Doctors in Colorado and across the country are facing a facing a major shift in how they bill for treatments - a shift that threatens to slow their ability to get reimbursements if they do not make it correctly.

By Oct. 1, physicians and insurers must make the transition to what's called ICD-10, a new iteration of the International Classification of Diseases system of coding injuries and illnesses. Most of the developed world has been using ICD-10 coding for years, but it wasn't until 2008 that the Centers for Medicare and Medicaid Services decreed American doctors also must make the change-over. And after several delays, federal officials have said the Oct. 1 date now is set in stone.