)
Use Additional CodeFrom C50

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify estrogen, and other hormones and factors receptor status (Z17.-)
NotesFrom Chapter C00-D49

Instructional notes from the ICD-10-CM tabular list.

  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

More Specific Codes (10)

C50.0Malignant neoplasm of nipple and areola→C50.1Malignant neoplasm of central portion of breast→C50.2Malignant neoplasm of upper-inner quadrant of breast→C50.3Malignant neoplasm of lower-inner quadrant of breast→C50.4Malignant neoplasm of upper-outer quadrant of breast→C50.5Malignant neoplasm of lower-outer quadrant of breast→C50.6Malignant neoplasm of axillary tail of breast→C50.8Malignant neoplasm of overlapping sites of breast→C50.9Malignant neoplasm of breast of unspecified site→C50.AMalignant inflammatory neoplasm of breast→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with C50.