But this arrangement potentially poses a big threat to Medicare and to the new world of medical care envisioned under President Barack Obama's health overhaul.
The spread of "concierge medicine," where doctors limit their practice to patients who pay a fee of about $1,500 a year, could drive a wedge among the insured. Eventually, people unable to afford the retainer might find themselves stuck on a lower tier, facing less time with doctors and longer waits.
Medicare recipients, who account for a big share of patients in doctors' offices, are the most vulnerable. The program's financial troubles are causing doctors to reassess their participation. But the impact could be broader because primary care doctors are in short supply and the health law will bring in more than 30 million newly insured patients.
If concierge medicine goes beyond just a thriving niche, it could lead to a kind of insurance caste system.
"What we are looking at is the prospect of a more explicitly tiered system where people with money have a different kind of insurance relationship than most of the middle class, and where Medicare is no longer as universal as we would like it to be," said John Rother, policy director for AARP. read more:
