I was curious who paid for the vaccination

[question everything]

Since I did not see any entry in my insurance account (nor in my spouse's)

Medicare, for us, seniors.

I got mine through a "lottery" offered by a clinic associated with a hospital and I got it at a large warehouse that was fitted for this purpose. I had an appointment which I selected online, did not have to wait or stand in line, drove only 15 miles.

This claim was describes as:

Immunization administration by intramuscular injection of severe acute respiratory syndrome coronavi (0001A). And then the same but ending (0002A).

This provider charged $35 and Medicare paid $17.01 for the first dose. The second was charged $82, and Medicare paid $40.01. I have no idea why such a difference.

Spouse got them in the hospital after a clinic visit. The hospital and the clinics are all connected, also to the insurance company. Spouse was already 75 so did not have to rely on a lottery or availability at a site 300 miles away.

That claim was described as:

ADM SARSCOV2 30 MCG/0.3 ML 1ST (0001A) and then the same but ending 2ND (0002A). Here the provider charged $31.00 and Medicare paid $16.34. The second dose the charge was the same: $31.00 and Medicare paid $26.88.

I wonder why the difference.