2023

  1. ICD-10-CM Codes
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  2. C00-D49
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  3. C50-C50
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  4. C50-
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  5. 2023 ICD-10-CM Diagnosis Code C50.312

2023 ICD-10-CM Diagnosis Code C50.312

Malignant neoplasm of lower-inner quadrant of left female breast

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Female Dx
  • C50.312 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Malig neoplasm of lower-inner quadrant of left female breast
  • The 2023 edition of ICD-10-CM C50.312 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of C50.312 - other international versions of ICD-10 C50.312 may differ.
ICD-10-CM Coding Rules
  • C50.312 is applicable to female patients.
The following code(s) above C50.312 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C50.312:
  • C00-D49
    2023 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • 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).
    Neoplasms
  • C50
    ICD-10-CM Diagnosis Code C50

    Malignant neoplasm of breast

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Includes
    • connective tissue of breast
    • Paget's disease of breast
    • Paget's disease of nipple
    Type 1 Excludes
    Use Additional
    • code to identify estrogen receptor status (Z17.0, Z17.1)
    Malignant neoplasm of breast
Approximate Synonyms
  • Cancer female breast, left lower-inner quadrant
  • Female breast infiltrating ductal carcinoma, l lower-i
  • Female breast infiltrating lobular carcinoma, l lower-
  • Infiltrating ductal carcinoma of lower-inner quadrant of left female breast
  • Infiltrating lobular carcinoma of lower-inner quadrant of left female breast
  • Primary malignant neoplasm of left lower inner quadrant of female breast
ICD-10-CM C50.312 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 582 Mastectomy for malignancy with cc/mcc
  • 583 Mastectomy for malignancy without cc/mcc
  • 597 Malignant breast disorders with mcc
  • 598 Malignant breast disorders with cc
  • 599 Malignant breast disorders without cc/mcc

Convert C50.312 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
ICD-10-CM Codes Adjacent To C50.312
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
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
C50.3 Malignant neoplasm of lower-inner quadrant of breast
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
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
C50.4 Malignant neoplasm of upper-outer quadrant of breast
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

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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