K22.1
Excludes1: Barrett's esophagus (K22.7-)
Code first poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)
Use additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
K22
Excludes2: esophageal varices (I85.-)