A couple medical coding issues around Covid I am chasing

They seem technical but are crucial to determine how well the vaccines are working and what their side effects are or aren’t:

The first has to do with how easy/hard it is to classify a Covid patient as Covid vaccinated in hospital EMR systems;

The second has to do with ICD U12.9/T50.Z95A (if you are a coder, you will know what these are) - whether systems are accepting them at all, whether anyone is using them, whether they impact reimbursement.

If you work at a hospital, physician group, or insurer and have knowledge of either issue, please email me at alexberensonauthor at protonmail.com (more secure than Google)…