I've just crossed Ban Laem (Cambodia) 21.03.20, 6PM. Before entering Thailand they check everything very carefully. First, if your country is on the list, second if you have a medical certificate. We also had a temperature measured.
TLDR : Answer Summary
The post discusses the entry process into Thailand from Cambodia during the COVID-19 pandemic, highlighting thorough checks including country eligibility, medical certificates, and temperature checks. Several commenters inquire about the specifics of the medical certificate and the entry conditions based on different nationalities.