The market for medical claim billers is growing exponentially. With legions of providers and an ever-expanding patient pool, health-care industry spending is expected to grow by 5.8 percent each year through 2024. By then, health-care spending will total $5.43 trillion and account for 19.6 percent of the gross domestic product. So let there be no doubt: Health care is big business and its growth shows no signs of slowing. This makes it the perfect time to start your own medical claims billing service.