Table 1. Characteristics of Private Payer Data Sources: 1993.

Payer		Months of Data	Total Physician Services (Millions)	Total Payments (Millions of Dollars)
Payer 1	PPO	3	3.8	$195.8
	Indemnity	3	11.3	771.2
Payer 2	PPO	12	13.6	812.3
	Indemnity	12	5.8	377.5

NOTE: PPO is preferred provider organization.

SOURCE: Urban Institute analysis of 1993 claims from two large private payers.