Here are a couple of references that might help if you haven't seen them.
-- Lowering the Expense of Psoriatic Disease Treatments:
https://www.webmd.com/skin-problems-and-treatments/psoriasis/features/psoriatic-lower-stress-costs
-- The Consumer’s Guide to Biologics for Psoriatic Arthritis:
https://www.everydayhealth.com/psoriatic-arthritis/consumers-guide-to-biologics/