I'm looking to find out if there are already any standards out there for storing/transmitting healthcare claim data (HCFA/CMS 1500, UB92, UB02, etc) through an XML format. I know of the official standards for X12 and ANSI-837 4010 but I'm looking for something a little less complex and before rolling our own I'd like to see if there is something else out there already built.
Are you aware of HL7? It's not XML but it's another healthcare standard.
Instead of worrying about complexity, invest in smart tools.
http://docs.sun.com/app/docs/doc/820-1279?l=en
The Oracle/Sun product is quite nice for translating between the X12 format and XML. Yes, it's commercial.
http://www.ibm.com/developerworks/data/library/dmmag/DMMag_2009_Issue2/Industry/index.html
The easy answer is that what standard you use depends on how you and the entity that you are sending data to, or receiving data from, are covered by HIPPA.
http://aspe.hhs.gov/admnsimp/pl104191.htm#1176
This is probably far from the answer you want, but X12 is THE required standard for transmission of healthcare claim data, at least as far as HIPPA is concerned. Also, requirements of specific transaction data labeling differ from state to state and agency to agency, though this is being consolidated. Check with the receiving entity on their specific requirements.
As for XML, you can embed HL7 XML data in the X12N data, if that's what you are looking for.
This is state specific but you might want to look at this
http://www.acbhcs.org/HIPAA/Resources/CMS%20Data%20Content%20and%20Code%20Sets.pdf