I have never used a billing service before. From my perspective, by the time one goes about inputting the demographics, the ICD-9 codes and CPT codes, 90% of the work is done!!! Why would I want to pay so much money (5-8% of billable) for someone else to do the 10% of work that is left over?
Posting and sending out bills is a pain in the [censored] but nobody does it better than my wife who runs the business!!