CMS1500/UB04 Claims Forms

1500 is a medical claim (Professional) and UB04 is hospital claim (Institutional).

837P is a 1500 Medical Claims and 837I is a UB04 Hospital claims.

When paper is sent, a 1500 form is used for Medical claims and a UB04 form for Hospital. Optum does not have a master list of information. The information is common across the medical industry and there are many crosswalks or sites you can find, which map the paper claim locations to a 837.