I mail them in one large envelope per carrier per provider. I use the large claim form envelopes.
Since I've worked for insurance companies I sort of have a heads up on this one..and it does matter. I don't mix providers in one envelope..EVER. That's for privacy reasons as well as it's too easy for claims to be processed under the wrong provider tax ID. Each provider's claims go to different places. I don't use staples in the large claim form envelopes because they get removed anyway. If I have a claim that needs an attachment it goes into a separate envelope, no staples. When the carriers get claims, they are immediately gone through and staples, paper clips etc are removed because the claims go through a microfiche machine..each claim is given a number on each page.
We use small envelopes with windows. I took the time to weigh everything and know that I can get 6 claim forms in one envelope without extra postage. The specialty window envelpes are nice, but they are more expensive, so I just use regular window envelopes and fold the claim forms a little funky to make sure the address shows through the window.About staples. I know we're not supposed to staple and I have been told this from several people who have worked 'on the inside'. However, I still staple charts, EOBs, etc., to the claim form and write in bold letters CHARTS ATTACHED. There have been several times I have called on an unpaid claim, only to have them tell me "we still need chart notes". I ask them to pull up the scanned copy of the claim form and--lo and behold--there is the note on the top of the claim form and a nice big rip mark in the corner where they separated the stapled papers. Funny how they always manage to find the chart notes after they see this...~Kelli