1. C50 Malignant neoplasm of breast

    Use Additional code to identify estrogen receptor status (Z17.0, Z17.1)

    Includes:

    • connective tissue of breast
    • Paget's disease of breast
    • Paget's disease of nipple

    Excludes1

    1. C50.0 Malignant neoplasm of nipple and areola

      1. C50.01 Malignant neoplasm of nipple and areola, female

        • C50.011 Malignant neoplasm of nipple and areola, right female breast
        • C50.012 Malignant neoplasm of nipple and areola, left female breast
        • C50.019 Malignant neoplasm of nipple and areola, unspecified female breast
      2. C50.02 Malignant neoplasm of nipple and areola, male

        • C50.021 Malignant neoplasm of nipple and areola, right male breast
        • C50.022 Malignant neoplasm of nipple and areola, left male breast
        • C50.029 Malignant neoplasm of nipple and areola, unspecified male breast
    2. C50.1 Malignant neoplasm of central portion of breast

      1. C50.11 Malignant neoplasm of central portion of breast, female

        • C50.111 Malignant neoplasm of central portion of right female breast
        • C50.112 Malignant neoplasm of central portion of left female breast
        • C50.119 Malignant neoplasm of central portion of unspecified female breast
      2. C50.12 Malignant neoplasm of central portion of breast, male

        • C50.121 Malignant neoplasm of central portion of right male breast
        • C50.122 Malignant neoplasm of central portion of left male breast
        • C50.129 Malignant neoplasm of central portion of unspecified male breast
    3. C50.2 Malignant neoplasm of upper-inner quadrant of breast

      1. C50.21 Malignant neoplasm of upper-inner quadrant of breast, female

        • C50.211 Malignant neoplasm of upper-inner quadrant of right female breast
        • C50.212 Malignant neoplasm of upper-inner quadrant of left female breast
        • C50.219 Malignant neoplasm of upper-inner quadrant of unspecified female breast
      2. C50.22 Malignant neoplasm of upper-inner quadrant of breast, male

        • C50.221 Malignant neoplasm of upper-inner quadrant of right male breast
        • C50.222 Malignant neoplasm of upper-inner quadrant of left male breast
        • C50.229 Malignant neoplasm of upper-inner quadrant of unspecified male breast
    4. C50.3 Malignant neoplasm of lower-inner quadrant of breast

      1. C50.31 Malignant neoplasm of lower-inner quadrant of breast, female

        • C50.311 Malignant neoplasm of lower-inner quadrant of right female breast
        • C50.312 Malignant neoplasm of lower-inner quadrant of left female breast
        • C50.319 Malignant neoplasm of lower-inner quadrant of unspecified female breast
      2. C50.32 Malignant neoplasm of lower-inner quadrant of breast, male

        • C50.321 Malignant neoplasm of lower-inner quadrant of right male breast
        • C50.322 Malignant neoplasm of lower-inner quadrant of left male breast
        • C50.329 Malignant neoplasm of lower-inner quadrant of unspecified male breast
    5. C50.4 Malignant neoplasm of upper-outer quadrant of breast

      1. C50.41 Malignant neoplasm of upper-outer quadrant of breast, female

        • C50.411 Malignant neoplasm of upper-outer quadrant of right female breast
        • C50.412 Malignant neoplasm of upper-outer quadrant of left female breast
        • C50.419 Malignant neoplasm of upper-outer quadrant of unspecified female breast
      2. C50.42 Malignant neoplasm of upper-outer quadrant of breast, male

        • C50.421 Malignant neoplasm of upper-outer quadrant of right male breast
        • C50.422 Malignant neoplasm of upper-outer quadrant of left male breast
        • C50.429 Malignant neoplasm of upper-outer quadrant of unspecified male breast
    6. C50.5 Malignant neoplasm of lower-outer quadrant of breast

      1. C50.51 Malignant neoplasm of lower-outer quadrant of breast, female

        • C50.511 Malignant neoplasm of lower-outer quadrant of right female breast
        • C50.512 Malignant neoplasm of lower-outer quadrant of left female breast
        • C50.519 Malignant neoplasm of lower-outer quadrant of unspecified female breast
      2. C50.52 Malignant neoplasm of lower-outer quadrant of breast, male

        • C50.521 Malignant neoplasm of lower-outer quadrant of right male breast
        • C50.522 Malignant neoplasm of lower-outer quadrant of left male breast
        • C50.529 Malignant neoplasm of lower-outer quadrant of unspecified male breast
    7. C50.6 Malignant neoplasm of axillary tail of breast

      1. C50.61 Malignant neoplasm of axillary tail of breast, female

        • C50.611 Malignant neoplasm of axillary tail of right female breast
        • C50.612 Malignant neoplasm of axillary tail of left female breast
        • C50.619 Malignant neoplasm of axillary tail of unspecified female breast
      2. C50.62 Malignant neoplasm of axillary tail of breast, male

        • C50.621 Malignant neoplasm of axillary tail of right male breast
        • C50.622 Malignant neoplasm of axillary tail of left male breast
        • C50.629 Malignant neoplasm of axillary tail of unspecified male breast
    8. C50.8 Malignant neoplasm of overlapping sites of breast

      1. C50.81 Malignant neoplasm of overlapping sites of breast, female

        • C50.811 Malignant neoplasm of overlapping sites of right female breast
        • C50.812 Malignant neoplasm of overlapping sites of left female breast
        • C50.819 Malignant neoplasm of overlapping sites of unspecified female breast
      2. C50.82 Malignant neoplasm of overlapping sites of breast, male

        • C50.821 Malignant neoplasm of overlapping sites of right male breast
        • C50.822 Malignant neoplasm of overlapping sites of left male breast
        • C50.829 Malignant neoplasm of overlapping sites of unspecified male breast
    9. C50.9 Malignant neoplasm of breast of unspecified site

      1. C50.91 Malignant neoplasm of breast of unspecified site, female

        • C50.911 Malignant neoplasm of unspecified site of right female breast
        • C50.912 Malignant neoplasm of unspecified site of left female breast
        • C50.919 Malignant neoplasm of unspecified site of unspecified female breast
      2. C50.92 Malignant neoplasm of breast of unspecified site, male

        • C50.921 Malignant neoplasm of unspecified site of right male breast
        • C50.922 Malignant neoplasm of unspecified site of left male breast
        • C50.929 Malignant neoplasm of unspecified site of unspecified male breast
Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.