This value set includes codes based on the following rules:

• Include these codes as defined in http://snomed.info/sct

  Code	Display
  33496007	Reconstruction of breast
  69031006	Excision of breast tissue
  234254000	Excision of axillary lymph nodes group

• Include these codes as defined in http://hl7.org/fhir/uv/ichom-breast-cancer/CodeSystem/BreastSurgeryTypesCodeSystem

  Code	Display
  bcs	Breast conserving surgery (BCS)
  bcs-with-mammoplasty	Breast conserving surgery with mammoplasty
  mastectomy-without-immediate-reconstruction	Mastectomy without immediate reconstruction
  mastectomy-with-immediate-reconstruction	Mastectomy with immediate reconstruction

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-NullFlavor

  Code	Display	Definition
  UNK	unknown	**Description:**A proper value is applicable, but not known. **Usage Notes**: This means the actual value is not known. If the only thing that is unknown is how to properly express the value in the necessary constraints (value set, datatype, etc.), then the OTH or UNC flavor should be used. No properties should be included for a datatype with this property unless: 1. Those properties themselves directly translate to a semantic of "unknown". (E.g. a local code sent as a translation that conveys 'unknown') 2. Those properties further qualify the nature of what is unknown. (E.g. specifying a use code of "H" and a URL prefix of "tel:" to convey that it is the home phone number that is unknown.)

This value set contains 8 concepts