Table 1 Diagnosis at hospital discharge according to ICD-9 CM code

174.9 – Breast (female) unspecified

2412

43.55

174.4 – Upper–outer quadrant

1087

19.63

174.8 – Other specified sites of the female breast

309

5.58

174.2 – Upper–inner quadrant

258

4.66

174.5 – Lower–outer quadrant

161

2.97

174.1 – Central portion

152

2.74

174.3 – Lower–inner quadrant

147

2.65

174.0 – Nipple and areola

112

2.28

174.6 –Axillary tail

24

0.43

V58.1 –Antineoplastic chemotherapy and immunotherapy

432

7.80

V58.0 – Radiotherapy encounter

26

0.47

Other diagnosis

418

4.55