Table 3. Number of enrollees and percent distribution in the 20 largest health maintenance organizations (HMO's) and the percent of Medicare Tax Equity and Fiscal Responsibility Act (TEFRA) of 1982 risk enrollees and rank: June 1986.

Name of HMO		Total number of HMO enrollees June 19861	Percent distribution	Percent Medicare TEFRA risk enrollees June 1986	Rank among Medicare TEFRA risk December 19862
Total		323,663,626	100.0	2.7	—
Top 20		9,263,310	39.2	(4)	—
1.	Kaiser Foundation Health Plan—Oakland	1,997,207	8.4	(4)	(4)
2.	Kaiser Foundation Health Plan—Pasadena	1,841,806	7.8	(4)	(4)
3.	Health Insurance Plan—Greater New York	902,934	3.8	(4)	(4)
4.	Health Net—Van Nuys, California	443,860	1.9	(4)	(4)
5.	HMO of Pennsylvania—Blue Bell	412,012	1.7	3.2	8
6.	CIGNA Healthplans of California—Glendale	395,386	1.7	(4)	(4)
7.	Physicians Health Plan of Minnesota	330,758	1.4	9.3	4
8.	Group Health Corporation of Puget Sound	325,289	1.4	(4)	(4)
9.	Maxicare—South California	298,182	1.3	3.2	22
10.	Kaiser Foundation Health Plan of Northwest Oregon	289,197	1.2	5.0	9
11.	Medcenters Health Plan—St. Louis Park—Minnesota	238,033	1.0	5.9	10
12.	HMO Illinois—Chicago	226,045	1.0	1.6	(4)
13.	HMO of New Jersey—Paramus	219,884	0.9	2.4	18
14.	Harvard Community Health Plan	218,534	0.9	1.6	51
15.	Group Health—Minnesota/St. Paul	209,198	0.9	3.4	20
16.	CIGNA Health Plan of Arizona	201,724	0.8	(4)	(4)
17.	Health Alliance Plan of Michigan	189,302	0.8	(4)	(4)
18.	Compcare Health Services Insurance Corporation—Wisconsin	181,500	0.8	(4)	(4)
19.	International Medical Centers—Miami	180,360	0.8	74.8	1
20.	Kaiser Foundation Health Plan of Colorado—Denver	162,099	0.7	0.6	30
All others		14,400,316	60.8	—	—

¹InterStudy: 1986 June Update. A mid-year report on HMO growth.

²Health Care Financing Administration: Data from the Office of Prepaid Health Care.

³Includes 49,361 persons enrolled in 3 plans on Guam.

⁴No TEFRA risk enrollees.