As of October 2015, ICD-9 codes are no longer used for medical coding. Instead, use this equivalent ICD-10-CM code, which is an approximate match to ICD-9 code 174.2:
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
174.2 is a legacy non-billable code used to specify a medical diagnosis of malignant neoplasm of upper-inner quadrant of female breast. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
First, let’s review Breast Cancer ICD 9 Diagnosis Codes. Breast Cancer is coded under “Neoplasms (ICD 9 Code 140 - 239)”. Then, as cancer is the malignant form of neoplasm, look under Malignant Neoplasm of Bone, Connective Tissue, Skin, and Breast (ICD 9 Code 170 - 176) to find Breast Cancer ICD 9 Diagnosis Codes.
Similar as in ICD 9 diagnosis codes, Breast Cancer is located under "Neoplasms" although the codes of Neoplasms in ICD 10 diagnosis codes are C00 - D49. Then, Breast Cancer can be found under "Malignant neoplasms" of breast (ICD 10 Code C50 - C50). ICD 10 C50 malignant neoplasm of breast has sub categories as listed below: