your notes say that the Siewert classification is used for adenocarcinomas, therefore would the following mapping be correct?
Oesophageal upper third – C153 Oesophageal middle third – C154 Oesophageal lower third – C155 (Non-adenocarcinoma) Siewert 1- C155 (Adenocarcinoma only) Siewert 2 – C158 (Adenocarcinoma only) Siewert 3 – C160 (Adenocarcinoma only) Fundus – C161 Body – C162 Antrum – C163 Pylorus – C164 After further discussion, we have changed the Siewert 2 mapping. The final mapping should be as follows: Oesophageal upper third – C153 Oesophageal middle third – C154 Oesophageal lower third (Non-adenocarcinoma) – C155 Siewert 1- C155 (Adenocarcinoma only) Siewert 2 – C155 (Adenocarcinoma only) Siewert 3 – C160 (Adenocarcinoma only) Fundus – C161 Body – C162 Antrum – C163 Pylorus – C164 It is important to emphasise that the mapping is one-way only. In other words, the Audit codes can be mapped to ICD-10 codes in the manner above, but ICD-10 codes cannot be mapped to the Audit codes. This is because ICD-10 does not adequately code tumours of the gastro-oesophageal junction, whereas the Siewert classificat
