Yes, that helps, thanks. The difference between insurance plans is interesting.

"Infusions are more expensive than injections and I understand that some insurance companies require the doctor to inform them if an injection is possible or not."
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The cost analysis is complicated and depends on many factors and how it is analyzed. The administration cost of doing an IV infusion is certainly an added cost to an insurance company. The out of pocket cost to the patient might be much less when out of pocket maximums and insurance coverage are considered.

Infusions may be covered under Medicare Part B, while injections fall under Part D.

The cost of only the medication is less when given by infusion. I'm sure hospitals buy medications in bulk supplies and get discounts direct from the company.

There are other costs to the injections like shipping and handling along with wastage caused by expiration dates, improper storage and other reasons.

I was aghast when a patient said she still had syringes left when Actemra was discontinued. The patient was told to throw the unused syringes away.