[header] How to fight common health insurance claim denials [title] Read your explanation of benefits (eob). [step] After you visit your doctor, your insurance company will send you an explanation of benefits. You will receive this form for all of your claims, regardless of whether they were approved or not. 
When the insurer rejects a claim, a code should appear on your eob. [substeps] The back of the form should have a key that will help you understand the code.