ICD-10-CM › C00-D49 › C50 › C50.9 Malignant neoplasm of breast of... › C50.91

C50.91

Malignant neoplasm of breast of unspecified site, female

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 3 more specific codes instead:

  • 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

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Malignant neoplasm of breast of unspecified site, female

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from C50 Malignant neoplasm of breast

Excludes1 - never coded here

  • skin of breast (C44.501, C44.511, C44.521, C44.591)

Use additional code

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

Includes

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

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Codes in the same group

CodeDescriptionStatus
C50.92 Malignant neoplasm of breast of unspecified site, male Not billable