http://cpc-exam.plus101.com/ ---Medical Coding Books. Passing the CPC exam is your first step in entering or moving up in working as a medical coder. Being certified gives you certain advantages, including: Having a recognized qualification. Important if you're an entry-level coder. Even if you're experienced, being certified makes it easier to seek out new opportunities. Certified coders earn on average $7000 more annually than uncertified personnel.