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I haven't had success with PFD on medical collections. But I have had success with Whychat's Hipaa letter process. You would need to google it as it isn't allowed for discussion on these boards. I'm sure if you want to do PFD, a search for PFD letters in the search bar on here would be a great resource too! I have seen many on these forums before.
Congrats on the new home loan, btw!